Full-wave rectifier using f.e.t. switches

A circuit is described which allows full-wave rectification of from 1.5mV to 5V in amplitude, and from 0 to 200 kHz in frequency. A bridge arrangement is used, with four field-effect transistors connected in the arms of the bridge and switched by the output of a comparator circuit which is used to detect the `zero crossing¿ point on the input-signal waveform.