Patent ID: 7697909

Claim:
A RMS-to-DC converter comprising: a first feedback path for generating a first feedback signal; a second feedback path for generating a second feedback signal; a first multiplier circuit that is coupled to receive a first signal and a second signal, wherein the first signal is based on an input signal and the first feedback signal, wherein the second signal is based on the input signal and the second feedback signal, the first multiplier circuit being further coupled to provide a third signal based on multiplying the first signal and the second signal; and a first chopper circuit that is coupled to receive an output signal and a first chopping signal, wherein the output signal is based on the third signal, the first chopper circuit being further coupled to provide a fourth signal to the first and second feedback paths, wherein the fourth signal is based on multiplying the output signal with the first chopping signal, wherein the fourth signal represents the output signal shifted to a frequency different than that of a low-frequency noise component of the first signal and a low-frequency noise component of the second signal.