# US 10,122,422 B2 · Compensating amplifier phase in a diversity receiver front end > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,122,422 B2 - Document ID: US10122422B2 - Status: Granted - Kind: B2 - Application number: 15/608,420 - Filed: 2017-05-30 - Published: 2017-11-09 - Granted: 2018-11-06 - Earliest claimed: 2014-10-31 - Assignees: Skyworks Solutions, Inc. - Applicants: Skyworks Solutions, Inc. - Inventors: Stephane Richard Marie Wloczysiak - Web page: https://patentgrep.com/patent/US10122422B2 ## CPC - H04B 7/01: Reducing phase shift - H03F 1/0205: {in transistor amplifiers} - H03F 1/56: Modifications of input or output impedances, not otherwise provided for - H03F 3/19: with semiconductor devices only - H03F 3/195: in integrated circuits - H03F 3/211: {using a combination of several amplifiers (H03F3/60 takes precedence)} - H03F 3/245: {with semiconductor devices only} - H03F 3/72: Gated amplifiers, i.e. amplifiers which are rendered operative or inoperative by means of a control signal - H04B 1/16: Circuits - H04B 1/18: Input circuits, e.g. for coupling to an antenna or a transmission line (coupling networks between antennas or lines and receivers independent of the nature of the receiver H03H) - H04B 7/08: at the receiving station - H04B 7/0825: {with main and with auxiliary or diversity antennas} - 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 2200/387: A circuit being added at the output of an amplifier to adapt the output impedance of the amplifier - H03F 2200/411: the output amplifying stage of an amplifier comprising two power stages - H03F 2200/451: the amplifier being a radio frequency amplifier - H03F 2203/21106: An input signal being distributed in parallel over the inputs of a plurality of power amplifiers - H03F 2203/21112: A filter circuit being added at the input of a power amplifier stage - H03F 2203/7209: the gated amplifier being switched from a first band to a second band - H04B: TRANSMISSION - H03F: AMPLIFIERS ## Abstract Diversity receiver front end system with amplifier phase compensation. A receiving system can include a first amplifier disposed along a first path, corresponding to a first frequency band, between an input of the receiving system and an output of the receiving system. The receiving system can include a second amplifier disposed along a second path, corresponding to a second frequency band, between the input of the receiving system and the output of the receiving system. The receiving system can include a first phase-shift component disposed along the first path and configured to phase-shift the second frequency band of a signal passing through the first phase-shift component based on a phase-shift caused by the first amplifier at the second frequency band. ## Claims ### Claim 1 A method for phase-shifting signals in a receiving system, the method comprising: receiving a band select signal indicating one or more frequency bands; activating one or more of a plurality of paths through the receiving system based on the band select signal, the plurality of paths including a first path corresponding to a first frequency band and a second path corresponding to a second frequency band; sending a tuning signal to a first phase-shifting component on the first path and to a second phase-shifting component on the second path; and phase-shifting the second frequency band of a signal passing through the first phase-shift component using the first phase-shifting component, a phase-shift at the second frequency band of the first phase-shifting component based on a phase-shift caused by one or more components on the first path at the second frequency band. ### Claim 2 (depends on 1) The method of claim 1 further comprising amplifying the first frequency band of a signal on the first path with a first amplifier. ### Claim 3 (depends on 2) The method of claim 2 wherein the first amplifier causes a phase-shift at the second frequency band. ### Claim 4 (depends on 3) The method of claim 3 wherein the phase-shift of the first phase-shifting component is based on a phase-shift caused by reverse propagation through the first amplifier and forward propagation through the first amplifier. ### Claim 5 (depends on 2) The method of claim 2 further comprising phase-shifting a third frequency band of the signal passing through the first phase-shift component using the first phase-shifting component, a phase-shift at the third frequency band of the first phase-shifting component based on a phase-shift caused by the first amplifier at the third frequency band. ### Claim 6 (depends on 1) The method of claim 1 further comprising amplifying the second frequency band of a signal on the second path with a second amplifier. ### Claim 7 (depends on 6) The method of claim 6 further comprising phase-shifting the first frequency band of a signal passing through the second phase-shift component using the second phase-shift component, a phase-shift at the first frequency band of the second phase-shift component based on a phase-shift caused by the second amplifier at the first frequency band. ### Claim 8 (depends on 7) The method of claim 7 wherein the phase-shift at the first frequency band of the second phase-shifting component is based on a phase-shift caused by reverse propagation through the second amplifier and forward propagation through the second amplifier. ### Claim 9 (depends on 1) The method of claim 1 further comprising splitting an input signal received at an input of the receiving system into a first signal at the first frequency band propagated along the first path and a second signal at the second frequency band propagated along the second path. ### Claim 10 (depends on 9) The method of claim 9 further comprising combining the first signal and the second signal. ### Claim 11 (depends on 1) The method of claim 1 wherein activating the one or more paths includes enabling or disabling amplifiers disposed along the one or more paths. ### Claim 12 (depends on 1) The method of claim 1 wherein the phase-shift at the second frequency band of the first phase-shift component is configured so that an initial signal propagated along the second path and a reflected signal propagated along the first path are at least partially in-phase. ### Claim 13 (depends on 12) The method of claim 12 wherein the phase-shift at the second frequency band of the first phase-shift component is configured so that an amplitude of a sum of an initial signal and the reflected signal is greater than an amplitude of the initial signal. ### Claim 14 A method for phase-shifting signals in a receiving system, the method comprising: receiving a band select signal indicating one or more frequency bands; activating one or more of a plurality of paths through the receiving system based on the band select signal, the plurality of paths including a first path corresponding to a first frequency band and a second path corresponding to a second frequency band; sending a tuning signal to a first phase-shifting component on the first path and to a second phase-shifting component on the second path; and phase-shifting the second frequency band of a signal on the first path using the first phase-shifting component such that a first initial signal propagated along the second path and a first reflected signal propagated along the first path are at least partially in-phase. ### Claim 15 (depends on 14) The method of claim 14 further comprising amplifying the first frequency band of a signal on the first path with a first amplifier. ### Claim 16 (depends on 15) The method of claim 15 wherein the first amplifier causes a phase-shift at the second frequency band. ### Claim 17 (depends on 14) The method of claim 14 wherein further comprising phase-shifting the second frequency band of a signal on the second path using the second phase-shifting component such that a second initial signal propagated along the first path and a second reflected signal propagated along the second path are at least partially in-phase. ### Claim 18 (depends on 14) The method of claim 14 further comprising phase-shifting a third frequency band of a signal on the first path using the first phase-shifting component such that a third initial signal propagated along a third path of the plurality of paths corresponding to the third frequency band and a third reflected signal propagated along the first path are at least partially in-phase. ### Claim 19 (depends on 14) The method of claim 14 wherein the phase-shift at the second frequency band of the first phase-shift component is configured so that the first initial signal and the first reflected signal have a phase difference of an integer multiple of 360 degrees. ### Claim 20 (depends on 14) The method of claim 14 further comprising decreasing at least one of an out-of-band noise figure or an out-of-band gain of signals propagating along the one or more activated paths.