High-frequency RMS-DC converter using chopper-stabilized square cells

摘要

An RMS-DC converter includes a chopper-stabilized square cell that eliminates offset, thus enabling high-bandwidth operation. The chopper-stabilized offset requires only a small portion of the circuitry (i.e., a single component square cell) which operates at high frequencies, and is amenable to using high-bandwidth component square cells. Using the chopping technique minimizes required device sizes without compromising an acceptable square cell dynamic range, thereby maximizing the square cell bandwidth. The RMS-DC converter consumes less power than conventional RMS-to-DC converters that requires a high-frequency variable gain amplifier.

主权项

1. An RMS-to-DC converter receiving an input signal and providing a converter output signal, comprising:
a chopper-stabilized square cell receiving the input signal and a feedback signal to provide the converter output signal; a feedback circuit receiving the converter output signal and providing the feedback signal to the chopper-stabilized square cell; and a variable gain amplifier that amplifies the converter output signal of the chopper-stabilized square cell, wherein the feedback circuit adjusts a gain of the variable gain amplifier.