The present invention relates to isolators and, in particular, to protection circuits for isolators that guard against common mode transients.
Isolators are devices that exchange data signals between two galvanically isolated circuit systems. The circuit systems each operate in different voltage domains, which may include different source potentials and different grounds. Isolation devices may provide data exchange across an isolation barrier, which maintains the galvanic isolation. Typical isolation devices include micro-transformers, capacitors, and magneto-resistors.
Many isolator devices are differentially-driven. That is, signal content (“VSIG”) is represented in a pair of signals that deviate differentially about a common mode voltage (“VCM”). A first signal may deviate from the common mode voltage VCM by an amount VSIG (e.g., V1=VCM+VSIG) and a second signal may deviate from the common mode voltage VCM by the same amount ΔV but in complementary fashion (e.g., V2=VCM−VSIG). In this example, the VSIG value represents signal content. Isolator circuitry often is designed using the common mode voltage VCM as a design factor to transmit and/or receive these differentially-driven signals representing signal content.
Isolator devices often are used in noisy environments. They may be subject to electro-magnetic transients that cause signal corruption in the signals that are transmitted and received by such systems. Some transients cause deviation in the common mode of the signals being transmitted by the system. Thus, where a differential signal pair ideally would deviate from the common mode in differential fashion, a common mode transient may cause the differential signals to vary together in a manner that interferes with operation of the isolator (e.g., V1=VCM+VEMI+VSIG, V2=VCM+VEMI−VSIG). Some transients may cause these signals to exceed the supply voltages (VDD or ground) of the circuitry that receive and decode the signals, which can lead to the signals being decoded incorrectly.
The inventors perceive a need in the art for an isolator system that protects against common mode transients in operation.
Embodiments of the present invention provide an isolator system having an isolator that generates differential isolator signals and a receiver that generates digital data representative of signals received from the isolator. The system also may include an RC filter coupled between the isolator and the receiver. During operation, the filter may distribute transient signals across various circuit paths in the isolator, only some of which are coupled to the receiver inputs. Over time, the filter may attenuate transient contributions at the receiver inputs. In this manner, the filter may limit effects of these common mode transients.
The system 100 may be provided for communication of digital data from the first voltage domain to the second voltage domain. In such an embodiment, the transmitter 110 may receive an input signal that takes one of two binary voltage levels. The transmitter 110 may generate an output signal having a state that is determined from the state of the input signal. The output signal may be carried by the isolator 120 from the first voltage domain to the second voltage domain across the isolation barrier 150. The receiver 140 may receive signals from the isolator 120 (which may be filtered as discussed herein) and generate a digital output signal therefrom.
Data may be transmitted across the isolator 120 by any of a variety of techniques, including, for example, on-off keying, pulse count modulation, pulse polarity modulation, and the like. In on-off keying, if the input signal corresponds to a binary value of “1,” the transmitter 110 may generate a periodic signal at its output; but, if the input signal corresponds to a binary value of “0,” the transmitter 110 may output an inert signal (no activity). Pulse count modulation may involve transmission of a single pulse signal to represent a first binary value (e.g., a digital “0”) and a multi-pulse signal to represent a second binary value (a digital “1”). Pulse polarity modulation may involve transmission of a pulse with a first polarity to represent a first binary value (e.g., a positive pulse to represent a digital “1”) and a pulse with a second polarity to represent a second binary value (e.g., a negative pulse to represent a digital “0”). The principles of the present invention find application with any differentially driven isolator structure.
A variety of isolator devices may be employed as the isolator 120, including micro-transformer-based isolators, capacitive isolators and/or magneto-resistive isolators.
First terminals of the first stage resistors R1.1, R1.2 may be coupled to respective terminals of the isolator, shown as nodes N1.1 and N1.2. Second terminals of the first stage resistors R1.1, R2.1 may be connected to ground.
First terminals of the input capacitors C1.1, C1.2 also may be coupled to respective terminals of the isolator at nodes N1.1 and N1.2. Second terminals of the input capacitors C1.1, C1.2 may be connected to first terminals of respective second stage resistors R2.1, R2.2 at nodes N2.1 and N2.2. Second terminals of the second stage resistors may be connected to each other and to capacitor C2 and the third stage resistors R3.1, R3.2.
The third stage resistors R3.1, R3.2 may be connected in series between voltage supplies VDD and ground GND. A first terminal of the capacitor C2 may be connected to an intermediate node NM between the third stage resistors R3.1 and R3.2, and a second terminal of the capacitor C2 may be connected to ground GND. The resistors R3.1 and R3.2 may have equal resistances, which may hold a voltage across the capacitor C2 at a common mode level of ½VDD, in the absence of transients.
In the example of
The capacitance of capacitor C2 may be larger than the capacitance of capacitors C1.1 and C1.2. For example, the capacitance of C2 may be 6 to 10 times larger than that of capacitors C1.1 and C1.2.
During operation, the isolator may present a differential input voltage to the filter at nodes N1.1, N1.2. That is, in ideal operating conditions, the voltage presented at node N1.1 would be centered about a common mode voltage and would vary inversely with the voltage presented at N1.2, which also is centered about the common mode voltage. The common mode voltage would not vary during ideal operating conditions.
Operating conditions, however, can induce transients at the isolator that cause the common mode voltage to deviate from its ideal value. Such transients can cause the common mode voltage to exceed the high supply voltage VDD or fall lower than ground. Transients in excess of VDD or lower than ground, if input to the receiver 140 (
The embodiment of
At the onset of the transient current pulse, the current ICM may be split between the first stage resistors R1.1, R1.2 and the second stage resistors R2.1, R2.2. Mathematically, these currents may be represented as:
where
IR1.1 and IR1.2 respectively represent currents through resistors R1.1 and R1.2, and IR2.1 and IR2.2, respectively, represent currents through resistors R2.1 and R2.2.
In the voltage domain, voltages V1.1, V1.2 at nodes N1.1 and N1.2 may be shifted from their common mode voltage (ground) to:
V1.1=V1.2=ICM(R1.1∥R2.1),
where R1.1∥R2.1 represents an effective impedance presented by a parallel connection of resistors R1.1 and R2.1. Thus, in graph 3(b), voltages V1.1 and V1.2 are illustrated as transitioning to this level at time t0.
Similarly, voltages V2.1, V2.2 at nodes N2.1 and N2.2 may be shifted from their common mode voltage (½VDD) to:
Thus, in graph 3(c), voltages V2.1 and V2.2 are illustrated as transitioning to this level at time t0.
If the current transient has a long enough duration, then the capacitors C1.1, C1.2 may present impedance to the transient current pulse ICM. Coupled with the first and second stage resistors R1.1, R1.2, R2.1 and R2.2, the capacitors C1.1, C1.2 form an RC network with a time constant:
T=C1.1·(R1.1+R2.1).
Thus, graph 3(b) illustrates voltages V1.1 and V1.2 transitioning toward a voltage V=ICM·R1.1 at a rate determined by the time constant τ.
Similarly, if the current transient has a long enough duration, then the capacitors C1.1, C1.2 and C2 behave as an RC network with the second and third stage resistors R2.1, R2.2, R3.1 and R3.2. Voltages V2.1 and V2.2, at nodes N2.1 and N2.1, may decay from their shifted value to an intermediate value given by:
Thus, graph 3(c) illustrates the voltages V2.1 and V2.2 decaying to this level following the initial shift at time t0. As shown in above equation, when C2 is 6 to 10 times larger than C1.1 and C1.2, it can reduce the voltage variations caused by the common mode current ICM.
At node NM, the capacitor C2 may be modeled as receiving a current pulse through both of the second stage resistors R2.1 and R2.2. It may receive a current pulse having the form:
The voltage at node NM, therefore, may have a peak of:
The transient current ICM is illustrated as terminating instantly at time t1. The filter 200 may respond in a complementary fashion to the transition illustrated at time t0. That is, the voltages V1.1, V1.2 may be shifted from its voltage V1.1=V1.2=ICM*R1.1 by an amount represented by ΔV1.1=ΔV1.2=−ICM(R2.1∥R2.2), then may transition toward zero according to the time constant τ. Similarly, the voltages V2.1, V2.2 may be shifted from the voltages
by an amount ΔV2.1=ΔV2.2=−ICM(R2.1∥R2.2). After these initial transitions, the voltages V1.1, V1.2, V2.1 and V2.2 may transition to steady state voltages represented by their ordinary common mode values of ground and VDD, respectively.
As indicated, the graphs of
Returning to
During circuit design, circuit designers may estimate characteristics of voltage transients that are expected to be encountered by the filter 200 (
From this estimate, the circuit designers may estimate a maximum ICM that may be induced by those transients. Circuit designers then may select resistance values according to a design rule:
In practice, a variety of resistance values may satisfy this design rule. Accordingly, circuit designers have opportunities to select resistance values that satisfy other design objectives, such as power consumption and coupling behavior of the isolator.
and rise at a slew rate represented by
As illustrated in
where dt represents the duration of the common mode transient. Therefore, in certain circumstances, the length of the common mode transient may be sufficient to cause the voltage at nodes NRX1, NRX2 to exceed the supply voltages of the receiver.
Thus, as shown above, the embodiment of
Several embodiments of the invention are specifically illustrated and/or described herein. However, it will be appreciated that modifications and variations of the invention are covered by the above teachings and within the purview of the appended claims without departing from the spirit and intended scope of the invention. Further variations are permissible that are consistent with the principles described above.
Number | Name | Date | Kind |
---|---|---|---|
3058078 | Hoh | Oct 1962 | A |
3537022 | Regan | Oct 1970 | A |
3714540 | Galloway | Jan 1973 | A |
3760198 | Mori et al. | Sep 1973 | A |
3798608 | Huebner | Mar 1974 | A |
3808673 | Bottini | May 1974 | A |
4024452 | Seidel | May 1977 | A |
4027152 | Brown et al. | May 1977 | A |
4035710 | Joyce | Jul 1977 | A |
4065713 | Pollmeier | Dec 1977 | A |
4118603 | Kumhyr | Oct 1978 | A |
4159431 | Roozenbeek et al. | Jun 1979 | A |
4227045 | Chelcun et al. | Oct 1980 | A |
4275404 | Cassiday et al. | Jun 1981 | A |
4302807 | Mentler | Nov 1981 | A |
4318170 | Cabalfin | Mar 1982 | A |
4321487 | Huykman | Mar 1982 | A |
4352998 | Baker et al. | Oct 1982 | A |
4443839 | Onodera et al. | Apr 1984 | A |
4475149 | Gallios | Oct 1984 | A |
4538136 | Drabing | Aug 1985 | A |
4547961 | Bokil et al. | Oct 1985 | A |
4554462 | Komiya et al. | Nov 1985 | A |
4564768 | Komiya et al. | Jan 1986 | A |
4660014 | Wenaas et al. | Apr 1987 | A |
4703283 | Samuels | Oct 1987 | A |
4712170 | Grace | Dec 1987 | A |
4720667 | Lee et al. | Jan 1988 | A |
4748419 | Somerville | May 1988 | A |
4780795 | Meinel | Oct 1988 | A |
4785345 | Rawls et al. | Nov 1988 | A |
4817865 | Wray | Apr 1989 | A |
4818855 | Mongeon et al. | Apr 1989 | A |
4825450 | Herzog | Apr 1989 | A |
4835486 | Somerville | May 1989 | A |
4845466 | Hariton et al. | Jul 1989 | A |
4859877 | Cooperman et al. | Aug 1989 | A |
4864589 | Endo | Sep 1989 | A |
4885582 | LaBarge et al. | Dec 1989 | A |
4912617 | Hartmann et al. | Mar 1990 | A |
4920474 | Bruning et al. | Apr 1990 | A |
4922883 | Iwasaki | May 1990 | A |
4924210 | Matsui et al. | May 1990 | A |
4937468 | Shekhawat et al. | Jun 1990 | A |
4945264 | Lee et al. | Jul 1990 | A |
4959631 | Hasegawa et al. | Sep 1990 | A |
5041780 | Rippel | Aug 1991 | A |
5057968 | Morrison | Oct 1991 | A |
5095357 | Andoh et al. | Mar 1992 | A |
5102040 | Harvey | Apr 1992 | A |
5128729 | Alonas et al. | Jul 1992 | A |
5136455 | Billingsley | Aug 1992 | A |
5142432 | Schneider | Aug 1992 | A |
5164621 | Miyamoto | Nov 1992 | A |
5204551 | Bjornholt | Apr 1993 | A |
5235425 | Oh | Aug 1993 | A |
5260967 | Schilling | Nov 1993 | A |
5270882 | Jove et al. | Dec 1993 | A |
5293400 | Monod et al. | Mar 1994 | A |
5300896 | Suesserman | Apr 1994 | A |
5325355 | Oprescu et al. | Jun 1994 | A |
5327030 | DeVito et al. | Jul 1994 | A |
5329225 | Roshen et al. | Jul 1994 | A |
5334882 | Ting | Aug 1994 | A |
5339061 | Reick | Aug 1994 | A |
5353001 | Meinel et al. | Oct 1994 | A |
5369666 | Folwell et al. | Nov 1994 | A |
5384808 | Van Brunt et al. | Jan 1995 | A |
5394319 | Attwood et al. | Feb 1995 | A |
5396394 | Gee | Mar 1995 | A |
5430641 | Kates | Jul 1995 | A |
5450305 | Boys et al. | Sep 1995 | A |
5467607 | Harvey | Nov 1995 | A |
5469098 | Johnson, Jr. | Nov 1995 | A |
5475579 | John et al. | Dec 1995 | A |
5484012 | Hiratsuka | Jan 1996 | A |
5488627 | Hardin et al. | Jan 1996 | A |
5533054 | DeAndrea et al. | Jul 1996 | A |
5539241 | Abidi et al. | Jul 1996 | A |
5539598 | Denison et al. | Jul 1996 | A |
5572179 | Ito et al. | Nov 1996 | A |
5588021 | Hunt et al. | Dec 1996 | A |
5596466 | Ochi | Jan 1997 | A |
5631920 | Hardin | May 1997 | A |
5636110 | Lanni | Jun 1997 | A |
5650357 | Dobkin et al. | Jul 1997 | A |
5663768 | Yang | Sep 1997 | A |
5701037 | Weber et al. | Dec 1997 | A |
5714938 | Schwabl | Feb 1998 | A |
5716323 | Lee | Feb 1998 | A |
5731954 | Cheon | Mar 1998 | A |
5757338 | Bassetti et al. | May 1998 | A |
5774350 | Notaro et al. | Jun 1998 | A |
5774791 | Strohallen et al. | Jun 1998 | A |
5781071 | Kusunoki | Jul 1998 | A |
5781077 | Leitch et al. | Jul 1998 | A |
5786979 | Douglass | Jul 1998 | A |
5801602 | Fawal et al. | Sep 1998 | A |
5812598 | Sharma et al. | Sep 1998 | A |
5825259 | Harpham | Oct 1998 | A |
5831426 | Black, Jr. et al. | Nov 1998 | A |
5831525 | Harvey | Nov 1998 | A |
5877667 | Wollesen | Mar 1999 | A |
5900683 | Rinehart et al. | May 1999 | A |
5900764 | Imam et al. | May 1999 | A |
5907481 | Svardsjo | May 1999 | A |
5910780 | Tam | Jun 1999 | A |
5913817 | Lee | Jun 1999 | A |
5926358 | Dobkin et al. | Jul 1999 | A |
5942937 | Bell | Aug 1999 | A |
5952849 | Haigh | Sep 1999 | A |
5959482 | Fattori et al. | Sep 1999 | A |
5969590 | Gutierrez | Oct 1999 | A |
5990753 | Danstrom et al. | Nov 1999 | A |
5998979 | Nilsson | Dec 1999 | A |
6000128 | Umeno et al. | Dec 1999 | A |
6016050 | Brokaw | Jan 2000 | A |
6025705 | Nguyen et al. | Feb 2000 | A |
6038276 | Dinh | Mar 2000 | A |
6040986 | Sakamoto et al. | Mar 2000 | A |
6049258 | Fawal et al. | Apr 2000 | A |
6054780 | Haigh et al. | Apr 2000 | A |
6069802 | Priegnitz | May 2000 | A |
6087882 | Chen et al. | Jul 2000 | A |
6104003 | Jones | Aug 2000 | A |
6124756 | Yaklin et al. | Sep 2000 | A |
6208174 | Hopkins | Mar 2001 | B1 |
6208531 | Vinciarelli et al. | Mar 2001 | B1 |
6229346 | Milanese et al. | May 2001 | B1 |
6249171 | Yaklin et al. | Jun 2001 | B1 |
6255863 | Yamauchi et al. | Jul 2001 | B1 |
6262600 | Haigh et al. | Jul 2001 | B1 |
6266254 | Ohtake | Jul 2001 | B1 |
6291907 | Haigh et al. | Sep 2001 | B1 |
6300617 | Daughton et al. | Oct 2001 | B1 |
6304109 | Brokaw | Oct 2001 | B1 |
6317338 | Boys | Nov 2001 | B1 |
6344979 | Huang et al. | Feb 2002 | B1 |
6359983 | Krone et al. | Mar 2002 | B1 |
6377313 | Yang et al. | Apr 2002 | B1 |
6377646 | Sha | Apr 2002 | B1 |
6389063 | Kanekawa et al. | May 2002 | B1 |
6400227 | Goldfarb et al. | Jun 2002 | B1 |
6420992 | Richmond | Jul 2002 | B1 |
6449318 | Rumbaugh | Sep 2002 | B1 |
6501363 | Hwu et al. | Dec 2002 | B1 |
6504732 | Abe | Jan 2003 | B2 |
6525566 | Haigh et al. | Feb 2003 | B2 |
6538532 | Petrovic | Mar 2003 | B2 |
6542385 | Emmons et al. | Apr 2003 | B1 |
6553057 | Sha et al. | Apr 2003 | B1 |
6556075 | Jordan | Apr 2003 | B1 |
6570522 | Galambos et al. | May 2003 | B1 |
6573940 | Yang | Jun 2003 | B1 |
6603383 | Gevorgian et al. | Aug 2003 | B2 |
6603807 | Yukutake et al. | Aug 2003 | B1 |
6606260 | Ahlstrom | Aug 2003 | B2 |
6611051 | Akiyama et al. | Aug 2003 | B2 |
6621365 | Hallivuori et al. | Sep 2003 | B1 |
6686768 | Comer | Feb 2004 | B2 |
6693458 | Barrow | Feb 2004 | B1 |
6720816 | Strzalkowski | Apr 2004 | B2 |
6728320 | Khasnis et al. | Apr 2004 | B1 |
6738240 | Ahn et al. | May 2004 | B1 |
6747421 | Kohn | Jun 2004 | B2 |
6765809 | Komori | Jul 2004 | B2 |
6807070 | Ribarich | Oct 2004 | B2 |
6819169 | Kunc | Nov 2004 | B1 |
6833875 | Yang et al. | Dec 2004 | B1 |
6873065 | Haigh et al. | Mar 2005 | B2 |
6903578 | Haigh et al. | Jun 2005 | B2 |
6911848 | Vinciarelli | Jun 2005 | B2 |
6911860 | Wang et al. | Jun 2005 | B1 |
6922080 | Haigh et al. | Jul 2005 | B2 |
6927662 | Kahlmann et al. | Aug 2005 | B2 |
6972803 | Seth-Smith et al. | Dec 2005 | B2 |
6977522 | Murabayashi et al. | Dec 2005 | B1 |
6993087 | Rosnell et al. | Jan 2006 | B2 |
7010621 | Calkins et al. | Mar 2006 | B2 |
7016490 | Beutler et al. | Mar 2006 | B2 |
7061189 | Newman, Jr. et al. | Jun 2006 | B2 |
7075329 | Chen et al. | Jul 2006 | B2 |
7098766 | Gardner et al. | Aug 2006 | B2 |
7102388 | Murabayashi et al. | Sep 2006 | B2 |
7113750 | Eastwood | Sep 2006 | B2 |
7116183 | Wu | Oct 2006 | B2 |
7167213 | Murdock et al. | Jan 2007 | B1 |
7171739 | Yang et al. | Feb 2007 | B2 |
7199562 | Muterspaugh | Apr 2007 | B2 |
7227585 | Murdock et al. | Jun 2007 | B1 |
7253565 | Kang et al. | Aug 2007 | B2 |
7277491 | Dong et al. | Oct 2007 | B2 |
7334417 | Tokushige et al. | Feb 2008 | B2 |
7376212 | Dupuis | May 2008 | B2 |
7477676 | Kokubo et al. | Jan 2009 | B2 |
7489526 | Chen et al. | Feb 2009 | B2 |
7545059 | Chen et al. | Jun 2009 | B2 |
7548440 | Chen et al. | Jun 2009 | B2 |
7558080 | Chen et al. | Jul 2009 | B2 |
7613016 | Chen et al. | Nov 2009 | B2 |
7659775 | He et al. | Feb 2010 | B2 |
7671372 | Morikawa | Mar 2010 | B2 |
7683654 | Chen et al. | Mar 2010 | B2 |
7692444 | Chen et al. | Apr 2010 | B2 |
7701375 | Cosand | Apr 2010 | B1 |
7706154 | Chen et al. | Apr 2010 | B2 |
7719305 | Chen | May 2010 | B2 |
7741896 | Chow | Jun 2010 | B2 |
7881461 | Skov et al. | Feb 2011 | B2 |
7902627 | Dong et al. | Mar 2011 | B2 |
7919781 | Wang et al. | Apr 2011 | B2 |
7920010 | Chen, Jr. et al. | Apr 2011 | B2 |
7923710 | Crawley et al. | Apr 2011 | B2 |
8084894 | Chen | Dec 2011 | B2 |
8116055 | Baumgartner et al. | Feb 2012 | B2 |
8169108 | Dupuis et al. | May 2012 | B2 |
8364195 | Spina et al. | Jan 2013 | B2 |
8428539 | Dupuis | Apr 2013 | B2 |
8502584 | Zhiwei et al. | Aug 2013 | B1 |
8618787 | Quinn | Dec 2013 | B1 |
8693528 | Shrestha et al. | Apr 2014 | B1 |
8693557 | Zhang | Apr 2014 | B1 |
8724355 | Pinkhasov et al. | May 2014 | B1 |
8736343 | Chen et al. | May 2014 | B2 |
8867592 | Shrestha | Oct 2014 | B2 |
9319256 | Park et al. | Apr 2016 | B2 |
9473329 | Edwards | Oct 2016 | B1 |
9660848 | Yun et al. | May 2017 | B2 |
20030042571 | Chen et al. | Mar 2003 | A1 |
20030052712 | Comer | Mar 2003 | A1 |
20030075990 | Guitton et al. | Apr 2003 | A1 |
20030107411 | Martin et al. | Jun 2003 | A1 |
20030163748 | Calkins et al. | Aug 2003 | A1 |
20040076221 | Refaeli et al. | Apr 2004 | A1 |
20040184289 | Vinciarelli | Sep 2004 | A1 |
20040207763 | Ciardi | Oct 2004 | A1 |
20050008113 | Kokubo et al. | Jan 2005 | A1 |
20050033902 | Tamura | Feb 2005 | A1 |
20050047511 | Dosho et al. | Mar 2005 | A1 |
20050272378 | Dupuis | Dec 2005 | A1 |
20050288739 | Hassler et al. | Dec 2005 | A1 |
20060039169 | Chen et al. | Feb 2006 | A1 |
20060109918 | Brown | May 2006 | A1 |
20060120115 | Chen et al. | Jun 2006 | A1 |
20060202721 | Partow et al. | Sep 2006 | A1 |
20070052399 | Chen et al. | Mar 2007 | A1 |
20070052514 | Chen et al. | Mar 2007 | A1 |
20070097263 | Kim | May 2007 | A1 |
20070133144 | Lewis | Jun 2007 | A1 |
20070258513 | Strzalkowski | Nov 2007 | A1 |
20080055190 | Lee | Mar 2008 | A1 |
20080094046 | Chen et al. | Apr 2008 | A1 |
20080279288 | Crawley | Nov 2008 | A1 |
20080311862 | Spina et al. | Dec 2008 | A1 |
20080315925 | Alfano et al. | Dec 2008 | A1 |
20090028320 | Fuehrer | Jan 2009 | A1 |
20090168462 | Schopfer et al. | Jul 2009 | A1 |
20090184754 | Chen | Jul 2009 | A1 |
20090195082 | Chen | Aug 2009 | A1 |
20090206960 | Ng | Aug 2009 | A1 |
20100052430 | Takaishi et al. | Mar 2010 | A1 |
20100054345 | Yamamoto | Mar 2010 | A1 |
20100106041 | Ghovanloo et al. | Apr 2010 | A1 |
20100111218 | Chen, Jr. | May 2010 | A1 |
20100329364 | Giombanco et al. | Dec 2010 | A1 |
20110028104 | Giombanco | Feb 2011 | A1 |
20110248787 | Jiang | Oct 2011 | A1 |
20120025921 | Yang et al. | Feb 2012 | A1 |
20120074990 | Sornin | Mar 2012 | A1 |
20120112822 | Marshall | May 2012 | A1 |
20120212251 | Yanagishima et al. | Aug 2012 | A1 |
20130002366 | Sabut et al. | Jan 2013 | A1 |
20130106515 | Lin | May 2013 | A1 |
20130285465 | Takeda et al. | Oct 2013 | A1 |
20130301690 | Shrestha | Nov 2013 | A1 |
20140062527 | Mills et al. | Mar 2014 | A1 |
20140091954 | Zhu et al. | Apr 2014 | A1 |
20140169038 | Kamath et al. | Jun 2014 | A1 |
20140286446 | Takeda et al. | Sep 2014 | A1 |
20150110224 | Kang et al. | Apr 2015 | A1 |
20150222241 | Brudermann | Aug 2015 | A1 |
20150236698 | Pedersen | Aug 2015 | A1 |
20150256369 | Park et al. | Sep 2015 | A1 |
20160080181 | Yun et al. | Mar 2016 | A1 |
20160080183 | Yun | Mar 2016 | A1 |
20160087914 | Goswami | Mar 2016 | A1 |
20160126724 | Yun | May 2016 | A1 |
Number | Date | Country |
---|---|---|
101681901 | Mar 2010 | CN |
201976007 | Sep 2011 | CN |
102307003 | Jan 2012 | CN |
102437849 | May 2012 | CN |
102484449 | May 2012 | CN |
103580607 | Feb 2014 | CN |
103607201 | Feb 2014 | CN |
101877683 | Aug 2014 | CN |
104852727 | Aug 2015 | CN |
2529296 | Jan 1977 | DE |
19718420 | Nov 1998 | DE |
19922129 | Sep 2000 | DE |
19922123 | Nov 2000 | DE |
19922127 | Nov 2000 | DE |
19922128 | Jan 2001 | DE |
10100282 | Jul 2002 | DE |
102009039414 | Apr 2010 | DE |
0282102 | Sep 1988 | EP |
0307345 | Mar 1989 | EP |
0586062 | Mar 1994 | EP |
0708529 | Apr 1996 | EP |
0 913 947 | May 1999 | EP |
0917309 | May 1999 | EP |
0977406 | Feb 2000 | EP |
1 168 804 | Jan 2002 | EP |
1171980 | Jan 2002 | EP |
1209791 | May 2002 | EP |
1 753 129 | Feb 2007 | EP |
1 990 914 | Nov 2008 | EP |
2 280 488 | Feb 2011 | EP |
2282405 | Feb 2011 | EP |
1550194 | Nov 2012 | EP |
2 645 589 | Oct 2013 | EP |
3 002 875 | Apr 2016 | EP |
2679670 | Jan 1993 | FR |
2173956 | Oct 1986 | GB |
S57132460 | Aug 1982 | JP |
S58215833 | Dec 1983 | JP |
H07115768 | May 1995 | JP |
H0937558 | Feb 1997 | JP |
H10178398 | Jun 1998 | JP |
H10191654 | Jul 1998 | JP |
2002508916 | Mar 2002 | JP |
2002-118605 | Apr 2002 | JP |
2002262545 | Sep 2002 | JP |
2010-088112 | Apr 2010 | JP |
2011134347 | Jul 2011 | JP |
200635245 | Oct 2006 | TW |
WO 8100658 | Mar 1981 | WO |
WO 9505033 | Feb 1995 | WO |
WO 9520768 | Aug 1995 | WO |
WO 97-17763 | May 1997 | WO |
WO 9837672 | Aug 1998 | WO |
WO 9848541 | Oct 1998 | WO |
WO 9921332 | Apr 1999 | WO |
WO 0128094 | Apr 2001 | WO |
WO 0161951 | Aug 2001 | WO |
WO 02073914 | Sep 2002 | WO |
WO 02086969 | Oct 2002 | WO |
WO 2004-100473 | Nov 2004 | WO |
WO 200586062 | Sep 2005 | WO |
WO 2012036014 | Mar 2012 | WO |
WO 2012085951 | Jun 2012 | WO |
2014036594 | Mar 2014 | WO |
Entry |
---|
Office communication dated Oct. 7, 2016 for Application No. JP 2015-215569. |
German Examination Report dated Jun. 21, 2017 and partial English translation thereof in connection with German Application No. 102015118514.8. |
Partial European Search Report dated Feb. 9, 2016, in European Application No. 15183918.0. |
Extended European Search Report dated Jul. 1, 2016 in connection with European Application No. 15183918.0. |
Partial European Search Report dated Feb. 9, 2016, in European Application No. 15183914.9. |
Extended European Search Report dated May 23, 2016 for Application No. EP 15183914.9. |
Extended European Search Report dated Feb. 16, 2017 in connection with European Application No. 16154322.8. |
Der et al. “A Switched-Capacitor Differencing Circuit with Common-Mode Rejection for Fully Differential Comparators,” Proceedings of the 36th Midwest Symposium on Circuits and Systems, Aug. 1993, vol. 2, pp. 911-914. |
Gupta et al., “Asymmetric Cross-Coupled Differential Pair Confirguration to Realize Neuron Activation Function and Its Derivative”, IEEE Transactions on Circuits and Systems II: Express Briefs, vol. 52, No. 1, Jan. 2005, pp. 10-13. cited by applicant. |
“IEEE Standard for a High Performance Serial Bus”, IEEE Std 1394-1995, Microprocessor and Microcomputer Standards Committee, 1996, pp. i-viii, pp. 1-384, no month. |
Akiyama et al., “A High-Voltage Monolithic Isolator for a Communication Network Interface,” IEEE Transactions on Electron Devices, vol. 49, No. 5, May 2002, pp. 895-901. |
All About Circuits, “An Electric Pendulum”, Textbook, vol. II—Alternating Circuit (AC), Chapter 6: Resonance, allaboutcircuits.com, Jul. 12, 2004, 5 pages. |
Analog Devices, “Frequently Asked Questions: Isolation, iCoupler Technology, and iCoupler Products”, Mar. 2006, 10 pages. |
Analog Devices, “High Precision, Low Offset, mV Input Isolation Amplifier,” AD208 datasheet, 16 pages, no date. |
Analog Devices, “High Speed Digital Isolators”, ADuM1100AR / ADuM1100BR datasheet, Rev. 0, 2001, 12 pages, no month. |
Analog Devices, “High Speed, Logic Isolator With Power Transformer”, AD260 datasheet, Rev. 0, Sep. 1998, 8 pages. |
Analog Devices, “iCoupler Digital Isolation Products”, 2005, 12 pages, no month. |
Analog Devices, “iCoupler Isolation in RS-232 Applications”, Application Note AN-740, Rev. 0, Jul. 2004, 8 pages. |
Analog Devices, “iCoupler Isolation in RS-485 Applications”, Application Note AN-727, Rev. 0, Jun. 2004, 12 pages. |
Analog Devices, “Low Cost, Miniature Isolation Amplifiers”, AD202 / AD204 datasheet, Rev. B, 1994, 12 pages, no month. |
Analog Devices, “Precision, Wide Bandwidth 3-Port Isolation Amplifier”, AD210 datasheet, Rev. A, 8 pages, no date. |
Analog Devices, “Rugged, Military Temperature Range, 10 kHz Bandwidth Isolation Amplifier”, AD203SN datasheet, Rev. A, 12 pages, no date. |
Avago Technologies, “Dual-Channel High Speed 15 MBd CMOS Optocoupler”, QCPL-073H datasheet, Jul. 2007, 10 pages. |
Avago Technologies, “Single-Channel High Speed 15 MBd CMOS Optocoupler” QCPL-070H datasheet, Jul. 2007, 10 pages. |
Banerjee and Kliger, “Micromachined Magnetics: a New Step in the Evolution of Isolation Technology”, Electronic Engineering, Jun. 2000, pp. 27-32. |
Baumann, “Free-Running Bridge Inverter”, IBM Technical Disclosure Bulletin, vol. 9, No. 10, Mar. 1967, p. 1462. |
Bourgeois, “PCB Based Transformer for Power MOSFET Drive”, IEEE, 1994, pp. 238-244. |
Burr-Brown, “Dual, Isolated, Bi-Directional Digital Coupler”, IS0150 datasheet, 3 versions, 1993-2007, 38 pages, no month. |
Business Wire, “Emerson Selects Analog Devices' Digital Isolation Technology for Industrial Systems; ADI's iCoupler Technology Enables Low-Cost Signal Isolation in High-Temperature Environments”, Sep. 24, 2003, 2 pages. |
Business Wire, “Pulse's New Miniature Transformers are Optimized for Wideband RF Applications”, Jul. 26, 2000, 2 pages. |
Chang et al., “A Spread-Spectrum Clock Generator with Triangular Modulation”, IEEE Journal of Solid-State Circuits, vol. 38, No. 4, Apr. 2003, pp. 673-676. |
Chen et al., “High Speed Digital Isolators Using Microscale On-Chip Transformers”, Elektronik, Jul. 22, 2003, English version, 6 pages. |
Chiu et al., “Thin-Film Inductive Heads”, IBM J. Res. Develop., vol. 40, No. 3, May 1996, pp. 283-300. |
Christiansen, “Pulse-Code Modulation (PCM)”, Electronics Engineers' Handbook, Fourth Edition, McGraw-Hill, Inc., 1996, 3 pages (unnumbered), no month. |
Chu et al., “High-Voltage CMOS Decoder/Driver for Plasma Displays”, 1976 IEEE International Solid-State Circuits Conference (ISSCC 76), Digest of Technical Papers, vol. XIX, Feb. 1976, pp. 212-213. |
Cypress Semiconductor, “Spread Spectrum Clock Generator”, SM560 datasheet, Rev. E, Jun. 2004, 8 pages. |
Cypress Semiconductor, “Spread Spectrum Clock Generator”, SM561 datasheet, Rev. C, Dec. 2002, 8 pages. |
Dotter et al., “Implementation of an Adaptive Balancing Hybrid”, IEEE Transactions on Communications, vol. 28, No. 8, Aug. 1980, pp. 1408-1416. |
EDN Network, “Welcome to the 17th Annual EDN Innovation Awards: EDN's 2006 Innovation Awards Nominees--Nominee Detail--ADuM125xI2C Digital Isolators (Analog Devices)”, Reed Business Information, 2007, 2 pages, no month. |
EE Times Asia, “ADI Digital Isolators Reduce Per-Channel Costs”, New Products, Jun. 19, 2003, 1 page. |
EE Times Online, “EE Times Names ACE Finalists”, Latest News, Jan. 15, 2007, 3 pages. |
El-Hammanmsy, “Design of High-Efficiency RF Class-D Power Amplifier”, IEEE Transactions on Power Electronics, vol. 9, No. 3, May 1994, pp. 297-308. |
Fleming, “Isolation Amplifiers Break Ground Loops and Achieve High CMRR”, EDN, vol. 32, No. 26, Dec. 24, 1987, pp. 97-102, and p. 5. |
Gallo et al., “An Unity High Power Factor Power Supply Rectifier Using a PWM AC/DC Full Bridge Soft-Switching”, 17th Annual IEEE Applied Power Electronics Conference and Exposition (APEC 2002), Mar. 2002, pp. 1190-1194. |
Geen et al., “Miniature Multilayer Spiral Inductors for GaAs MMICs”, 11th Annual IEEE Gallium Arsenide Integrated Circuit (GaAs IC) Symposium, Oct. 22-25, 1989, Technical Digest, pp. 303-306. |
Ghiorse and Ranta, “Isolation in Medical Applications”, Power Electronics Europe, Jul. 2005, 2 pages. |
Greenhouse, “Design of Planar Rectangular Microelectronic Inductors”, IEEE Transactions on Parts, Hybrids, and Packaging, vol. 10, No. 2, Jun. 1974, pp. 101-109. |
Hermann et al., “Magnetically Coupled Linear Isolator”, IEEE Transactions on Magnetics, vol. 33, No. 5, Sep. 1997, pp. 4029-4031. |
Hewlett Packard, “40 ns Prop. Delay, SO-8 Optocoupler”, HCPL-0710 Technical Data, 16 pages. |
International Microcircuits, “Low EMI Spectrum Spread Clock”, SM530 datasheet, Rev. 1.6, Jan. 1999, 16 pages. |
Irvine, “Early Digital Computers at Bell Telephone Laboratories”, IEEE Annals of the History of Computing, Jul.-Sep. 2001, pp. 22-42. |
Jaycar Electronics, “DC-DC Converters: A Primer”, DCDCONV Reference Data Sheet, 2001, 5 pages, no month. |
Kehrer, “Design of Monolithic Integrated Lumped Transformers in Silicon-based Technologies up to 20 GHz”, Master's thesis, Technical University of Vienna, Institute of Communications and Radio-Frequency Engineering, Dec. 2000, 85 pages. cited by applicant. |
Kester, “Digital Isolation Techniques”, Practical Design Techniques for Sensor Signal Conditioning, Section 10: Hardware Design Techniques, Analog Devices, Inc., 1999, pp. 10.55- 10.57, no month. |
Kester, “Origins of Real-World Signals and Their Units of Measurement”, Mixed Signal and DSP Design Techniques, Section 1: Introduction, Newnes, 2003, pp. 1.1-1.10, no month. |
Kliger et al., “Isolation with Waferscale Transformers”, Digital Isolation, Power Electronics Europe, Issue 6, 2005, pp. 40-43, no month. |
Kliger, “Integrated Transformer-Coupled Isolation”, IEEE Instrumentation & Measurement Magazine, Mar. 2003, pp. 16-19. |
Knoedl, Jr., et al., “A Monolithic Signal Isolator”, 4th Annual IEEE Applied Power Electronics Conference and Exposition (APEC '89), Mar. 13-17, 1989, Conference Proceedings, pp. 165-170. |
Kojima et al., “2.3 kVac 100 MHz Multi-Channel Monolithic Isolator IC,” 12th International Symposium on Power Semiconductor Devices and ICs (ISPSD'2000), May 2000, pp. 309-312. |
Kojima et al., “A Novel Monolithic Isolator for a Communications Network Interface IC”, 11th Annual IEEE International ASIC Conference, Sep. 1998, pp. 255-258. |
Kuhn et al., “An RF-Based IEEE 1394 Ground Isolator Designed in a Silicon-on-Insulator Process”, 44th IEEE Midwest Symposium on Circuits and Systems (MWSCAS 2001), Aug. 2001, pp. 764-767. |
Kuisma, “Variable Frequency Switching in Power Supply EMI--Control: An Overview”, IEEE AES Systems Magazine, Dec. 2003, pp. 18-22. |
Lam et al., “High-Isolation Bonding Pad Design for Silicon RFIC up to 20 GHz”, IEEE Electron Device Letters, vol. 24, No. 9, Sep. 2003, pp. 601-603. |
Laughton et al., “Digital Control Systems”, Electrical Engineers Reference Book, Sixteenth Edition, Chapter 14, Newnes, 2003, 3 cover sheets (unnumbered), pp. 14/6-14/9, no month. |
Ledwich, “DC-DC Converter Basics”, Power Designers, 1998, www.powerdesigners.com, 11 pages, no month. |
Long et al., “A 1.9 GHz Low-Voltage Silicon Bipolar Receiver Front-End for Wireless Personal Communications Systems”, IEEE Journal of Solid-State Circuits, vol. 30, No. 12, Dec. 1995, pp. 1438-1448. |
Lu et al., A Rail-To-Rail Class-AB Amplifier With an Offset Cancellation for LCD Drivers. IEEE J Solid-State Circ. Feb. 2009; 44(2):525-37. |
Moss et al., “Integrated Circuit D-MOS Telephone Crosspoint Array,” 1976 IEEE International Solid-State Circuits Conference (ISSCC 76), Digest of Technical Papers, vol. XIX, Feb. 1976, pp. 32-33, 226. |
National Instruments, “Isolation Technologies for Reliable Industrial Measurements”, Whitepaper, 2006, 11 pages, no month. |
National Instruments, “Technologies behind NI Industrial M and S Series Data Acquisition Devices with Isolation”, NI Developer Zone, Oct. 3, 2007, 5 pages. |
Ng et al., “Optimized Geometrical Features of Monolithic Spiral RF Transformers on Silicon”, SAFE ProRISC SeSens 2001, Conference Proceedings, Nov. 2001, pp. 132-135. |
Nihtianov, “Magnetogalvanic Approach to Isolation of Analog Circuits”, IEEE Transactions on Instrumentation and Measurement, vol. 43, No. 4, Aug. 1994, pp. 677-680. |
Niknejad et al., “Analysis, Design, and Optimization of Spiral Inductors and Transformers for Si RF ICs”, IEEE Journal of Solid-State Circuits, vol. 33, No. 10, Oct. 1998, pp. 1470-1481. |
NVE Corporation, “High Speed Digital Coupler”, IL710 datasheet, Jul. 2002, 8 pages. |
NVE Corporation, “High Speed Five-Channel Digital Isolators”, IL260/1L261 datasheet, Rev. E, Apr. 2007, 11 pages. |
Park et al., “Packaging Compatible Microtransformers on a Silicon Substrate”, IEEE Transactions on Advanced Packaging, vol. 26, No. 2, May 2003, pp. 160-164. |
Pickering, “A System Designer's Guide to Isolation Devices”, Sensors, Jan. 1999, pp. 14-26 (7 pages). |
PICO Electronics, “Audio Transformers: 2 Ohm to 40K Ohm; 400 Hz to 100 KHz, 400 milliwatt at 1KHz”, datasheet, 8 pages, no date. |
PowerZONE, “ADuM1300/Jan. 1400/01/02: Multi-Channel Digital Isolators for High-Voltage Industrial Applications”, powerZONE Products for the week of May 26, 2003, 2 pages. |
PR Newswire, “Electronics Technology Elite Compete for Industry's Highest Honors as EE Times Announces Finalists for 2007 EE Times ACE Awards”, Jan. 15, 2007, 5 pages. |
Premier Devices, “Surface Mount Transformer,” XFA-0401-1U datasheet, 1 pages, no date. |
Pulse Engineering, “RF Transformers, Transformers for Wideband RF Applications”, C244.A datasheet, Oct. 2004, 2 pages. |
Ronkainen et al., “IC Compatible Planar Inductors on Silicon”, IEE Proceedings--Circuits Devices Systems, vol. 144, No. 1, Feb. 1997, pp. 29-35. |
Roth, Jr., “Clocked Flip-Flops with Clear and Preset Inputs”, Fundamentals of Logic Design, Third Edition, 1985, 2 Cover Sheets (unnumbered), pp. 254-256, no month. |
Roth, Jr., “MOS and CMOS Logic”, Fundamentals of Logic Design, Third Edition, 1985, 2 Cover Sheets (unnumbered), pp. 613-616, no month. |
Sayani et al., “Isolated Feedback for Off-Line Switching Power Supplies with Primary-Side Control”, 3rd Annual IEEE Applied Power Electronics Conference and Exposition (APEC '88), Feb. 1988, pp. 203-211 (5 pages). |
Shin et al., “A 250-Mbit/s CMOS Crosspoint Switch”, IEEE Journal of Solid-State Circuits, vol. 24, No. 2, Apr. 1989, pp. 478-486. |
Silicon Laboratories, “Global Line-Side DAA for Embedded System-Side Module,” Si306x datasheet, Rev. 0.9, Jan. 2005, 62 pages. |
Silicon Laboratories, “Highlights of the Si844x Quad Digital Isolators,” date unknown, 1 page. |
Silicon Laboratories, “Quad-Channel Digital Isolator”, Si8440/41/42/45 datasheet, Rev. 0.6, Aug. 2007, 30 pages. |
Silicon Laboratories, “Silicon Laboratories Announces Industry's Fastest, Most Integrated Four Channel Digital Isolators”, News Release, Mar. 20, 2006, 3 pages. |
Silicon Laboratories, “Triple-Channel Digital Isolator”, Si8430/31/35 datasheet, Rev. 0.3, Aug. 2007, 30 pages. |
Simburger et al., “A Monolithic Transformer Coupled 5-W Silicon Power Amplifier with 59% PAE at 0.9 GHz”, IEEE Journal of Solid-State Circuits, vol. 34, No. 12, Dec. 1999, pp. 1881-1892. |
Small, “Medical Devices Demand Stringent Isolation Techniques”, EDN, Sep. 28, 2006, pp. 41-49. |
Standard Handbook for Electrical Engineers, “Carrier Communication, Tone Multiplex Equipment”, Tenth Edition, McGraw-Hill, 1968, 2 Cover Sheets (unnumbered), pp. 15-75 and 15- 84, 15-85, no month. |
Streetman, “Monolithic Device Elements”, Solid State Electronic Devices, Second Edition, Prentice-Hall, 1980, 2 Cover Sheets (unnumbered), pp. 346-347, no month. |
Streetman, “Semiconductor Materials” and “Monolithic Device Elements”, Solid State Electronic Devices, Third Edition, Prentice Hall, 1990, pp. 1-2 and p. 355, no month. |
Sugawara et al., “1.5 Gbps, 5150 ppm Spread Spectrum SerDes PHY with a 0.3 mW, 1.5 Gbps Level Detector for Serial ATA”, IEEE 2002 Symposium on VLSI Circuits, Digest of Technical Papers, Jun. 2002, pp. 60-63. |
Sze, “Physics and Properties of Semiconductors--A Resume”, Physics of Semiconductor Devices, Second Edition, John Wiley & Sons, 1981, 2 Cover Sheets (unnumbered), and p. 7, no month. |
Tabisz et al., “Zero-Voltage-Switched Quasi-Resonant Buck and Flyback Converters-Experimental Results at 10MHz”, IEEE Transactions on Power Electronics, vol. 4, No. 2, Apr. 1989, pp. 194-204. |
Tang, et al., “A Low-Profile Low-Power Converter with Coreless PCB Isolation Transformer”, IEEE Transactions on Power Electronics, vol. 16, No. 3, May 2001, pp. 311-315. |
Tang, et al., “A Low-Profile Wide-Band Three-Port Isolation Amplifier with Coreless Printed-Circuit-Board (PCB) Transformers”, IEEE Transactions on Industrial Electronics, vol. 48, No. 6, Dec. 2001, pp. 1180-1187. |
Texas Instruments, “3.3-V / 5-V High-Speed Digital Isolators”, ISO721 / ISO722 datasheet, Jan. 2006 (revised Feb. 2007), 24 pages. |
Texas Instruments, “Dual Digital Isolators”, 1507220 / 1507221 datasheet, Jul. 2006 (revised Aug. 2007), 25 pages. |
Texas Instruments, “Quad Digital Isolators”, ISO7240 / ISO7241 / ISO7242 datasheet, Sep. 2007 (revised Dec. 2007), 25 pages. |
Tsang et al., “Design, Fabrication, and Performance of Spin-Valve Read Heads for Magnetic Recording Applications”, IBM J. Res. Develop, vol. 42, No. 1, Jan. 1998, pp. 103-116. |
Tse et al., “Analysis and Spectral Characteristics of a Spread-Spectrum Technique for Conducted EMI Suppression”, IEEE Transactions on Power Electronics, vol. 15, No. 2, Mar. 2000, pp. 399-410. |
Walker et al., “An Isolated MOSFET Gate Driver”, Australasian Universities Power Engineering Conference (AUPEC '96), Oct. 1996, pp. 175-180. |
Wedlock et al., “Capacitors”, Electronic Components and Measurements, Prentice-Hall, 1969, 4 Cover Sheets (unnumbered), and p. 89, no month. |
Wolf, “Silicon Processing for the VLSI Era, vol. 2: Process Integration”, Lattice Press, 1990, 2 Cover Sheets (unnumbered), pp. 66-69, no month. |
Zhou et al., “A Fully Integrated CMOS 900MHz LNA Utilizing Monolithic Transformers”, IEEE International Conference on Solid-State Circuits, Feb. 5-7, 1998, Digest of Technical Papers, pp. 132-133. |
Zhou et al., “Monolithic Transformers and Their Application in a Differential CMOS RF Low-Noise Amplifier”, IEEE Journal of Solid State Circuits, vol. 33, No. 12, Dec. 1998, pp. 2020-2027. |
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20160126724 A1 | May 2016 | US |