Patent ID: 8188904

Claim:
An RF front-end circuit comprising: a tunable matching network comprising an input coupled to an RF interface port; a directional coupler comprising a first connection coupled to an RF input of a mixer, a second connection coupled to an RF signal generation port, and a third connection coupled to an output of the tunable matching network, wherein the directional coupler is configured to direct a signal from the RF signal generation port to the tunable matching network and direct a signal from the tunable matching network to the RF input of the mixer; and a tunable matching network control unit coupled to the tunable matching network, the control unit configured to adjust an impedance match between the RF interface port and the output of the tunable matching network; and a reflection measurement unit coupled to the output of the tunable matching network and the tunable matching network control unit, wherein the control unit is configured to adjust the tunable matching network to reduce a reflection at the output of the tunable matching network based on measurements generated by the reflection measurement unit during operation of the RF front-end.