Mismatch detection using replica circuit

摘要

An apparatus for detecting an operating characteristic mismatch at an output of an amplifier by using a replica circuit is presented. In one exemplary case, a detected voltage difference at the output of the two circuits is used to drive a tuning control loop to minimize an impedance mismatch at the output of the amplifier. In another exemplary case, the replica circuit is used to detect a fault in operation in a corresponding main circuit. A method for detecting a load mismatch in a main RF circuit using the replica circuit is also presented.

主权项

1. An arrangement, comprising:
a sensing circuit; a first radio frequency (RF) path coupled to a first terminal of the sensing circuit, the first RF path comprising a first amplifying circuit; a second RF path coupled to a second terminal of the sensing circuit, the second RF path comprising a second amplifying circuit, the second amplifying circuit being a reduced size replica of the first amplifying circuit, wherein the sensing circuit is adapted to sense a difference between an operating characteristic of the first amplifying circuit and a reference operating characteristic of the second amplifying circuit.