# US 11,909,360 B2 · Radio frequency circuit, communication device, and antenna module > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,909,360 B2 - Document ID: US11909360B2 - Status: Granted - Kind: B2 - Application number: 17/820,652 - Filed: 2022-08-18 - Published: 2022-12-08 - Granted: 2024-02-20 - Earliest claimed: 2019-06-13 - Assignees: Murata Manufacturing Co., Ltd. - Applicants: Murata Manufacturing Co., Ltd. - Inventors: Tomohiro Sano; Hirotsugu Mori - Web page: https://patentgrep.com/patent/US11909360B2 ## CPC - H03F 1/0211: {with control of the supply voltage or current} - H03F 1/0227: {using supply converters} - H03F 3/19: with semiconductor devices only - H03F 3/21: with semiconductor devices only {(H03F3/245 takes precedence)} - H03F 3/245: {with semiconductor devices only} - H04B 1/006: {using switches for selecting the desired band (H04B1/0057 takes precedence)} - H04B 1/04: Circuits - H04B 1/0458: {Arrangements for matching and coupling between power amplifier and antenna or between amplifying stages (matching circuits in general H03H)} - H04B 1/0475: {with means for limiting noise, interference or distortion (H04B1/0483 takes precedence)} - H03F 1/0277: {Selecting one or more amplifiers from a plurality of amplifiers} - H03F 2200/102: A non-specified detector of a signal envelope being used in an amplifying circuit - 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 2200/171: A filter circuit coupled to the output of an amplifier - 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 - H04B: TRANSMISSION ## Abstract A radio frequency circuit includes a power amplifier configured to selectively amplify one of a first radio frequency signal and a second radio frequency signal that have different bandwidths, and when the first radio frequency signal is input to the power amplifier, a first bias signal is applied to the power amplifier, and when the second radio frequency signal is input to the power amplifier, a second bias signal different from the first bias signal is applied to the power amplifier. ## Claims ### Claim 1 A radio frequency circuit, comprising: an amplifier configured to amplify radio frequency signals having different bandwidths; a first switch configured to switch between application of a first bias signal to the amplifier and application of a second bias signal to the amplifier, wherein bias voltages of the first and second bias signals applied to the amplifier track a change in a power amplitude of the radio frequency signal amplified by the amplifier, wherein a degree of tracking the change in the power amplitude corresponds to a bandwidth of the radio frequency signal amplified by the amplifier, and wherein the first bias signal changes to track the change in power amplitude at a different degree than the second bias signal. ### Claim 2 (depends on 1) The radio frequency circuit according to claim 1, wherein a peak to average power ratio of at least one of the bias signals corresponds to the bandwidth of the radio frequency signal amplified by the amplifier. ### Claim 3 (depends on 1) The radio frequency circuit according to claim 1, further comprising: a second switch configured to switch between providing an input of a first radio frequency signal to the amplifier and providing an input of a second radio frequency signal to the amplifier, the first radio frequency signal having a different bandwidth than the second radio frequency signal, wherein the first switch and the second switch are configured to: synchronize the input of the first radio frequency signal to the amplifier and the application of the first bias signal to the amplifier; and synchronize the input of the second radio frequency signal to the amplifier and the application of the second bias signal to the amplifier. ### Claim 4 (depends on 1) The radio frequency circuit according to claim 1, wherein a modulation scheme of the amplifier corresponds to the bandwidth of the radio frequency signal amplified by the amplifier. ### Claim 5 (depends on 4) The radio frequency circuit according to claim 4, wherein the modulation scheme for a first radio frequency signal amplified by the amplifier is based on a fourth generation mobile communication system (4G), and wherein the modulation scheme for a second radio frequency signal amplified by the amplifier is based on a fifth generation mobile communication system (5G). ### Claim 6 (depends on 4) The radio frequency circuit according to claim 4, wherein the modulation scheme for a first radio frequency signal amplified by the amplifier is based on a fourth generation mobile communication system (4G), and wherein the modulation scheme for a second radio frequency signal amplified by the amplifier is based on a wireless local area network (WLAN). ### Claim 7 (depends on 4) The radio frequency circuit according to claim 4, wherein the modulation scheme for a first radio frequency signal amplified by the amplifier is based on a fifth generation mobile communication system (5G), and wherein the modulation scheme for a second radio frequency signal amplified by the amplifier is based on the 5G. ### Claim 8 (depends on 4) The radio frequency circuit according to claim 4, wherein the modulation scheme for a first radio frequency signal amplified by the amplifier is based on a fifth generation mobile communication system (5G), and wherein the modulation scheme for a second radio frequency signal amplified by the amplifier is based on a wireless local area network (WLAN). ### Claim 9 (depends on 1) The radio frequency circuit according to claim 1, further comprising: a bias power supply circuit configured to output at least one of the bias signals to the amplifier. ### Claim 10 (depends on 1) The radio frequency circuit according to claim 1, further comprising: a first bias power supply circuit configured to output the first bias signal to the amplifier; and a second bias power supply circuit configured to output the second bias signal to the amplifier. ### Claim 11 (depends on 1) The radio frequency circuit according to claim 1, further comprising: a filter connected to an output terminal of the amplifier, and having a passband that includes a frequency range of a first radio frequency signal amplified by the amplifier and a frequency range of a second radio frequency signal amplified by the amplifier, the first radio frequency signal having a different bandwidth than the second radio frequency signal. ### Claim 12 (depends on 1) A communication device, comprising: a signal processing circuit configured to process a radio frequency signal; and the radio frequency circuit according to claim 1 configured to receive the radio frequency signal processed by the signal processing circuit. ### Claim 13 (depends on 12) The communication device according to claim 12, wherein the signal processing circuit comprises: a first output terminal through which a first radio frequency signal amplified by the amplifier is output to the radio frequency circuit; and a second output terminal through which a second radio frequency signal amplified by the amplifier is output to the radio frequency circuit, wherein the first radio frequency signal has a different bandwidth than the second radio frequency signal. ### Claim 14 (depends on 1) An antenna module, comprising: the radio frequency circuit according to claim 1; and an antenna configured to radiate amplified radio frequency signals output from the radio frequency circuit. ### Claim 15 A radio frequency circuit, comprising: an amplifier configured to amplify radio frequency signals having different bandwidths, wherein a bias voltage of a bias signal applied to the amplifier tracks a change in a power amplitude of the radio frequency signal amplified by the amplifier, wherein a degree of tracking the change in the power amplitude corresponds to a bandwidth of the radio frequency signal amplified by the amplifier, wherein a modulation scheme of the amplifier corresponds to the bandwidth of the radio frequency signal amplified by the amplifier, wherein the modulation scheme for a first radio frequency signal amplified by the amplifier is based on a fourth generation mobile communication system (4G), wherein the modulation scheme for a second radio frequency signal amplified by the amplifier is based on a wireless local area network (WLAN), and wherein a peak to average power ratio (PAPR) of the bias signal when the first radio frequency signal is amplified by the amplifier is lower than the PAPR of the bias signal when the second radio frequency signal is amplified by the amplifier. ### Claim 16 A radio frequency circuit, comprising: an amplifier configured to amplify radio frequency signals having different bandwidths; a first bias power supply circuit configured to output a first bias signal to the amplifier; and a second bias power supply circuit configured to output a second bias signal to the amplifier, wherein bias voltages of the first and second bias signals applied to the amplifier tracks a change in a power amplitude of the radio frequency signal amplified by the amplifier, wherein a degree of tracking the change in the power amplitude corresponds to a bandwidth of the radio frequency signal amplified by the amplifier, and wherein the first bias signal changes to track the change in power amplitude at a different degree than the second bias signal. ### Claim 17 (depends on 16) The radio frequency circuit according to claim 16, wherein a peak to average power ratio of at least one of the bias signals corresponds to the bandwidth of the radio frequency signal amplified by the amplifier. ### Claim 18 (depends on 16) The radio frequency circuit according to claim 16, further comprising: a second switch configured to switch between providing an input of a first radio frequency signal to the amplifier and providing an input of a second radio frequency signal to the amplifier, the first radio frequency signal having a different bandwidth than the second radio frequency signal, wherein the second switch is configured to: synchronize the input of the first radio frequency signal to the amplifier and the application of the first bias signal to the amplifier; and synchronize the input of the second radio frequency signal to the amplifier and the application of the second bias signal to the amplifier. ### Claim 19 (depends on 16) The radio frequency circuit according to claim 16, wherein a modulation scheme of the amplifier corresponds to the bandwidth of the radio frequency signal amplified by the amplifier. ### Claim 20 (depends on 16) The radio frequency circuit according to claim 16, further comprising: a filter connected to an output terminal of the amplifier, and having a passband that includes a frequency range of a first radio frequency signal amplified by the amplifier and a frequency range of a second radio frequency signal amplified by the amplifier, the first radio frequency signal having a different bandwidth than the second radio frequency signal.