US 12,216,486 B2
Voltage regulator circuit for RFID circuit
Pairote Sirinamaratana, Nonthaburi (TH); and Pattrakorn Chokchalermwat, Nonthaburi (TH)
Assigned to SILICON CRAFT TECHNOLOGY PUBLIC COMPANY LIMITED (SICT), Bangkok (TH)
Appl. No. 18/269,921
Filed by SILICON CRAFT TECHNOLOGY PUBLIC COMPANY LIMITED (SICT), Bangkok (TH)
PCT Filed Dec. 28, 2020, PCT No. PCT/IB2020/062466
§ 371(c)(1), (2) Date Jun. 27, 2023,
PCT Pub. No. WO2022/144566, PCT Pub. Date Jul. 7, 2022.
Prior Publication US 2024/0085933 A1, Mar. 14, 2024
Int. Cl. G05F 1/56 (2006.01); G05F 3/26 (2006.01); G06K 19/07 (2006.01)
CPC G05F 1/56 (2013.01) [G05F 3/262 (2013.01); G06K 19/0708 (2013.01)] 27 Claims
OG exemplary drawing
 
1. A voltage regulator circuit for an RFID circuit comprising:
first and second input nodes connected to outputs of a rectifier circuit which generate half wave rectified voltage signals from an electromagnetic wave signal received by the RFID circuit;
an output node connected to RFID circuit;
a control circuit connected to the first and second input nodes, a control node and a sensing node, wherein the control circuit is able to control the control node when triggered by the sensing node, the control circuit comprises first and second transistors of cross-coupled pair forming the cross-coupled pair configuration,
an impulse current source connected to the first and second transistors of cross-coupled pair,
a first switch connected to the first and second transistors of cross-coupled pair,
a second switch connected to the first and second transistors of cross-coupled pair, and
a third switch connected to the first and second transistors of cross-coupled pair;
a driving element coupled between the first input node and the output node and driven by the control node, wherein the driving element comprises
a driving transistor connected to the first input node and the control node to drive the current from the first input node to the output node when driven by the control node, and
a blocking diode coupled between the driving transistor and the output node to block the current from flowing back to the first input node; and
a sensing circuit connected to the output node, wherein the sensing circuit is capable of sensing an output voltage and signaling the control circuit when sensed voltage reaches a target value, the sensing circuit comprises an output voltage adjusting component,
a fourth switch connecting the sensing node and the output voltage adjusting component, and
a fifth switch connecting the sensing node to ground.