US 7,538,673 B2
Voltage regulation circuit for RFID systems
Ganesh K. Balachandran, Irving, Tex. (US); and Raymond E. Barnett, Dallas, Tex. (US)
Assigned to Texas Instruments Incorporated, Dallas, Tex. (US)
Filed on Aug. 26, 2005, as Appl. No. 11/213,063.
Prior Publication US 2007/0046474 A1, Mar. 01, 2007
Int. Cl. G08B 13/14 (2006.01)
U.S. Cl. 340—572.1  [340/10.34; 375/316] 15 Claims
OG exemplary drawing
 
1. A voltage regulation circuit for an RFID circuit comprising:
a voltage limiter circuit having a current sensing element for sensing current through the voltage limiter circuit, the voltage limiter generating a limited voltage;
a voltage regulator coupled to the limited voltage for generating a regulated output voltage, the voltage regulator having a dynamic biasing current responsive to an output of the sensing element for increasing bandwidth of the voltage regulator when current in the voltage limiter circuit increases.