# US 10,312,951 B2 · Circuitry and method for controlling a power amplifier in a transmit/receive switching system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,312,951 B2 - Document ID: US10312951B2 - Status: Granted - Kind: B2 - Application number: 16/065,919 - Filed: 2016-01-25 - Published: 2019-01-17 - Granted: 2019-06-04 - Earliest claimed: 2016-01-25 - Assignees: Telefonaktiebolaget LM Ericsson (publ) - Applicants: Telefonaktiebolaget LM Ericsson (publ) - Inventors: Xiaolong Yue; Lei Zhang; Zhanyu Wu; Jiangyan Peng - Web page: https://patentgrep.com/patent/US10312951B2 ## CPC - H04B 1/04: Circuits - H03F 1/0211: {with control of the supply voltage or current} - H03F 3/19: with semiconductor devices only - 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 1/44: Transmit/receive switching - H03F 2200/451: the amplifier being a radio frequency amplifier - H04B 2001/0408: {with power amplifiers} - H04B 2001/0416: {having gain or transmission power control} - H04B: TRANSMISSION - H03F: AMPLIFIERS ## Abstract According to embodiments of the present disclosure, circuitry (400, 600) and method (800) are provided for controlling a power amplifier (10) in a transmit/receive switching system. The circuitry (400, 600) comprises a load circuit (420, 620) for at least partly reducing a magnitude of a swing of a power supply voltage caused by a variation in load of the transmit/receive switching system that occurs upon initiation of a transmission by the transmit/receive switching system. The circuitry (400, 600) further comprises a first switch (410, 610), coupled in series with the load circuit (420, 620), operable to switch on to couple the power supply voltage to a ground voltage via the load circuit (420, 620). The circuitry (400, 600) further comprises a control circuit (430, 630) configured to switch on the first switch (410, 610) at a first timing, and to switch off the first switch (410, 610) and turn on the power amplifier (10) at a second timing. The first timing is a time interval ahead of the second timing. ## Claims ### Claim 1 Circuitry for controlling a power amplifier in a transmit/receive switching system, the circuitry comprising: a load circuit operable to at least partly reduce a magnitude of a swing of a power supply voltage of the power amplifier due to a variation in load of the transmit/receive switching system that occurs upon initiating transmission by the transmit/receive switching system; a first switch coupled in series with the load circuit and operable, when switched on, to couple the power supply voltage to a ground voltage via the load circuit; and a control circuit configured to: at a first timing, switch on the first switch; and at a second timing, wherein the first timing is a time interval ahead of the second timing: switch off the first switch; and turn on the power amplifier. ### Claim 2 (depends on 1) The circuitry according to claim 1, wherein the time interval is equal to or greater than a duration of the swing of the power supply voltage in absence of the circuitry. ### Claim 3 (depends on 2) The circuitry according to claim 2, wherein the duration of the swing of the power supply voltage is determined from a system configuration. ### Claim 4 (depends on 3) The circuitry according to claim 3, wherein the system configuration comprises at least one of: capacity of a power source supplying the power supply voltage; and a power consumption level of the power amplifier. ### Claim 5 (depends on 1) The circuitry according to claim 1, wherein the load circuit is equivalent to the power amplifier in terms of power consumption. ### Claim 6 (depends on 1) The circuitry according to claim 1, wherein the load circuit comprises a passive circuit, an active circuit, or combination thereof. ### Claim 7 (depends on 1) The circuitry according to claim 1, wherein the control circuit comprises: a second switch comprising a first terminal for being supplied with a disable voltage for turning off the power amplifier, a second terminal for being supplied with an enable voltage for turning on the power amplifier, and a common terminal for coupling to an enable terminal of the power amplifier; and a control device configured to: at the first timing, switch on the first switch; and at the second timing, switch off the first switch and turn on the power amplifier by causing the second switch to couple the common terminal to the second terminal instead of to the first terminal. ### Claim 8 (depends on 1) The circuitry according to claim 1, wherein the control circuit comprises: a third switch comprising a first terminal for being supplied with an enable voltage for turning on the power amplifier age and a second terminal for coupling to the enable terminal of the power amplifier; and a control device configured to: at the first timing, switch on the first switch; and at the second timing, switch off the first switch and turn on the power amplifier by switching on the third switch. ### Claim 9 (depends on 7) The circuitry according to claim 7, wherein the control circuit comprises: a voltage generator configured to supply, to the enable terminal of the power amplifier, one of an enable voltage for turning on the power amplifier and a disable voltage for turning off the power amplifier; and a control device configured to: at the first timing, switch on the first switch; and at the second timing, switch off the first switch and turn on the power amplifier by causing the voltage generator to generate the enable voltage instead of the disable voltage. ### Claim 10 (depends on 9) The circuitry according to claim 9, wherein the voltage generator comprises a digital-to-analog converter. ### Claim 11 (depends on 1) A transmitter for use in a transmit/receive switching system, comprising: a power amplifier; and circuitry according to claim 1. ### Claim 12 (depends on 11) A transmit/receive switching system comprising a transmitter according to claim 11. ### Claim 13 (depends on 12) A base station comprising a transmit/receive switching system according to claim 12. ### Claim 14 A method for controlling a power amplifier, in a transmit/receive switching system, for at least partly reducing a magnitude of a swing of a power supply voltage of the power amplifier due to a variation in load of the transmit/receive switching system that can occur upon initiating transmission by the transmit/receive switching system, the method comprising: switching on a first switch at a first timing, the first switch being coupled in series with a load circuit and being operable to switch on to couple the power supply voltage to a ground voltage via the load circuit; and at a second timing, wherein the first timing is a time interval ahead of the second timing: switching off the first switch; and turning on the power amplifier. ### Claim 15 (depends on 14) The method according to claim 14, wherein the time interval is equal to or greater than a duration of the swing of the power supply voltage without performing the switching on and the switching off operations. ### Claim 16 (depends on 14) The method according to claim 14, wherein the load circuit is equivalent to the power amplifier in terms of power consumption. ### Claim 17 (depends on 14) The method according to claim 14, wherein turning on the power amplifier comprises causing a second switch to couple a common terminal of the second switch to a second terminal of the second switch instead of to a first terminal of the second switch, wherein: the first terminal is supplied with a disable voltage for turning off the power amplifier; the second terminal is supplied with an enable voltage for turning on the power amplifier; and the common terminal is coupled to an enable terminal of the power amplifier. ### Claim 18 (depends on 14) The method according to claim 14, wherein turning on the power amplifier comprises switching on a third switch, wherein the third switch comprises a first terminal supplied with the enable voltage and a second terminal for coupling to an enable terminal of the power amplifier. ### Claim 19 (depends on 14) The method according to claim 14, wherein turning on the power amplifier comprises causing a voltage generator to generate an enable voltage instead of a disable voltage, wherein the voltage generator is configured to supply an enable terminal of the power amplifier with either the enable voltage or the disable voltage. ### Claim 20 (depends on 19) The method according to claim 19, wherein the voltage generator comprises a digital-to-analog converter.