# US 12,216,486 B2 · Voltage regulator circuit for RFID circuit > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,216,486 B2 - Document ID: US12216486B2 - Status: Granted - Kind: B2 - Application number: 18/269,921 - Filed: 2020-12-28 - Published: 2024-03-14 - Granted: 2025-02-04 - Earliest claimed: 2020-12-28 - Assignees: Silicon Craft Technology Public Company Limited (SICT) - Applicants: Silicon Craft Technology Public Company Limited (Sict) - Inventors: Pairote Sirinamaratana; Pattrakorn Chokchalermwat - Web page: https://patentgrep.com/patent/US12216486B2 ## CPC - G05F 1/56: using semiconductor devices in series with the load as final control devices (G05F1/461 takes precedence) - G05F 1/618: using semiconductor devices in series and in parallel with the load as final control devices (G05F1/461 takes precedence) - G05F 3/262: {using field-effect transistors only} - G06K 19/0701: {at least one of the integrated circuit chips comprising an arrangement for power management} - G06K 19/0708: {the source being electromagnetic or magnetic} - G05F: SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES - G06K: GRAPHICAL DATA READING (image or video recognition or understanding G06V); PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS ## Abstract A voltage regulator circuit for RFID circuit utilizing a high efficiency circuit topology to minimize power consumption to provide only required current to regulate output voltage. The voltage regulator circuit does not consume quiescent current which minimizes power consumption. It does not contain inductor, transformer, op-amp, voltage and current reference which reduces complexity and die area. The voltage regulator circuit comprises a driving element, a control circuit and a sensing circuit. The driving element drives controlled current to output to ramp up the voltage. The sensing circuit measures voltage at the output and sends signal to the control circuit if the voltage reaches target value set by the internal parameters of the components. The control circuit stops the driving element when output voltage reaches the threshold minimizing current required to regulate voltage. ## Claims ### Claim 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. ### Claim 2 (depends on 1) The voltage regulator circuit for an RFID circuit of claim 1 further comprising an output capacitor connecting the output node to ground. ### Claim 3 (depends on 1) The voltage regulator circuit for an RFID circuit of claim 1 wherein the first switch and the third switch are connected with the first and second transistors of cross-coupled pair via latch node. ### Claim 4 (depends on 1) The voltage regulator circuit for an RFID circuit of claim 1 wherein the second switch is connected with the first and second transistors of cross-coupled pair via the control node. ### Claim 5 (depends on 1) The voltage regulator circuit for an RFID circuit of claim 1 wherein the impulse current source is connected between the first input node and the first transistor of cross-coupled pair. ### Claim 6 (depends on 1) The voltage regulator circuit for an RFID circuit of claim 1 wherein the first switch is configured to connect between the latch node and ground. ### Claim 7 (depends on 1) The voltage regulator circuit for an RFID circuit of claim 1 wherein the second switch is configured to connect between the control node and ground. ### Claim 8 (depends on 1) The voltage regulator circuit for an RFID circuit of claim 1 wherein the third switch is configured to connect either between the latch node and the first input node or between the latch node and ground. ### Claim 9 (depends on 1) The voltage regulator circuit for an RFID circuit of claim 1 wherein the first switch is transistor driven by the sensing node. ### Claim 10 (depends on 1) The voltage regulator circuit for an RFID circuit of claim 1 wherein the second and third switches are transistors driven by a second holding node, controlled by switch controller. ### Claim 11 (depends on 10) The voltage regulator circuit for an RFID circuit of claim 10 wherein the switch controller comprises first, second, third and fourth transistors of switch controller which the first and second transistors of switch controller are connected in diode-connected configuration. ### Claim 12 (depends on 11) The regulator circuit for an RFID circuit of claim 11 wherein the first transistor of switch controller is configured to connect the first input node to first holding node. ### Claim 13 (depends on 11) The regulator circuit for an RFID circuit of claim 11 wherein the second transistor of switch controller is configured to connect the second input node to the second holding node. ### Claim 14 (depends on 11) The regulator circuit for an RFID circuit of claim 11 wherein the third transistor of switch controller is connected to the first holding node to ground driven by the second input node. ### Claim 15 (depends on 11) The regulator circuit for an RFID circuit of claim 11 wherein the fourth transistor of switch controller is configured to connect the second holding node to ground driven by the first holding node. ### Claim 16 (depends on 11) The voltage regulator circuit for an RFID circuit of claim 11 wherein the first and second transistors of switch controller connecting each input node to the third switch and the second switch. ### Claim 17 (depends on 11) The voltage regulator circuit for an RFID circuit of claim 11 wherein the first and second transistors of switch controller could be replaced with diode. ### Claim 18 (depends on 1) The voltage regulator circuit for an RFID circuit of claim 1 wherein the impulse current source in the control circuit comprises a current mirror having a first mirror transistor and a second mirror transistor, wherein source terminals of the first mirror transistor and the second mirror transistor connecting together with the first input node, and gates of the first mirror transistor and the second mirror transistor connecting together with the mirror node, and a current source resetting transistor coupled the mirror node to ground. ### Claim 19 (depends on 18) The voltage regulator circuit for an RFID circuit of claim 18 wherein the mirror node is coupled to ground via the current source resetting transistor. ### Claim 20 (depends on 18) The voltage regulator circuit for an RFID circuit of claim 18 wherein the current source resetting transistor is driven by the second input node. ### Claim 21 (depends on 18) The voltage regulator circuit for an RFID circuit of claim 18 wherein drain of the first mirror transistor is connected to the mirror node. ### Claim 22 (depends on 18) The voltage regulator circuit for an RFID circuit of claim 18 further comprising a capacitor connecting the mirror node to ground. ### Claim 23 (depends on 1) The voltage regulator circuit for an RFID circuit of claim 1 wherein the blocking diode could be replaced with a diode-connected transistor. ### Claim 24 (depends on 1) The voltage regulator circuit for an RFID circuit of claim 1 wherein the output voltage adjusting component is either diode, diode-connected transistor, stacks of diodes, diode-connected transistor, resistor, or any combination thereof. ### Claim 25 (depends on 1) The voltage regulator circuit for an RFID circuit of claim 1 wherein the target value could be internally adjusted. ### Claim 26 (depends on 1) The voltage regulator circuit for an RFID circuit of claim 1 wherein the fourth switch is a transistor driven by one of the input nodes. ### Claim 27 (depends on 1) The voltage regulator circuit for an RFID circuit of claim 1 wherein the fifth switch is a transistor driven by the other one of the input nodes.