A Tunable High-Gain Low-Noise Transimpedance Amplifier for Biosensing
A low-noise transimpedance amplifier with tunable high gain is presented in this paper. It uses an improved two-stage topology in order to increase the design flexibility in gain- bandwidth and gain-noise trade-offs. The pseudo-resistor is used to reach ultra-high gain. The circuit dissipates 183µW from a 1.8V supply using standard 0.18µm CMOS 1P6M technology and it accomplishes 2.75MHz bandwidth with 160dB gain, 20.9kHz bandwidth with 220dB gain, nearly 0° phase shift in passband and 42fA/sqrt(Hz) input-referred current noise at 20kHz. The proposed transimpedance amplifier provides a perfect solution aimed for biosensing and optical interfacing where low noise and high gain are needed.
Y. He et al., "A Tunable High-Gain Low-Noise Transimpedance Amplifier for Biosensing," Proceedings of the 63rd International Midwest Symposium on Circuits and Systems, pp. 1007-1010, Institute of Electrical and Electronics Engineers (IEEE), Sep 2020.
The definitive version is available at https://doi.org/10.1109/MWSCAS48704.2020.9184435
IEEE 63rd International Midwest Symposium on Circuits and Systems, MWSCAS 2020 (2020: Aug. 9-12, Virtual)
Electrical and Computer Engineering
Keywords and Phrases
Low Noise; Pseudoresistor; Transimpedance Amplifier
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International Standard Serial Number (ISSN)
Article - Conference proceedings
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02 Sep 2020