# US 12,761,675 B2 · Dual feedback voltage regulator > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,761,675 B2 - Document ID: US12761675B2 - Status: Granted - Kind: B2 - Application number: 18/496,726 - Filed: 2023-10-27 - Published: 2024-05-02 - Granted: 2026-10-13 - Earliest claimed: 2022-10-27 - Assignees: Quantefi Corporation - Applicants: Quantefi Corporation - Inventors: Sriramasubramanya Ayyagari - Web page: https://patentgrep.com/patent/US12761675B2 ## CPC - G05F 1/468: {characterised by reference voltage circuitry, e.g. soft start, remote shutdown} - G05F 1/618: using semiconductor devices in series and in parallel with the load as final control devices (G05F1/461 takes precedence) - G05F: SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES ## Abstract A voltage regulator may comprise an output node, a pass device, a first feedback circuit, and a second feedback circuit. The output node may be operable to be coupled to a load. The pass device may be operable to pass current to the output node based on a voltage applied to the pass device, wherein the pass device comprises a p-channel transistor. The first feedback circuit may be operable to adjust the voltage applied to the pass device based on an output node voltage. The second feedback circuit may be operable to adjust the voltage applied to the pass device based on a change to the output node voltage. ## Claims ### Claim 1 A voltage regulator, comprising: an output node operable to be coupled to a load; a pass device operable to pass current to the output node based on a voltage applied to the pass device, wherein the pass device comprises a p-channel transistor; a first feedback circuit operable to adjust the voltage applied to the pass device based on an output node voltage, wherein the first feedback circuit comprises an error amplifier and a resistor divider coupled between the output node and an input of the error amplifier; and a second feedback circuit operable to adjust the voltage applied to the pass device based on a change to the output node voltage, wherein the second feedback circuit comprises a capacitor coupled in parallel with a resistor of the resistor divider. ### Claim 2 (depends on 1) The voltage regulator of claim 1, wherein the first feedback circuit comprises a first resistor, a second resistor, and an amplifier, and wherein the first feedback circuit is operable to generate voltage feedback to be input to the amplifier using the first resistor and the second resistor. ### Claim 3 (depends on 1) The voltage regulator of claim 1, wherein the second feedback circuit is operable to facilitate a reduced impedance at the output node by using a voltage follower. ### Claim 4 (depends on 1) The voltage regulator of claim 1, wherein the second feedback circuit is operable to facilitate a dominant pole for the voltage regulator that has increased stability in response to a load change. ### Claim 5 (depends on 1) The voltage regulator of claim 1, wherein the second feedback circuit is operable to adjust the output node based on an output voltage from the first feedback circuit and the change to the output node voltage. ### Claim 6 (depends on 1) The voltage regulator of claim 1, wherein the second feedback circuit comprises an alternating current (AC) feedback loop facilitating dynamic current to increase a transient response of the voltage regulator. ### Claim 7 (depends on 1) The voltage regulator of claim 1, further comprising a circuit comprising: one or more of a capacitor or a resistor, wherein the circuit is operable to increase a phase margin of the voltage regulator based on one or more of a dominant pole for the voltage regulator or a zero for the voltage regulator. ### Claim 8 (depends on 1) The voltage regulator of claim 1, further comprising a circuit comprising one or more transistors in a mirror configuration to facilitate one or more of: an increased transient response for the voltage regulator, or an increased power supply rejection ratio (PSRR) for the voltage regulator to match the PSRR when an n-channel transistor is used at the pass device. ### Claim 9 A voltage regulator comprising: an output node operable to be coupled to a load; a pass device operable to pass current to the output node based on a voltage applied to the pass device, wherein the pass device comprises a p-channel transistor; a first feedback circuit operable to adjust the voltage applied to the pass device based on an output node voltage, wherein the first feedback circuit comprises an error amplifier and a resistor divider coupled between the output node and an input of the error amplifier; a second feedback circuit operable to reduce an impedance of the output node by using a voltage follower; and a circuit operable to increase a phase margin of the voltage regulator. ### Claim 10 (depends on 9) The voltage regulator of claim 9, wherein the first feedback circuit comprises a first resistor, a second resistor, and an amplifier. ### Claim 11 (depends on 9) The voltage regulator of claim 9, wherein the second feedback circuit comprises a voltage follower. ### Claim 12 (depends on 9) The voltage regulator of claim 9, wherein the second feedback circuit comprises an alternating current (AC) feedback loop. ### Claim 13 (depends on 9) The voltage regulator of claim 9, wherein the circuit comprises one or more of a capacitor or a resistor. ### Claim 14 (depends on 9) The voltage regulator of claim 9, wherein the circuit comprises one or more transistors in a mirror configuration. ### Claim 15 A voltage regulator, comprising: an output node operable to be coupled to a load; a pass device operable to pass current to the output node based on a voltage applied to the pass device, wherein the pass device comprises a pass device p-channel transistor; and a first feedback circuit operable to adjust a voltage output to the pass device based on an output node voltage, wherein the first feedback circuit comprises an error amplifier and a resistor divider coupled between the output node and an input of the error amplifier; a second feedback circuit comprising a second feedback circuit first n-channel transistor and a second feedback circuit second n-channel transistor, wherein the second feedback circuit is operable to reduce an impedance of the output node by using a voltage follower; and a circuit comprising one or more circuit transistors in a mirror configuration to increase one or more of a power supply rejection ratio (PSRR) bandwidth or a transient response of the voltage regulator. ### Claim 16 (depends on 15) The voltage regulator of claim 15, wherein the one or more circuit transistors comprise one or more circuit p-channel transistors and one or more circuit n-channel transistors. ### Claim 17 (depends on 15) The voltage regulator of claim 15, wherein the one or more circuit transistors comprise a circuit first p-channel transistor and a circuit first mirrored p-channel transistor that are operable to input current to one or more of the pass device p-channel transistor or the second feedback circuit first n-channel transistor. ### Claim 18 (depends on 15) The voltage regulator of claim 15, wherein the one or more circuit transistors comprise a circuit first n-channel transistor and a circuit first mirrored n-channel transistor that are operable to receive current from the second feedback circuit first n-channel transistor. ### Claim 19 (depends on 15) The voltage regulator of claim 15, wherein the one or more circuit transistors comprise: a circuit first p-channel transistor operable to direct an input current to the second feedback circuit second n-channel transistor, and a circuit first n-channel transistor operable to direct an output current from the second feedback circuit second n-channel transistor, wherein the output current to the input current has a ratio greater than 1.0. ### Claim 20 (depends on 19) The voltage regulator of claim 19, wherein the ratio of the output current to the input current is selected to direct current to the second feedback circuit second n-channel transistor from the pass device p-channel transistor.