Patent ID: 8897734

Claim:
RF transmission circuitry comprising: an integrated circuit comprising an impedance matching measuring circuit, the impedance matching measuring circuit comprising: an artificial transmission line comprising a plurality of inductors connected in series with a plurality of nodes such that there is a node located on either side of each inductor; a first variable attenuator connected to a first node of the plurality of nodes, the first variable attenuator being adapted to receive attenuation instructions and to attenuate a first voltage from the first node by a first stepped amount to provide a first attenuated voltage; a first detector circuit connected to receive the first attenuated voltage, the first detector adapted to provide a first detected voltage, the first detected voltage being either zero or a voltage relative to the first attenuated voltage; a second variable attenuator connected to a second node of the plurality of nodes, the second variable attenuator being adapted to receive the attenuation instructions and to attenuate a second voltage from the second node by a second stepped amount to provide a second attenuated voltage; a second detector circuit connected to receive the second attenuated voltage, the second detector adapted to provide a second detected voltage, the second detected voltage being either zero or a voltage relative to the second attenuated voltage; wherein the first detected voltage and the second detected voltage are adapted to aid in a determination of a tuner control setting adapted to substantially match an impedance; a controller configured to provide the attenuation instructions, receive the first and second detected voltage, and calculate the tuner control setting therefrom.