# US 11,309,851 B2 · Power supply circuitry and radio communication apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,309,851 B2 - Document ID: US11309851B2 - Status: Granted - Kind: B2 - Application number: 16/791,053 - Filed: 2020-02-14 - Published: 2021-03-11 - Granted: 2022-04-19 - Earliest claimed: 2019-09-06 - Assignees: Kabushiki Kaisha Toshiba; Toshiba Electronic Devices & Storage Corporation - Applicants: Kabushiki Kaisha Toshiba; Toshiba Electronic Devices & Storage Corporation - Inventors: Minoru Nagata - Web page: https://patentgrep.com/patent/US11309851B2 ## CPC - H03F 3/193: with field-effect devices (H03F3/195 takes precedence) - G05F 1/565: sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor (G05F1/563 takes precedence) - G05F 1/575: characterised by the feedback circuit - G05F 3/262: {using field-effect transistors only} - H03F 1/0222: {by using a signal derived from the input signal} - H03F 3/24: of transmitter output stages - H03F 3/245: {with semiconductor devices only} - H03F 3/45475: {using IC blocks as the active amplifying circuit} - H03F 3/72: Gated amplifiers, i.e. amplifiers which are rendered operative or inoperative by means of a control signal - H04B 1/0483: {Transmitters with multiple parallel paths} - H03F 2200/111: the amplifier being a dual or triple band amplifier, e.g. 900 and 1800 MHz, e.g. switched or not switched, simultaneously or not - H03F 2200/15: the supply or bias voltage or current at the drain side of a FET being continuously controlled by a controlling signal - H03F 2200/18: the bias of the gate of a FET being controlled by a control signal - H03F 2200/294: the amplifier being a low noise amplifier [LNA] - H03F 2200/451: the amplifier being a radio frequency amplifier - H03F 2203/7209: the gated amplifier being switched from a first band to a second band - H03F: AMPLIFIERS - G05F: SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES - H04B: TRANSMISSION ## Abstract A power supply circuitry includes a first circuitry, a second circuitry, a fourth circuitry, and a fifth circuitry. The first circuitry outputs a first current based on a drive signal. The second circuitry generates a second current according to the first current. The fourth circuitry generates the drive signal based on a first voltage according to the first current. The fifth circuitry outputs a second voltage based on the first current and on the second current. ## Claims ### Claim 1 A power supply circuitry comprising: a first circuitry configured to output a first current based on a drive signal; a second circuitry configured to output a second current according to the first current; a fourth circuitry configured to generate the drive signal based on a first voltage according to the first current; and a fifth circuitry configured to output a second voltage based on the first current and on the second current. ### Claim 2 (depends on 1) The power supply circuitry according to claim 1, wherein: the first circuitry comprises a first transistor; and the second circuitry comprises a second transistor forming a current mirror with the first transistor. ### Claim 3 (depends on 1) The power supply circuitry according to claim 1, wherein the fourth circuitry comprises a first differential amplifier configured to amplify a difference between the first voltage and a reference voltage. ### Claim 4 (depends on 1) The power supply circuitry according to claim 1, wherein the fifth circuitry comprises a second differential amplifier configured to compare a voltage based on the second current and on a reference current with the first voltage and output the second voltage. ### Claim 5 (depends on 1) The power supply circuitry according to claim 1, further comprising a third circuitry configured to generate a feedback voltage based on the first voltage, wherein the fourth circuitry generates the drive signal based on the feedback voltage. ### Claim 6 (depends on 5) The power supply circuitry according to claim 5, wherein the third circuitry comprises a resistance coupled between a terminal to which the first voltage is applied and a reference potential, and outputs the feedback voltage from a terminal which is obtained by dividing the resistance by a predetermined ratio. ### Claim 7 (depends on 5) The power supply circuitry according to claim 5, wherein the fourth circuitry comprises a first differential amplifier configured to amplify a difference between the feedback voltage and a reference voltage. ### Claim 8 (depends on 5) The power supply circuitry according to claim 5, wherein the fifth circuitry comprises a second differential amplifier configured to compare a voltage based on the second current and on a reference current with the first voltage and output the second voltage. ### Claim 9 A power supply circuitry comprising: a first transistor configured to output a first current; a first differential amplifier coupled to a drive terminal of the first transistor and configured to apply a drive voltage which drives the first transistor, to the first transistor based on a difference between a voltage output from the first transistor and a reference voltage; a second transistor having a drive terminal coupled to the drive terminal of the first transistor and configured to output a second current proportional to the first current; and a second differential amplifier coupled to an output of the first transistor and to an output of the second transistor and configured to output a second voltage based on a difference between the output of the first transistor and the output of the second transistor. ### Claim 10 (depends on 9) The power supply circuitry according to claim 9, further comprising a feedback circuitry coupled to the output of the first transistor and to the first differential amplifier and configured to feed back a first voltage based on the first current to the first differential amplifier. ### Claim 11 (depends on 1) A radio communication apparatus, comprising: the power supply circuitry according to claim 1; and an amplifier circuitry configured to use the first voltage as a power supply voltage and use the second voltage as a bias voltage with respect to an input signal, and amplify the input signal and output the amplified signal. ### Claim 12 (depends on 11) The radio communication apparatus according to claim 11, further comprising: a plurality of antennas configured to receive signals in a plurality of frequency bands, on a frequency band basis; and a switch corresponding to each of the antennas and configured to select the amplifier circuitry which performs processing among a plurality of the amplifier circuitries, based on a frequency of the signal received by each of the antennas, wherein the power supply circuitry is provided for each of the amplifier circuitries, and the first voltage and the second voltage are set based on the frequency of the signal amplified by the corresponding amplifier circuitry. ### Claim 13 (depends on 11) The radio communication apparatus according to claim 11, wherein: the input signal is a high-frequency signal; and the amplifier circuitry is a high-frequency amplifier circuitry. ### Claim 14 (depends on 5) A radio communication apparatus, comprising: the power supply circuitry according to claim 5; and an amplifier circuitry configured to use the first voltage as a power supply voltage and use the second voltage as a bias voltage with respect to an input signal, and amplify the input signal and output the amplified signal. ### Claim 15 (depends on 14) The radio communication apparatus according to claim 14, further comprising: a plurality of antennas configured to receive signals in a plurality of frequency bands, on a frequency band basis; and a switch corresponding to each of the antennas and configured to select the amplifier circuitry which performs processing among a plurality of the amplifier circuitries, based on a frequency of the signal received by each of the antennas, wherein the power supply circuitry is provided for each of the amplifier circuitries, and the first voltage and the second voltage are set based on the frequency of the signal amplified by the corresponding amplifier circuitry. ### Claim 16 (depends on 14) The radio communication apparatus according to claim 14, wherein: the input signal is a high-frequency signal; and the amplifier circuitry is a high-frequency amplifier circuitry. ### Claim 17 (depends on 9) A radio communication apparatus, comprising: the power supply circuitry according to claim 9; and an amplifier circuitry configured to use the first voltage as a power supply voltage and use the second voltage as a bias voltage with respect to an input signal, and amplify the input signal and output the amplified signal. ### Claim 18 (depends on 10) A radio communication apparatus, comprising: the power supply circuitry according to claim 10; and an amplifier circuitry configured to use the first voltage as a power supply voltage and use the second voltage as a bias voltage with respect to an input signal, and amplify the input signal and output the amplified signal.