CMOS amplifier with Chopper Stabilization and Offset Calibration

2020 ◽  
Author(s):  
Yuriy Agrich ◽  
Vadim Lifshits ◽  
Yuriy Pavlyuk ◽  
Ilya Gureev ◽  
Daniil Vorobyev
Keyword(s):  
Chopper Stabilization ◽  
Cmos Amplifier

scholarly journals High-CMRR Low-Noise Fully Integrated Front-End for EEG Acquisition Systems

Electronics ◽  
2019 ◽  
Vol 8 (10) ◽  
pp. 1157 ◽  
Author(s):  
Robert Chebli ◽  
Mohamed Ali ◽  
Mohamad Sawan
Keyword(s):  
Low Noise ◽  
Common Mode ◽  
Fully Integrated ◽  
Dc Offset ◽  
Chopper Stabilization ◽  
Logarithmic Amplifier ◽  
Offset Voltage ◽  
High Cmrr ◽  
Programmable Gain ◽  
Stabilization Technique

We present in this paper a fully integrated low-noise high common-mode rejection ratio (CMRR) logarithmic programmable gain amplifier (LPGA) and chopped LPGA circuits for EEG acquisition systems. The proposed LPGA is based on a rail-to-rail true logarithmic amplifier (TLA) stage. The high CMRR achieved in this work is a result of cascading three amplification stages to construct the LPGA in addition to the lower common-mode gain of the proposed logarithmic amplification topology. In addition, the 1 / f noise and the inherent DC offset voltage of the input transistors are reduced using a chopper stabilization technique. The CMOS 180 nm standard technology is used to implement the circuits. Experimental results for the integrated LPGA show a CMRR of 140 dB, a differential gain of 37 dB, an input-referred noise of 0.754 μ Vrms, a 189 μ W power consumption from 1.8 V power supply and occupies an active area of 0.4 mm 2 .

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