Claims
- 1. An apparatus, comprising;
a passive radio frequency (RF) transponder (Tag), comprising;
an antenna for receiving power and signals from an RF field, and for sending signals by backscattering power from the RF field; tag electronics connected to the antenna, the tag electronics contained in a single semiconductor chip, the tag electronics for receiving signals from the antenna and for controlling the antenna impedance for sending signals; a tag power supply in the single semiconductor chip for receiving RF power from the antenna, the tag power supply used as the sole power supply for the tag electronics; wherein the RF power is rectified in a diode rectifier circuit, and wherein the diode rectifier circuit comprises;
at least a first diode rectifier stage for producing a DC voltage greater than the AC RF voltage produced in the antenna by the RF field, and; at least a second diode rectifier stage for producing a voltage greater than twice the AC RF voltage produced in the antenna by the RF field; wherein the parasitic capacitance of the second diode rectifier stage is less than 80% of the parasitic capacitance of the first diode rectifier stage.
- 2. The apparatus of claim 1, wherein the parasitic capacitance of the second diode rectifier stage is less than 50% of the parasitic capacitance of the first diode rectifier stage.
- 3. The apparatus of claim 2, wherein the parasitic capacitance of the second diode rectifier stage is less than 30% of the parasitic capacitance of the first diode rectifier stage.
- 4. The apparatus of claim 1, wherein the second diode rectifier stage contains a coupling capacitor which has a capacitance CC, a parasitic capacitance CPC, and an RF impedance ZC, and wherein ZC is much less than the RF impedance ZQUAD of the diodes of the second diode rectifier stage.
- 5. The apparatus of claim 1, further comprising at least a third diode rectifier stage wherein the parasitic capacitance of the third diode rectifier stage is less than 50% of the parasitic capacitance of the second diode rectifier stage.
CROSS REFERENCE TO RELATED APPLICATIONS
[0001] The present application claims benefit from provisional U.S. application No. 60/430,553 entitled RFID Tag with a quadrupler or N-tupler circuit for efficient RF to DC conversion Inventors Vijay Pillai, Harley Kent Heinrich, Rene D. Martinez filed Dec. 3, 2002. The present application claims benefit from provisional U.S. application No. 60/385,528 filed Jun. 4, 2002. All of the above identified patents and patent applications are hereby incorporated herein by reference in their entirety including incorporated material.
Provisional Applications (2)
|
Number |
Date |
Country |
|
60385528 |
Jun 2002 |
US |
|
60430553 |
Dec 2002 |
US |