University of Tabriz Tabriz Journal of Electrical Engineering 2008-7799 54 3 2024 11 21 A Low-Noise Low-Power Chopper Amplifier With 130dB CMRR and High SNR A Low-Noise Low-Power Chopper Amplifier With 130dB CMRR and High SNR 347 353 17413 10.22034/tjee.2024.58091.4699 FA M. Forghani Faculty of Electrical Engineering, Sahand University of Technology, Sahand New Town, Tabriz, Iran. H. Faraji Baghtash Faculty of Electrical Engineering, Sahand University of Technology, Sahand New Town, Tabriz, Iran. Journal Article 2023 08 23 This paper presents a low-power and low-noise chopper amplifier for biopotential signals. A two-stage structure is presented to achieve a high CMRR and SNR. These stages contain a folded cascode topology to obtain a low input noise and large input impedance; and a stage of two stacked cross-coupled folded cascode for CMRR and SNR intents. The structure consumes 1.27 µW from a 0.6 V power supply. The CMRR, SNR, Gain, and input-referred noise RMS respectively are 133 dB, 121.4 dB, 38 dB and 930nV/Hz in the Bandwidth of 0.01 kHz to 1 kHz. The NEF and PEF are 1.8 and 1.9 and input impedance is 2.5 GΩ with chopping frequency of 2kHz. This paper presents a low-power and low-noise chopper amplifier for biopotential signals. A two-stage structure is presented to achieve a high CMRR and SNR. These stages contain a folded cascode topology to obtain a low input noise and large input impedance; and a stage of two stacked cross-coupled folded cascode for CMRR and SNR intents. The structure consumes 1.27 µW from a 0.6 V power supply. The CMRR, SNR, Gain, and input-referred noise RMS respectively are 133 dB, 121.4 dB, 38 dB and 930nV/Hz in the Bandwidth of 0.01 kHz to 1 kHz. The NEF and PEF are 1.8 and 1.9 and input impedance is 2.5 GΩ with chopping frequency of 2kHz. https://tjee.tabrizu.ac.ir/article_17413_82d4e94256269374608e3643ea591c3d.pdf