Low Noise and Low Distortion Telescopic OTA for Biomedical Signal Processing

Author(s): Z.M. Patel*.

Journal Name: Recent Advances in Electrical & Electronic Engineering
Formerly Recent Patents on Electrical & Electronic Engineering

Volume 12 , Issue 6 , 2019

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Abstract:

Background: This paper presents a low noise and low distortion telescopic operational trans-conductance amplifier (OTA) that is suited to biomedical signal processing. In our proposal, source degeneration using CMOS transmission gate is introduced in telescopic OTA to realize current- voltage negative feedback. The negative feedback degenerates Gm, reduces flicker noise and reduces distortion.

Methods: The circuit is simulated by using TSMC 90nm CMOS process technology with 1.8V supply voltage. We obtained promising simulation results that show THD less than -90dB and flicker noise 60 nV at 4kHz corner frequency.

Result: The frequency response plot reveals that our circuit offers a voltage gain of 63dB with negative feedback and achieves a phase margin of about 70 degrees. Thus, this topology is a feasible solution for low noise and low distortion biomedical signal amplifier circuits.

Conclusion: A highly linear and low noise telescopic OTA topology was proposed in this paper. A simple but efficient technique of source degeneration is used with negative feedback to achieve low distortion and low noise.

Keywords: Low distortion, source degeneration, flicker noise, telescopic OTA, THD, noise and nonlinearity.

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Article Details

VOLUME: 12
ISSUE: 6
Year: 2019
Page: [505 - 510]
Pages: 6
DOI: 10.2174/2352096511666180705115436
Price: $95