Patent ID: 8681665

Claim:
A radio transceiver, comprising: a transmitter and a receiver; a transmit filter coupled to an output of the transmitter, the transmit filter comprised of one or more integrated capacitors, where the transmit filter is tuned by varying one or more capacitance values of the one or more integrated capacitors in the transmit filter to tune the transmit filter, at least one of the one or more integrated capacitors comprise Barium Strontium Titanate (BST) ceramic integrated capacitors that are each tuneable by application of a bias voltage thereto; a filter tuner circuit comprising a receive filter configured to receive transmitter signals present at a receiver input; a power calculator configured to calculate power received from the receive filter; an error calculator configured to calculate a difference between the calculated power and receive frequency power present at the receiver input, wherein the filter tuner circuit is configured to apply the bias voltage to the one or more integrated capacitors, where the bias voltage is initially established as a stored initial value; and a proportional-integral-derivative (PID) controller, where the PID controller is configured to refine the bias voltage to maximize a difference between the receiver frequency power and transmitter frequency power at the receiver input.