公开(公告)号：US20170153279A1

公开(公告)日：2017-06-01

申请号：US15360196

申请日：2016-11-23

Applicant: Samsung Electronics Co., Ltd.

Inventor： Dae-Young CHUNG ,  Jae-Jin PARK ,  Dong-Hyuk LIM

IPC: G01R23/02 ,  G01R19/00 ,  H03D7/12 ,  H03F3/04 ,  H03K5/02

Abstract: A lock-in amplifier includes a clock signal generator configured to generate a first demodulation clock signal and a second demodulation clock signal having a phase difference of 90 degrees and a same demodulation frequency; and a detector configured to, based on an input signal, the first demodulation clock signal, and the second demodulation clock signal, provide an offset voltage corresponding to an offset of the lock-in amplifier in a first operation mode, and provide a first output voltage and a second output voltage, each of which correspond to a demodulation frequency component of the input signal in a second operation mode.