# US 2018/0027503 A1 · High-frequency signal processing apparatus and wireless communication apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0027503 A1 - Document ID: US20180027503A1 - Status: Published application - Kind: A1 - Application number: 15/720,188 - Filed: 2017-09-29 - Published: 2018-01-25 - Earliest claimed: 2011-12-28 - Assignees: Murata Manufacturing Co., Ltd. - Applicants: Murata Manufacturing Co., Ltd. - Inventors: Satoshi Tanaka; Kiichiro Takenaka; Takayuki Tsutsui; Taizo Yamawaki; Shun Imai - Web page: https://patentgrep.com/patent/US20180027503A1 ## CPC - H04W 52/246: {where the output power of a terminal is based on a path parameter calculated in said terminal} - H03F 1/0216: {Continuous control} - H03F 1/0227: {using supply converters} - H03F 1/0277: {Selecting one or more amplifiers from a plurality of amplifiers} - H03F 3/189: High-frequency amplifiers, e.g. radio frequency amplifiers - H03F 3/19: with semiconductor devices only - H03F 3/21: with semiconductor devices only {(H03F3/245 takes precedence)} - H03F 3/24: of transmitter output stages - H04B 1/0475: {with means for limiting noise, interference or distortion (H04B1/0483 takes precedence)} - H04W 52/0251: {using monitoring of local events, e.g. events related to user activity} - H04W 52/0261: {managing power supply demand, e.g. depending on battery level} - H03F 2200/102: A non-specified detector of a signal envelope being used in an amplifying circuit - H03F 2200/294: the amplifier being a low noise amplifier [LNA] - H03F 2200/504: the supply voltage or current being continuously controlled by a controlling signal, e.g. the controlling signal of a transistor implemented as variable resistor in a supply path for, an IC-block showed amplifier - H04W 88/06: adapted for operation in multiple networks {or having at least two operational modes}, e.g. multi-mode terminals - Y02D 30/70: in wireless communication networks - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H03F: AMPLIFIERS - H04B: TRANSMISSION - Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE ## Abstract A high-frequency signal processing apparatus and a wireless communication apparatus can achieve a decrease in power consumption. For example, when an indicated power level to a high-frequency power amplifier is equal to or greater than a second reference value, envelope tracking is performed by causing a source voltage control circuit to control a high-speed DCDC converter using a detection result of an envelope detecting circuit and causing a bias control circuit to indicate a fixed bias value. The source voltage control circuit and the bias control circuit indicate a source voltage and a bias value decreasing in proportion to a decrease in the indicated power level when the indicated power level is in a range of the second reference value to the first reference value, and indicate a fixed source voltage and a fixed bias value when the indicated power level is less than the first reference value. ## Claims ### Claim 1 A wireless communication apparatus comprising: a first power amplifying circuit configured to amplify a first input signal and output a first output signal; and first and second operation modes, wherein the first power amplifying circuit is configured to: receive a first source voltage increasing in proportion to an increase of an average power level of the first output signal in the first operation mode, and receive a second source voltage having a fixed voltage value in the second operation mode, wherein the first power amplifying circuit is configured to: receive a first bias increasing in proportion to the increase of the average power level in the first operation mode, and receive a second bias having a first fixed value in the second operation mode, wherein the first operation mode is performed when the average power level is equal to or greater than a first reference value, and wherein the second operation mode is performed when the average power level is smaller than the first reference value. ### Claim 2 (depends on 1) The wireless communication apparatus according to claim 1, further comprising: an envelope detecting circuit configured to detect an envelope of the first input signal; and a third operation mode. ### Claim 3 (depends on 2) The wireless communication apparatus according to claim 2, further comprising first and second communication modes, wherein in the first communication mode, the first operation mode is performed when the average power level is equal to or greater than the first reference value and the second operation mode is performed when the average power level is smaller than the first reference value, and wherein in the second communication mode, the third operation mode is performed when the average power level is equal to or greater than a second reference value greater than the first reference value, the first operation mode is performed when the average power level is equal to or greater than the first reference value and smaller than the second reference value, and the second operation mode is performed when the average power level is smaller than the first reference value. ### Claim 4 (depends on 3) The wireless communication apparatus according to claim 3, wherein the first communication mode is for W-CDMA, and wherein the second communication mode is for LTE. ### Claim 5 (depends on 2) The wireless communication apparatus according to claim 2, wherein the envelope detecting circuit is implemented by calculating a magnitude of a vector sum of orthogonal baseband components corresponding to the first input signal.