# US 8,570,887 B2 · Analog bias control for packet communication systems > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,570,887 B2 - Document ID: US8570887B2 - Status: Granted - Kind: B2 - Application number: 12/944,031 - Filed: 2010-11-11 - Published: 2011-05-19 - Granted: 2013-10-29 - Earliest claimed: 2009-11-19 - Assignees: Marvell World Trade Ltd. - Applicants: Thomas B. Cho; Li Lin; Mao Yu; Atul Salhotra - Inventors: Thomas B. Cho; Li Lin; Mao Yu; Atul Salhotra - Web page: https://patentgrep.com/patent/US8570887B2 ## CPC - H04L 27/0002: {analog front ends; means for connecting modulators, demodulators or transceivers to a transmission line (duplex arrangements H04L5/143)} - H03F 1/0272: {by using a signal derived from the output signal} - H03G 3/3068: {Circuits generating control signals for both R.F. and I.F. stages} - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H03F: AMPLIFIERS - H03G: CONTROL OF AMPLIFICATION ## Abstract Apparatus having corresponding methods and non-transitory computer-readable media comprise an amplifier configured to amplify signals according to a bias current, wherein the signals represent packets of data; a packet module configured to recover the packets of data from the signals amplified by the amplifier; and a control module configured to control the bias current according to one or more characteristics of the packets of data. ## Claims ### Claim 1 An apparatus comprising: an amplifier configured to amplify signals according to a bias current, wherein the signals represent packets of data, and wherein the amplifier includes a plurality of cascaded stages; a packet module configured to recover the packets of data from the signals amplified by the amplifier; and a control module configured to control the bias current by which the amplifier amplifies the signals, wherein the control module controls the bias current according to a signal-to-noise ratio (SNR), a received signal strength indication (RSSI), and a modulation type of each of the packets of data. ### Claim 2 (depends on 1) The apparatus of claim 1, further comprising: an SNR module to determine the signal-to-noise ratio (SNR) of one or more of the packets; an RSSI module to determine the received signal strength indication (RSSI) of one or more of the packets; and a modulation type module to determine the modulation type of one or more of the packets. ### Claim 3 (depends on 2) The apparatus of claim 2: wherein each of the packets includes a preamble; and wherein the SNR, the RSSI, and the modulation type are determined based on the preambles of the one or more packets. ### Claim 4 (depends on 3) The apparatus of claim 3: wherein the control module controls the bias current for amplifying a payload of each packet based on the preamble of the packet. ### Claim 5 (depends on 1) The apparatus of claim 1, further comprising: a receiver to receive the signals. ### Claim 6 (depends on 5) A communication device comprising the apparatus of claim 5. ### Claim 7 (depends on 6) The communication device of claim 6, wherein the signals are wireless signals, and wherein the communication device is compliant with all or part of IEEE standard 802.11, including draft and approved amendments 802.11a, 802.11b, 802.11e, 802.11g, 802.11i, 802.11k, 802.11n, 802.11v, and 802.11w. ### Claim 8 A method comprising: amplifying, at an amplifier having a plurality of cascaded stages, signals according to a bias current supplied to the plurality of cascaded stages of the amplifier, wherein the signals represent packets of data; recovering the packets of data from the signals as amplified by the amplifier; and controlling the bias current supplied to the plurality of cascaded stages of the amplifier according to a signal-to-noise ratio (SNR), a received signal strength indication (RSSI), and a modulation type of each of the packets of data. ### Claim 9 (depends on 8) The method of claim 8, further comprising: determining the signal-to-noise ratio (SNR) of one or more of the packets; determining the received signal strength indication (RSSI) of one or more of the packets; and determining the modulation type of one or more of the packets. ### Claim 10 (depends on 9) The method of claim 9: wherein each of the packets includes a preamble; and wherein the SNR, the RSSI, and the modulation type are determined based on the preambles of the one or more packets. ### Claim 11 (depends on 10) The method of claim 10: wherein the bias current for amplifying a payload of each packet is controlled based on the preamble of the packet. ### Claim 12 (depends on 8) The method of claim 8, further comprising: receiving the signals. ### Claim 13 (depends on 12) The method of claim 12, wherein the signals are wireless signals, and wherein the wireless signals are compliant with all or part of IEEE standard 802.11, including draft and approved amendments 802.11a, 802.11b, 802.11e, 802.11g, 802.11i, 802.11k, 802.11n, 802.11v, and 802.11w. ### Claim 14 Non-transitory computer-readable media embodying instructions executable by a computer to perform a method comprising: controlling a bias current supplied to a plurality of cascaded stages of an amplifier, the bias current being controlled according to a signal-to-noise ratio (SNR), a received signal strength indication (RSSI), and a modulation type of each of a plurality of packets of data, wherein the packets of data are recovered from signals, amplified according to the bias current supplied to the plurality of cascaded stages of the amplifier. ### Claim 15 (depends on 14) The non-transitory computer-readable media of claim 14, wherein the method further comprises: determining the signal-to-noise ratio (SNR) of one or more of the packets; determining the received signal strength indication (RSSI) of one or more of the packets; and determining the modulation type of one or more of the packets. ### Claim 16 (depends on 15) The non-transitory computer-readable media of claim 15: wherein each of the packets includes a preamble; and wherein the SNR, the RSSI, and the modulation type are determined based on the preambles of the one or more packets. ### Claim 17 (depends on 16) The non-transitory computer-readable media of claim 16: wherein the bias current for amplifying a payload of each packet is controlled based on the preamble of the packet. ### Claim 18 (depends on 14) The non-transitory computer-readable media of claim 14, wherein the signals are wireless signals, and wherein the wireless signals are compliant with all or part of IEEE standard 802.11, including draft and approved amendments 802.11a, 802.11b, 802.11e, 802.11g, 802.11i, 802.11k, 802.11n, 802.11v, and 802.11w.