# US 7,609,781 B2 · Wireless communication device with self calibration feature for controlling power output > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,609,781 B2 - Document ID: US7609781B2 - Status: Granted - Kind: B2 - Application number: 11/427,800 - Filed: 2006-06-30 - Published: 2008-01-03 - Granted: 2009-10-27 - Earliest claimed: 2006-06-30 - Assignees: ST-Ericsson SA - Inventors: Donald A. Kerth; Srinath Sridharan - Web page: https://patentgrep.com/patent/US7609781B2 ## CPC - H04W 52/52: using AGC [Automatic Gain Control] circuits or amplifiers - H04B 17/13: of power amplifiers, e.g. gain or non-linearity - H04W 52/04: Transmission power control [TPC] - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04B: TRANSMISSION ## Abstract A wireless communication device is disclosed which employs a minimal number of power calibrations to set the output power of the device to a specified output power level. In one embodiment, the disclosed communication device includes a self calibrating feature that sets the output power level during initialization of the device. ## Claims ### Claim 1 A method of calibrating the gain of a transmitter, comprising: providing a ramp signal to a transmitter including first and second stages, the ramp signal exhibiting a predetermined value among a range of values; adjusting, by the first stage, a reference signal to exhibit a reference signal value that is approximately equal to the ramp signal predetermined value, the reference signal value and the ramp signal value controlling the gain of the first stage; and adjusting, by the second stage, power generated by the transmitter to a predetermined power level. ### Claim 2 (depends on 1) The method of claim 1, wherein the predetermined value of the ramp signal is a maximum value among the range of values. ### Claim 3 (depends on 1) The method of claim 1, wherein the range of values and the reference signal value are voltage values. ### Claim 4 (depends on 1) The method of claim 1, wherein the range of values and the reference signal value are current values. ### Claim 5 (depends on 1) The method of claim 1, wherein the first stage includes a variable gain attenuator. ### Claim 6 (depends on 1) The method of claim 1, wherein the second stage includes a variable gain mixer. ### Claim 7 (depends on 6) The method of claim 6, wherein the adjusting by the second stage step further comprises storing, in a memory, a second stage gain value that is found in the adjusting by the second stage step to correspond to the predetermined power level. ### Claim 8 (depends on 7) The method of claim 7, wherein the second stage gain value is a digital voltage gain amplifier word. ### Claim 9 (depends on 1) The method of claim 1, wherein the adjusting by the first stage step is performed during an initialization of the transmitter. ### Claim 10 (depends on 1) The method of claim 1, wherein the adjusting by the second stage step is performed during a factory calibration. ### Claim 11 A method of calibrating the gain of a transmitter, comprising: providing a ramp signal to a transmitter including first and second stages, the ramp signal exhibiting a predetermined value among a range of values; adjusting, by the first stage, a reference signal to exhibit a reference signal value that is approximately equal to the ramp signal predetermined value, the reference signal value and the ramp signal value controlling the gain of the first stage; adjusting, by the second stage, the gain of the second stage to determine a second stage gain value for which the transmitter generates output power equal to a predetermined power level; storing, in a memory, a word related to the second stage gain value; and retrieving, from the memory, the word for use in subsequent operation of the transmitter to set power output equal to the predetermined power level or a power level offset from the predetermined power level. ### Claim 12 (depends on 11) The method of claim 11, wherein the predetermined value of the ramp signal is a maximum value among the range of values. ### Claim 13 (depends on 11) The method of claim 11, wherein the range of values and the reference signal value are voltage values. ### Claim 14 (depends on 11) The method of claim 11, wherein the range of values and the reference signal value are current values. ### Claim 15 (depends on 11) The method of claim 11, wherein the first stage includes a variable gain attenuator. ### Claim 16 (depends on 11) The method of claim 11, wherein the second stage includes a variable gain mixer. ### Claim 17 (depends on 11) The method of claim 11, wherein the adjusting by the first stage step is performed during an initialization of the transmitter. ### Claim 18 (depends on 11) The method of claim 11, wherein the adjusting by the second stage step is performed during a factory calibration. ### Claim 19 (depends on 11) The method of claim 11, wherein the ramp signal exhibits a maximum voltage value among a range of voltage values that when applied to the first stage causes the first stage to exhibit unity gain. ### Claim 20 (depends on 11) The method of claim 11, wherein the ramp signal exhibits a maximum voltage value among a range of voltage values that when applied to the first stage causes the first stage to exhibit a minimum attenuation value among a range of attenuation values. ### Claim 21 A wireless communication device comprising: a baseband section; and a transmitter section, coupled to the baseband section, the transmitter section including a first stage coupled to a second stage, the baseband section supplying a ramp signal to the first stage, the ramp signal exhibiting a predetermined value among a range of values; the first stage including a reference signal generator that generates a reference signal that is adjusted to exhibit a reference signal value that is approximately equal to the ramp signal predetermined value, the reference signal value and the ramp signal value controlling the gain of the first stage; the second stage exhibiting adjustable gain wherein the second stage determines a second stage gain value for which the device generates output power equal to a predetermined power level. ### Claim 22 (depends on 21) The wireless communication device of claim 21, wherein the predetermined value of the ramp signal is a maximum value among the range of values. ### Claim 23 (depends on 21) The wireless communication device of claim 21, wherein the range of values and the reference signal value are voltage values. ### Claim 24 (depends on 21) The wireless communication device of claim 21, wherein the range of values and the reference signal value are current values. ### Claim 25 (depends on 21) The wireless communication device of claim 21, wherein the first stage includes a variable gain attenuator. ### Claim 26 (depends on 21) The wireless communication device of claim 21, wherein the second stage includes a variable gain mixer. ### Claim 27 (depends on 21) The wireless communication device of claim 21, further comprising a memory, coupled to the second stage, that stores a word related to the second stage gain value. ### Claim 28 (depends on 27) The wireless communication device of claim 27, wherein the second stage retrieves the word from the memory for use in subsequent operation of the wireless communication device to set power output equal to the predetermined power level or a power level offset from to the predetermined power level. ### Claim 29 (depends on 21) The wireless communication device of claim 21, further comprising an RF amplifier coupled to the transmitter section to provide an RF output signal.