# US 12,191,814 B2 · Multi-mode power amplifier apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,191,814 B2 - Document ID: US12191814B2 - Status: Granted - Kind: B2 - Application number: 17/637,056 - Filed: 2020-08-19 - Published: 2022-09-22 - Granted: 2025-01-07 - Earliest claimed: 2019-08-22 - Assignees: Qorvo US, Inc. - Applicants: Qorvo US, Inc. - Inventors: Nadim Khlat - Web page: https://patentgrep.com/patent/US12191814B2 ## CPC - H03F 1/0233: {by using a signal derived from the output signal, e.g. bootstrapping the voltage supply} - H03F 1/56: Modifications of input or output impedances, not otherwise provided for - H03F 3/189: High-frequency amplifiers, e.g. radio frequency amplifiers - H03F 3/211: {using a combination of several amplifiers (H03F3/60 takes precedence)} - H03F 3/24: of transmitter output stages - H03F 3/245: {with semiconductor devices only} - H04B 1/04: Circuits - H03F 2200/102: A non-specified detector of a signal envelope being used in an amplifying circuit - H03F 2200/105: A non-specified detector of the power of a signal being used in an amplifying circuit - H03F 2200/192: A hybrid coupler being used at the input of an amplifier circuit - H03F 2200/204: A hybrid coupler being used at the output of an amplifier circuit - H03F 2200/387: A circuit being added at the output of an amplifier to adapt the output impedance of the amplifier - H03F 2200/451: the amplifier being a radio frequency amplifier - H04B 2001/0433: {with linearisation using feedback} - H03F: AMPLIFIERS - H04B: TRANSMISSION ## Abstract An envelope tracking (ET) power amplifier apparatus is provided. The multi-mode power amplifier apparatus includes a pair of power amplifiers configured to amplify a radio frequency (RF) signal(s) and an output circuit that outputs the amplified RF signal(s) to a signal output(s). In examples disclosed herein, a control circuit can cause the multi-mode power amplifier apparatus to operate in different power management modes by changing a load impedance coupled to the signal output(s). In a non-limiting example, the control circuit can change a power management mode of the multi-mode power amplifier apparatus based on modulation bandwidth of the RF signal(s). As a result, the multi-mode power amplifier apparatus can operate across a wide range of modulation bandwidth without compromising efficiency and performance. ## Claims ### Claim 1 A multi-mode power amplifier apparatus comprising: a first power amplifier configured to amplify a first composite signal comprising at least one radio frequency (RF) signal; a second power amplifier configured to amplify a second composite signal comprising the at least one RF signal; an output circuit configured to regenerate the at least one RF signal from the first composite signal and the second composite signal; a first signal output and a second signal output configured to output the at least one RF signal; and a control circuit configured to change a load impedance at one or more of the first signal output and the second signal output based on a modulation bandwidth of the RF signal to thereby cause the multi-mode power amplifier apparatus to operate in one of an envelope tracking (ET) mode and a hybrid mode. ### Claim 2 (depends on 1) The multi-mode power amplifier apparatus of claim 1 further comprising an impedance circuit coupled to the first signal output and the second signal output, wherein the control circuit is further configured to control the impedance circuit to change the load impedance. ### Claim 3 (depends on 1) The multi-mode power amplifier apparatus of claim 1 further comprising: a first signal input and a second signal input configured to receive the at least one RF signal; and an input circuit configured to generate the first composite signal and the second composite signal each comprising the at least one RF signal. ### Claim 4 (depends on 1) The multi-mode power amplifier apparatus of claim 1 further comprising an antenna switching circuit configured to selectively couple the first signal output and the second signal output to one or more antennas. ### Claim 5 (depends on 1) The multi-mode power amplifier apparatus of claim 1 further comprising an ET integrated circuit (ETIC) configured to provide a first ET voltage and a second ET voltage to the first power amplifier and the second power amplifier, respectively. ### Claim 6 (depends on 1) The multi-mode power amplifier apparatus of claim 1 further comprising: a first signal input and a second signal input configured to receive the at least one RF signal; an input circuit configured to generate the first composite signal and the second composite signal each comprising the at least one RF signal; an impedance circuit coupled to the first signal output and the second signal output; an antenna switching circuit coupled between the impedance circuit and one or more antennas; and an ET integrated circuit (ETIC) configured to provide a first ET voltage and a second ET voltage to the first power amplifier and the second power amplifier, respectively. ### Claim 7 (depends on 1) The multi-mode power amplifier apparatus of claim 1 wherein: the first power amplifier is further configured to amplify the first composite signal comprising an in-phase component of the at least one RF signal; and the second power amplifier is further configured to amplify the second composite signal comprising a quadrature component of the at least one RF signal and having equal average power as the first composite signal. ### Claim 8 (depends on 7) The multi-mode power amplifier apparatus of claim 7 wherein a selected one of the first signal output and the second signal output is configured to output the at least one RF signal comprising two times the in-phase component. ### Claim 9 (depends on 7) The multi-mode power amplifier apparatus of claim 7 wherein a selected one of the first signal output and the second signal output is configured to output the at least one RF signal comprising two times the quadrature component. ### Claim 10 (depends on 1) The multi-mode power amplifier apparatus of claim 1 wherein: the first power amplifier is further configured to amplify the first composite signal comprising a quadrature component of the at least one RF signal; and the second power amplifier is further configured to amplify the second composite signal comprising an in-phase component of the at least one RF signal and having equal average power as the first composite signal. ### Claim 11 (depends on 10) The multi-mode power amplifier apparatus of claim 10 wherein a selected one of the first signal output and the second signal output is configured to output the at least one RF signal comprising two times the in-phase component. ### Claim 12 (depends on 10) The multi-mode power amplifier apparatus of claim 10 wherein a selected one of the first signal output and the second signal output is configured to output the at least one RF signal comprising two times the quadrature component. ### Claim 13 (depends on 1) The multi-mode power amplifier apparatus of claim 1 wherein, when the at least one RF signal has the modulation bandwidth higher than a bandwidth threshold, the control circuit is further configured to: cause a selected one of the first signal output and the second signal output to output the at least one RF signal; and cause an open impedance to be coupled to another one of the first signal output and the second signal output not outputting the at least one RF signal. ### Claim 14 (depends on 13) The multi-mode power amplifier apparatus of claim 13 wherein the control circuit is further configured to selectively deactivate one of the first power amplifier and the second power amplifier when an average power of the at least one RF signal is below an average power threshold. ### Claim 15 (depends on 14) The multi-mode power amplifier apparatus of claim 14 wherein the control circuit is further configured to activate both the first power amplifier and the second power amplifier when the average power of the at least one RF signal is above the average power threshold. ### Claim 16 (depends on 13) The multi-mode power amplifier apparatus of claim 13 wherein the control circuit is further configured to couple the selected one of the first signal output and the second signal output to one or more antennas. ### Claim 17 (depends on 1) The multi-mode power amplifier apparatus of claim 1 wherein, when the at least one RF signal has the modulation bandwidth lower than a bandwidth threshold, the control circuit is further configured to: cause a selected one of the first signal output and the second signal output to output the at least one RF signal; and cause a fixed impedance to be coupled to another one of the first signal output and the second signal output not outputting the at least one RF signal. ### Claim 18 (depends on 17) The multi-mode power amplifier apparatus of claim 17 wherein the control circuit is further configured to couple the selected one of the first signal output and the second signal output to one or more antennas. ### Claim 19 (depends on 1) The multi-mode power amplifier apparatus of claim 1 wherein: the at least one RF signal comprises a first RF signal and a second RF signal; the first composite signal and the second composite signal each comprises the first RF signal and the second RF signal; the output circuit is further configured to regenerate the first RF signal and the second RF signal from the first composite signal and the second composite signal; and the control circuit is further configured to cause the first signal output and the second signal output to output the first RF signal and the second RF signal to one or more antennas. ### Claim 20 (depends on 19) The multi-mode power amplifier apparatus of claim 19 wherein: the first power amplifier is further configured to amplify the first composite signal comprising a quadrature component of the first RF signal and an in-phase component of the second RF signal; and the second power amplifier is further configured to amplify the second composite signal comprising an in-phase component of the first RF signal and a quadrature component of the second RF signal.