Standing wave ratio meter for integrated antenna tuner

摘要

The invention provides circuitry integrated into a silicon chip that measures aspects of an RF signal on a transmission line in order to provide data that is ultimately used by an antenna tuner circuit to substantially match the impedance of the antenna with that of the transmission line providing the RF frequency to be transmitted.

主权项

1. 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.