Patent ID: 7113754

Claim:
A signal power detector comprises: an input coupling circuit operably coupled to receive a signal and to convert the signal into a first input and a rectifying input; a rectifying operational amplifier including: first input transistor operably coupled to receive the first input; second input transistor; rectifying transistor operably coupled to receive the rectifying input; current source operably coupled to provide a reference current to the first input transistor, second input transistor, and the rectifying transistor; first active input load transistor operably coupled to provide a first active load for the first input transistor and the rectifying transistor; second active input load transistor operably coupled to provide a second active load for the second transistor; active output load transistor operably coupled to mirror the reference current; and output transconductance stage operably coupled to the active load transistor and to the first input transistor and the rectifying transistor, wherein the output transconductance stage provides a rectified output representing a peak value of the signal; and a charge pump operably coupled to convert the rectified output into a corresponding current, wherein the corresponding current represents power of the signal.