A 1 V Low-Noise CMOS Amplifier Using Autozeroing and Chopper Stabilization Technique

Takeshi YOSHIDA  Yoshihiro MASUI  Takayuki MASHIMO  Mamoru SASAKI  Atsushi IWATA  

IEICE TRANSACTIONS on Electronics   Vol.E89-C   No.6   pp.769-774
Publication Date: 2006/06/01
Online ISSN: 1745-1353
DOI: 10.1093/ietele/e89-c.6.769
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Analog Circuit and Device Technologies)
low-noise amplifier,  autozeroing,  chopper stabilization,  low-voltage operation,  switched op-amp,  CMOS,  

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A low-noise CMOS amplifier operating at a low supply voltage is developed using the two noise reduction techniques of autozeroing and chopper stabilization. The proposed amplifier utilizes a feedback with virtual grounded input-switches and a multiple-output switched op-amp. The low-noise amplifier fabricated in a 0.18-µm CMOS technology achieved 50-nV/Hz input noise at 1-MHz chopping and 0.5-mW power consumption at 1-V supply voltage.