Patent ID: 7215191
Filing Date: 2007-05-08
Classification: H03G,H03K

Abstract:
1. A full-wave rectifier circuit which performs full-wave rectification on an input signal of an input terminal so as to produce a full-wave rectified signal, said full-wave rectifier circuit, comprising: an inversion amplifier; an amplifier; and an output circuit which produces the full-wave rectified signal in response to an output signal of the inversion amplifier and an output signal of the amplifier, so as to output the full-wave rectified signal to an output terminal as an output signal, wherein the inversion amplifier includes: wherein the amplifier includes: wherein the output signal of the output terminal is subjected to negative feedback to the first gate and the sixth gate, and wherein the input signal of the input terminal is supplied to the fifth gate and is supplied to the first fate via the first resistor, so that a first gate voltage is supplied to the ninth gate while a second gate voltage whose phase is inverse to a phase of the first gate voltage is supplied to the tenth gate, whereby a current corresponding to one of the first gate voltage and the second gate voltage is forced to selectively flow through one of the ninth field-effect transistor and the tenth field-effect transistor, so that the full-wave rectified signal whose level is lower than a level of the reference voltage is produced and is output to the output terminal as the output signal.