Variable gain amplifier circuit, and a variable gain amplifier circuit communication device using a

摘要

PROBLEM TO BE SOLVED: To provide a variable gain amplifier circuit suppressing a gain deviation.;SOLUTION: The variable gain amplifier circuit includes a bypass switch SWb 13 of which one end is connected to a first connection node N1 between an input resistor Ri 10 of a first variable gain amplifier 11 and an input switch SWi 10, and another end is connected to an input end of an operational amplifier OP 3 of a second variable gain amplifier 13 disposed on the post-stage side of the first variable gain amplifier.;COPYRIGHT: (C)2013,JPO&INPIT