A single-ended CMOS chopper amplifier for 1/f noise reduction of n-channel MOS transistors

IEICE Electronics Express

Shoji Kawahito¹  Kamel Mars² 

[1] Research Institute of Electronics, Shizuoka University;Graduate School of science and Technology, Shizuoka University

关键词: chopping;    low noise;    1/f noise reduction;   

DOI  :  10.1587/elex.9.98

学科分类：电子、光学、磁材料

来源: Denshi Jouhou Tsuushin Gakkai

【 摘 要 】

References(5)This paper describes a single-ended CMOS chopper amplifier for 1/f noise reduction of n-channel MOS transistors and its application to a low-noise high-gain switched-capacitor (SC) amplifier for sensor interface circuits. Since the chopping is used inside of the operational transconductance amplifier (OTA), this amplifier can be used for high output impedance sensors. To investigate the effect of the proposed chopping technique, a test chip was fabricated using 0.25µm mixed-signal CMOS process. The total input-referred noise is greatly reduced by using a high chopping frequency of 256kHz to 20µVrms from 295µVrms without chopping.

【 授权许可】

Unknown