# US 7,746,291 B2 · RF reception system and integrated circuit with programmable impedance matching network and methods for use therewith > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,746,291 B2 - Document ID: US7746291B2 - Status: Granted - Kind: B2 - Application number: 11/700,808 - Filed: 2007-01-30 - Published: 2008-07-31 - Granted: 2010-06-29 - Earliest claimed: 2007-01-30 - Assignees: Broadcom Corporation - Inventors: Ahmadreza (Reza) Rofougaran - Web page: https://patentgrep.com/patent/US7746291B2 ## CPC - 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 1/0458: {Arrangements for matching and coupling between power amplifier and antenna or between amplifying stages (matching circuits in general H03H)} - H04B: TRANSMISSION ## Abstract An integrated circuit includes an on-chip antenna interface, coupled to an off-chip antenna interface having at least one off-chip impedance matching component, that forms a programmable impedance matching network with the at least one off-chip impedance matching component. The programmable impedance matching network is programmable based on a control signal. An RF receiver, coupled to the programmable impedance matching network, that generates inbound data in response to a received signal from the programmable impedance matching network. ## Claims ### Claim 1 A (radio frequency) RF reception system comprising: an off-chip antenna interface that includes: a filter coupleable to an antenna; at least one off-chip impedance matching component coupled to the bandpass filter; an integrated circuit that includes: an on-chip antenna interface, coupled to the off-chip antenna interface, that forms a programmable impedance matching network with the at least one off-chip impedance matching component, wherein the programmable impedance matching network is programmable based on a control signal; and an RF receiver, coupled to the programmable impedance matching network, that generates inbound data in response to a received signal from the programmable impedance matching network. ### Claim 2 (depends on 1) The RF reception system of claim 1 wherein the on-chip antenna interface includes: an adjustable impedance coupled to the at least one off-chip impedance matching component; and a control module, coupled to the adjustable impedance, that generates the control signal in response to a frequency selection signal to control the adjustable impedance to a first value. ### Claim 3 (depends on 2) The RF reception system of claim 2 wherein the RF receiver demodulates the received signal at a selected one of a plurality of carrier frequencies in response to the frequency selection signal. ### Claim 4 (depends on 3) The RF reception system of claim 3 wherein the filter passes less than all of the plurality of carrier frequencies. ### Claim 5 (depends on 1) The RF reception system of claim 1 wherein the programmable impedance matching network includes at least one adjustable reactive network element. ### Claim 6 (depends on 5) The RF reception system of claim 5 wherein the at least one adjustable reactive network element includes a plurality of fixed reactive network elements and a switching network for selectively coupling the plurality of fixed reactive network elements in response to the control signal. ### Claim 7 (depends on 6) The RF reception system of claim 6 wherein the switching network selects at least one of the plurality of fixed reactive network elements and that deselects the remaining ones of the plurality of fixed reactive network elements in response to the control signal. ### Claim 8 (depends on 1) The RF reception system of claim 1 wherein the programmable impedance matching network includes a plurality of reactive network elements arranged in one of: and L-network configuration, a T-network configuration and a pi-network configuration. ### Claim 9 (depends on 1) The RF reception system of claim 1 wherein the integrated circuit is a voice, data and RF integrated circuit. ### Claim 10 A method comprising: generating, via a control module of an integrated circuit, a frequency selection signal; adjusting via the control module of the integrated circuit, a programmable impedance matching network coupled to an antenna, the frequency selection signal and a bandpass filter, the programmable impedance matching network formed by at least one off-chip impedance matching component and an on-chip adjustable impedance, by adjusting the on-chip adjustable impedance to a first value based on the frequency selection signal. ### Claim 11 (depends on 10) The method of claim 10 wherein the integrated circuit includes a receiver and wherein the method further comprises: processing, via the receiver, an inbound RF signal received by the antenna through the band pass filter and the programmable impedance matching network, to form a received signal; and generating, via the receiver, inbound data in response to the received signal. ### Claim 12 (depends on 11) The method of claim 11 wherein the step of generating inbound data includes demodulating the received signal at a selected one of a plurality of carrier frequencies in response to the frequency selection signal. ### Claim 13 An integrated circuit comprising: an on-chip antenna interface, coupled to an off-chip antenna interface having at least one off-chip impedance matching component, that forms a programmable impedance matching network with the at least one off-chip impedance matching component, wherein the programmable impedance matching network is programmable based on a control signal; and an RF receiver, coupled to the programmable impedance matching network, that generates inbound data in response to a received signal from the programmable impedance matching network. ### Claim 14 (depends on 13) The integrated circuit of claim 13 wherein the on-chip antenna interface includes: an adjustable impedance coupled to the at least one off-chip impedance matching component; and a control module, coupled to the adjustable impedance, that generates the control signal in response to a frequency selection signal to control the adjustable impedance to a first value. ### Claim 15 (depends on 14) The integrated circuit of claim 14 wherein the RF receiver demodulates the received signal at a selected one of a plurality of carrier frequencies in response to the frequency selection signal. ### Claim 16 (depends on 13) The integrated circuit of claim 13 wherein the programmable impedance matching network includes at least one adjustable reactive network element. ### Claim 17 (depends on 16) The integrated circuit of claim 16 wherein the at least one adjustable reactive network element includes a plurality of fixed reactive network elements and a switching network for selectively coupling the plurality of fixed reactive network elements in response to the control signal. ### Claim 18 (depends on 17) The integrated circuit of claim 17 wherein the switching network selects at least one of the plurality of fixed reactive network elements and that deselects the remaining ones of the plurality of fixed reactive network elements in response to the control signal. ### Claim 19 (depends on 14) The integrated circuit of claim 14 wherein the programmable impedance matching network includes a plurality of reactive network elements arranged in one of: and L-network configuration, a T-network configuration and a pi-network configuration. ### Claim 20 (depends on 14) The integrated circuit of claim 14 wherein the integrated circuit is a voice, data and RF integrated circuit.