The disclosure relates to integrated circuits (IC's), and more specifically, to techniques for designing a transmitter circuit capable of dual-mode linear and polar operation.
Modern wireless communications devices often support signal transmission and reception over multiple radio frequency bands, using one of several distinct communications protocols or standards. For example, a single cellular phone may communicate using any or all of the WCDMA, CDMA, GSM, EDGE, and LTE standards for cellular telephony, over any frequency bands allotted for such communications.
In a communications device, radio-frequency (RF) circuitry is typically provided to upconvert a baseband signal to a particular radio frequency band for wireless transmission. The RF circuitry supporting each frequency band and/or wireless standard typically must satisfy different design constraints. For example, for certain modulation formats, it may be advantageous to use a linear architecture for upconverting the baseband signal, e.g., in-phase and quadrature components of the baseband signal are multiplied with corresponding in-phase and quadrature components of a local oscillator signal. Alternatively, for other modulation formats, it may be advantageous to use a polar architecture for upconverting the baseband signal, e.g., a single baseband signal having real amplitude is multiplied with a local oscillator signal having variable phase.
To accommodate multiple modulation formats, it would be desirable to provide a communications device capable of operation in both linear and polar modes, while minimizing unnecessary replication of component circuitry.
An aspect of the present disclosure provides a method for upconverting a baseband signal comprising: in a linear mode, mixing a baseband in-phase (BB I) signal with a local oscillator in-phase (LO I) signal using a primary mixer; in the linear mode, mixing a baseband quadrature (BB Q) signal with a local oscillator quadrature (LO Q) signal using a secondary mixer; in the linear mode, combining the outputs of the primary and secondary mixers to generate an upconverted signal; and in a polar mode, mixing a baseband amplitude (BB) signal with a phase-modulated local oscillator (LO) signal using the primary mixer.
Another aspect of the present disclosure provides an apparatus for upconverting a baseband signal comprising: a primary mixer configured to, in a linear mode, mix a baseband in-phase (BB I) signal with a local oscillator in-phase (LO I) signal, the primary mixer further configured to, in a polar mode, mix a baseband amplitude (BB) signal with a phase-modulated local oscillator (LO) signal; and a secondary mixer configured to, in the linear mode, mix a baseband quadrature (BB Q) signal with a local oscillator quadrature (LO Q) signal.
Yet another aspect of the present disclosure provides an apparatus for upconverting a baseband signal comprising: primary means for mixing a baseband in-phase (BB I) signal with a local oscillator in-phase (LO I) signal in a linear mode, and for mixing a baseband amplitude (BB) signal with a local oscillator (LO) signal in a polar mode; and secondary means for mixing a baseband quadrature (BB Q) signal with a local oscillator quadrature (LO Q) signal in the linear mode, and mixing the BB signal with the LO signal in the polar mode.
Yet another aspect of the present disclosure provides a computer program product for instructing a transmitter to upconvert a baseband signal, the transmitter comprising a primary mixer for multiplying a first baseband signal with a first local oscillator signal and a secondary mixer for multiplying a second baseband signal with a second local oscillator signal, the product comprising: computer-readable medium comprising: code for causing a computer to, in the linear mode, digitally generate a baseband in-phase signal as the first baseband signal; and code for causing a computer to, in the polar mode, digitally generate a baseband amplitude signal as the first baseband signal.
The detailed description set forth below in connection with the appended drawings is intended as a description of exemplary embodiments of the present invention and is not intended to represent the only exemplary embodiments in which the present invention can be practiced. The term “exemplary” used throughout this description means “serving as an example, instance, or illustration,” and should not necessarily be construed as preferred or advantageous over other exemplary embodiments. The detailed description includes specific details for the purpose of providing a thorough understanding of the exemplary embodiments of the invention. It will be apparent to those skilled in the art that the exemplary embodiments of the invention may be practiced without these specific details. In some instances, well known structures and devices are shown in block diagram form in order to avoid obscuring the novelty of the exemplary embodiments presented herein.
The differential outputs of the mixers 104.1 and 104.2 are combined and coupled to a balun primary element 101.1 of balun 101. Balun 101 also includes a balun secondary element 101.2 electromagnetically coupled to the balun primary element 101.1. The balun 101 functions to convert a differential signal across the balun primary element 101.1 to a single-ended signal at node 101.2a of the balun secondary element 101.2, wherein the other node 101.2b of the balun secondary element 101.2 is coupled to a ground voltage. In
In
One of ordinary skill in the art will realize that the components in the transmitter 100 are shown for illustrative purposes only, and that a transmitter may generally be implemented using any of a number of alternative architectures not shown. For example, a transmitter may omit the balun element 101, and/or adopt additional filters and gain elements not shown. The techniques of the present disclosure are contemplated to be applicable to such alternative architectures not shown.
One of ordinary skill in the art will also appreciate that the circuit blocks depicted in the accompanying figures are intended only as functional illustrations, and are not meant to depict the degree to which certain functions may be integrated with each other. For example, in certain exemplary embodiments, a single integrated circuit (IC) may be provided that implements all of the functions of the baseband filters, the mixers, and the balun, while a separate IC may be provided that implements the function of the amplifier. Alternatively, all functional components shown may be implemented discretely, or together in a single chip. Such exemplary embodiments are contemplated to fall within the scope of the present disclosure.
In modern wireless devices, a single transmitter may be designed to accommodate multiple operating frequency ranges and/or wireless standards. For example, a transmitter may be designed to accommodate frequency ranges such as 824-914 MHz (used for wireless standards such as GSM850, GSM900, JCELL), and 1710-1980 MHZ (used for wireless standards such as DCS, PCS, IMT). The transmitter may also be designed to support multiple modulation formats, e.g., Gaussian minimum-shift keying (GMSK), quadrature amplitude modulation (QAM), quadrature phase-shift keying (QPSK), etc. To accommodate multiple frequency ranges, standards, and/or modulation formats, a single transmitter architecture may be alternately configured to support either a linear mode of operation or a polar mode of operation, as further described hereinbelow.
In linear mode, a baseband module 260 provides digital baseband signals BB I (digital) and BB Q (digital) to digital-to-analog converters (DAC's) 150.1 and 150.2, respectively. The DAC's 150.1 and 150.2 output analog differential baseband signals BB I (analog) and BB Q (analog) to upconversion module 210. BB I and BB Q contain the in-phase and quadrature components, respectively, of the signal to be transmitted. Within the upconversion module 210, BB I and BB Q are filtered by filters 103.1 and 103.2, respectively, and mixed with in-phase and quadrature local oscillator signals LO I and LO Q, respectively, using mixers 104.1 and 104.2. One of ordinary skill in the art will appreciate that, in linear mode, the modulated information is contained in the amplitudes of the BB I and BB Q signals.
In polar mode, the baseband module 260 provides digital baseband amplitude signal BB (digital) to DAC 250.1, which generates a single analog differential baseband signal BB (analog) for input to upconversion module 220. Within the upconversion module 220, BB (analog) is filtered by filter 203.1, and mixed with a single local oscillator signal LO using mixer 204.1. One of ordinary skill in the art will appreciate that, in polar mode, the modulated information is contained in the amplitude of the BB signal, as well as in the phase of the LO signal.
One of ordinary skill in the art will appreciate that to select between operation in linear mode and operation in polar mode, a variety of techniques may be employed. For example, in an exemplary embodiment (not shown), a switch may be provided to couple the balun 101.1 to either the output of upconversion module 210 or the output of upconversion module 220. In an alternative exemplary embodiment (not shown), one of the upconversion modules 210 and 220 may be selectively powered off and on, e.g., by a digital signal (not shown) generated by the baseband module 260. Such exemplary embodiments are contemplated to be within the scope of the present disclosure.
While the transmitter 200 depicted in
In
In an exemplary embodiment, the baseband module 360 may generate BB I (digital) in linear mode, and BB (digital) in polar mode. In an alternative exemplary embodiment (not shown), digital or analog switching means may be provided to select BB I as the input to signal path 310.1 in linear mode, and to select BB as the input to signal path 310.1 in polar mode.
In an exemplary embodiment, the LO I/LO signal may be generated by a single frequency synthesizer (not shown), which can be alternately configured to generate an unmodulated local oscillator signal (LO I) during linear mode, and a modulated local oscillator signal (LO) during polar mode.
One of ordinary skill in the art will appreciate that in polar mode, the transmitter 300 effectively selects only one of the two signal paths used in linear mode, and supplies the selected signal path with the appropriate baseband and local oscillator signals for polar mode. This implementation avoids the need to provide separate upconversion modules, such as modules 210 and 220 depicted in
While the transmitter 300 avoids some of the replication of circuitry found in
In linear mode, the first signal path 440.1 multiplies the BB I signal derived from the baseband module 460 with the LO I signal. Switches 410.1, 410.2, 420.1, and 420.2 are configured to allow the second signal path 440.2 to multiply the BB Q signal derived from the baseband module 460 with the LO Q signal, by coupling a first differential input of the mixer 404.2 to BB Q, and a second differential input of the mixer 404.2 to LO Q.
In polar mode, the baseband module 460 provides a single differential baseband signal BB to upconversion module 440. In an exemplary embodiment, the other baseband signal BB Q may be disabled in polar mode (not shown). The switches 410.1 and 410.2 are configured in polar mode to couple the differential ends of the BB signal from the first signal path 440.1 to the first differential input of mixer 404.2 in the second signal path 440.2. Furthermore, the switches 420.1 and 420.2 are configured to couple the differential ends of the LO signal to the second differential input of mixer 404.2. Using this switch configuration, the upconversion module 440 mixes the signal BB with the local oscillator signal LO using both mixers 404.1 and 404.2 in polar mode.
One of ordinary skill in the art will appreciate that alternative exemplary embodiments wherein the upconversion module 440 is designed to work with only the BB Q and LO Q signals in polar mode are also contemplated to be within the scope of the present disclosure. In fact, the designations of “I” and “Q” in this specification, in the claims, and in an arbitrary circuit design are generally interchangeable.
By employing the same two signal paths in both linear and polar mode, the architecture of transmitter 400 offers several advantages over the architectures of transmitters 200 and 300. For example, the transmitter 400 requires only two separate mixers 404.1 and 404.2, as compared to the at least three mixers 104.1, 104.2, and 204.1 required by the dual-mode transmitter 200. This leads to less die area being consumed by the transmitter 400, as well as to a simpler circuit design. Fewer mixers may also result in fewer parasitic elements loading the balun 101.1, allowing for the use of a single balun across a broad frequency range, e.g., from 800 MHz to 2 GHz.
Furthermore, compared to the transmitter 300, an advantage of the transmitter 400 is that, for equivalent levels of transmit power, each of the two signal paths 440.1 and 440.2 will consume approximately half of the total current consumed by the single mixer signal path 310.1 in polar mode. As the voltage drop across each signal path circuit element is related to the corresponding current flow in each element, the parallel-coupled signal paths 440.1 and 440.2 may require less voltage supply headroom than the single signal path 310.1 in polar mode. Thus transmitter 400 may advantageously operate with a lower voltage supply than transmitter 300. One of ordinary skill in the art will also appreciate that providing two signal paths 440.1 and 440.2 effectively doubles the available size of the mixer used for upconverting the baseband signal BB, compared to the embodiment wherein only one of the signal paths is employed.
In the transmitter 600, mixer 640 is composed of sub-mixers 640.1 through 640.N, and LO buffer 630 is composed of associated sub-LO buffers 630.1 through 630.N. Note each of the sub-mixers 640.1 through 640.N shown may include a plurality of separate mixer circuits (not shown) including, e.g., an I mixer and an inverse I mixer for differential processing, and a Q mixer along with inverse Q mixer. Similarly, each of the sub-LO buffers 630.1 through 630.N shown may include a plurality of separate LO buffer circuits (not shown) for each of the plurality of separate mixer circuits.
In
In
In the transmitter 600, the baseband processor 610 may select which of the sub-mixers, sub-LO buffers, and baseband filters to enable, based on criteria including, e.g., total gain of the transmit power required to be delivered to the driver amplifier. For example, to operate in a lowest gain mode, only sub-mixer 640.1, sub-LO buffer 630.1, and baseband filter 620.1 may be enabled, with the remaining sub-mixers, sub-LO buffers, and baseband filters being disabled. This mode may correspond to operating the transmitter 600 with a mixer and LO buffer of minimum size. To operate in a highest gain mode, all of sub-mixers 640.1 through 640.N, sub-LO buffers 630.1 through 630.N, and baseband filters 620.1 through 620.N may be enabled. This mode may correspond to operating the transmitter 600 with a mixer and LO buffer of maximum size. One of ordinary skill in the art will appreciate that a mixer and LO buffer of an intermediate size may be obtained by enabling a corresponding subset of the sub-mixers and sub-LO buffers.
In an exemplary embodiment, each of the sub-mixers 640.1 through 640.N may be nominally identically sized to allow accurate control of the gain step size available to the transmitter 600.
At step 710, in linear mode, the method mixes the baseband quadrature (BB Q) signal with the local oscillator quadrature (LO Q) signal using a primary mixer.
At step 720, in linear mode, the method mixes the baseband in-phase (BB I) signal with the local oscillator in-phase (LO I) signal using a secondary mixer.
At step 730, in polar mode, the method mixes the baseband quadrature (BB Q) signal with the local oscillator quadrature signal (LO Q) signal using the primary mixer.
At step 740, in polar mode, the method mixes the baseband quadrature (BB Q) signal with the local oscillator quadrature signal (LO Q) signal using the secondary mixer.
At step 750, the method combines the outputs of the primary and secondary mixers to generate the upconverted signal.
Based on the teachings described herein, it should be apparent that an aspect disclosed herein may be implemented independently of any other aspects and that two or more of these aspects may be combined in various ways. In one or more exemplary embodiments, the functions described may be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a computer. By way of example, and not limitation, such computer-readable media can comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer. Also, any connection is properly termed a computer-readable medium. For example, if the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave, then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of medium. Disk and disc, as used herein, includes compact disc (CD), laser disc, optical disc, digital versatile disc (DVD), floppy disk and Blu-Ray disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above should also be included within the scope of computer-readable media.
In this specification and in the claims, it will be understood that when an element is referred to as being “connected to” or “coupled to” another element, it can be directly connected or coupled to the other element or intervening elements may be present. In contrast, when an element is referred to as being “directly connected to” or “directly coupled to” another element, there are no intervening elements present.
A number of aspects and examples have been described. However, various modifications to these examples are possible, and the principles presented herein may be applied to other aspects as well. These and other aspects are within the scope of the following claims.
The present application is a continuation-in-part of U.S. patent application Ser. No. 12/209,164, entitled “Local oscillator buffer and mixer having adjustable size,” filed Sep. 11, 2008, the contents of which are hereby incorporated by reference in their entirety. U.S. patent application Ser. No. 12/209,164 is a continuation-in-part of U.S. patent application Ser. No. 11/855,997, entitled “Mixer with high output power accuracy and low local oscillator leakage,” filed on Sep. 14, 2007, now U.S. Pat. No. 8,019,310, issued Sep. 13, 2011, assigned to the assignee of the present application, the contents of which are hereby incorporated by reference in their entirety. U.S. patent application Ser. No. 12/209,164 is also a continuation-in-part of U.S. patent application Ser. No. 11/955,201, entitled “Local oscillator buffer and mixer having adjustable size,” filed on Dec. 12, 2007, now U.S. Pat. No. 7,941,115, issued May 10, 2011, which claims priority to U.S. Provisional Patent Application Ser. No. 60/983,879, filed on Oct. 30, 2007, both assigned to the assignee of the present application, the contents of which are hereby incorporated by reference in their entirety.
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Parent | 12209164 | Sep 2008 | US |
Child | 12277913 | US | |
Parent | 11855997 | Sep 2007 | US |
Child | 12209164 | US | |
Parent | 11955201 | Dec 2007 | US |
Child | 11855997 | US |