# US 2013/0278339 A1 · Power Control for Power Amplifiers > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2013/0278339 A1 - Document ID: US20130278339A1 - Status: Published application - Kind: A1 - Application number: 13/922,043 - Filed: 2013-06-19 - Published: 2013-10-24 - Earliest claimed: 2007-02-26 - Assignees: Broadcom Corporation - Applicants: Broadcom Corporation - Inventors: Ahmadreza Rofougaran - Web page: https://patentgrep.com/patent/US20130278339A1 ## CPC - H03F 3/45179: {using MOSFET transistors as the active amplifying circuit (H03F3/45278 takes precedence)} - H03F 1/0205: {in transistor amplifiers} - H03F 1/0211: {with control of the supply voltage or current} - H03F 3/245: {with semiconductor devices only} - H04B 1/0475: {with means for limiting noise, interference or distortion (H04B1/0483 takes precedence)} - H04B 1/0483: {Transmitters with multiple parallel paths} - H03F 2200/102: A non-specified detector of a signal envelope being used in an amplifying circuit - H03F 2200/321: Use of a microprocessor in an amplifier circuit or its control circuit - H03F 2200/324: An amplitude modulator or demodulator being used in the amplifier circuit - H03F 2203/45466: the CSC being controlled, e.g. by a signal derived from a non specified place in the dif amp circuit - H03F: AMPLIFIERS - H04B: TRANSMISSION ## Abstract Aspects of a system for improving efficiency over power control for linear and class AB power amplifiers may include a current source circuit that enables determination of a bias current level for a PA circuit within an IC die based on an amplitude of an input modulation signal. The PA circuit may enable generation of an output signal based on a differential input signal and the input modulation signal to the current source circuit. A generated bias voltage may be applied to a transformer external to the IC die, but internal to an IC package containing the IC die and/or a circuit board containing the IC package. One or more amplifier bias voltage levels may be applied to the PA circuit wherein the amplifier bias voltage levels may be derived from the generated bias voltage level and/or the determined bias current level. ## Claims ### Claim at position 1 1-70. (canceled) ### Claim 71 A wireless communication system comprising: a circuit that enables determination of a bias current for an amplifier in said wireless communication system based on an input modulation signal; said amplifier generating an output signal based on a differential input signal to said amplifier and said input modulation signal; wherein at least one amplifier bias voltage is derived from said bias current, and wherein said at least one amplifier bias voltage is applied to said amplifier. ### Claim 72 (depends on 71) The wireless communication system of claim 71, wherein said differential input signal comprises signal phase information. ### Claim 73 (depends on 71) The wireless communication system of claim 71, wherein said input modulation signal comprises signal amplitude information. ### Claim 74 (depends on 71) The wireless communication system of claim 71, wherein a phase of said output signal is based on said differential input signal. ### Claim 75 (depends on 71) The wireless communication system of claim 71, wherein an amplitude of said output signal is based on said input modulation signal. ### Claim 76 (depends on 71) The wireless communication system of claim 71, wherein a phase of said output signal is based on said differential input signal, and an amplitude of said output signal is based on said input modulation signal. ### Claim 77 (depends on 71) The wireless communication system of claim 71, wherein said differential input signal comprises signal phase information, and wherein said input modulation signal comprises signal amplitude information. ### Claim 78 (depends on 74) The wireless communication system of claim 74, wherein said differential input signal comprises signal phase information. ### Claim 79 (depends on 75) The wireless communication system of claim 75, wherein said differential input signal comprises signal phase information. ### Claim 80 (depends on 74) The wireless communication system of claim 74, wherein said input modulation signal comprises signal amplitude information. ### Claim 81 (depends on 75) The wireless communication system of claim 75, wherein said input modulation signal comprises signal amplitude information. ### Claim 82 (depends on 71) The wireless communication system of claim 71, wherein said input modulation signal is inputted to a current supply. ### Claim 83 (depends on 82) The wireless communication system of claim 82, wherein said current supply generates said bias current. ### Claim 84 A method for amplifying signals in a wireless communication system, said method comprising: determining a bias current for an amplifier based on an input modulation signal; generating an output signal from said amplifier based on a differential input signal to said amplifier and said input modulation signal; deriving at least one amplifier bias voltage from said bias current; applying said at least one amplifier bias voltage to said amplifier. ### Claim 85 (depends on 82) The method of claim 82, wherein said differential input signal comprises signal phase information. ### Claim 86 (depends on 82) The method of claim 82, wherein said input modulation signal comprises signal amplitude information. ### Claim 87 (depends on 82) The method of claim 82, wherein a phase of said output signal is based on said differential input signal. ### Claim 88 (depends on 82) The method of claim 82, wherein an amplitude of said output signal is based on said input modulation signal. ### Claim 89 (depends on 82) The method of claim 82, further comprising providing said input modulation signal to a current supply. ### Claim 90 (depends on 89) The method of claim 89, wherein said current supply generates said bias current.