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Forty five nm CMOS low power multilevel active feedback transimpedance amplifier for optical receivers

Priya Singh (Department of Electronics and Communication, Indira Gandhi Delhi Technical University for Women, New Delhi, India)
Vandana Niranjan (Department of Electronics and Communication, Indira Gandhi Delhi Technical University for Women, New Delhi, India)
Ashwni Kumar (Department of Electronics and Communication, Indira Gandhi Delhi Technical University for Women, New Delhi, India)

Circuit World

ISSN: 0305-6120

Article publication date: 7 August 2021

Issue publication date: 5 April 2023

76

Abstract

Purpose

Recent advancements in the domain of smart communication systems and technologies have led to the augmented developments for very large scale integrated circuit designs in electro-magnetic applications. Increasing demands for low power, compact area and superior figure of merit–oriented circuit designs are the trends of the recent research studies. Hence, to accomplish such applications intended for optical communications, the transimpedance amplifier (TIA) was designed.

Design/methodology/approach

In this research work, the authors present a multi-layer active feedback structure which mainly composes a transimpedance stage and a gain stage followed by a low pass filter. This structure enables to achieve improved input impedance and superior gain. A simplified cascaded amplifier has also been designed in a hierarchical topology to improvise the noise effect further. The proposed TIA has been designed using Taiwan Semiconductor Manufacturing Company 45 nm complementary metal oxide semiconductor technology. Moreover, the thermal noise has been analyzed at −3 dB bandwidth to prove the reduction in thermal noise with increase in frequency for most of the devices used in the designed circuit.

Findings

The proposed differential TIA circuit was found to obtain the transimpedance gain of 50.1 dBO without applying any external bias current which is almost 8% improvised as compared to the conventional circuit. In addition to this, bandwidth achieved was 2.15 GHz along with only 38 W of power consumption, which is reasonably 100 times improvised in comparison of conventional circuit. Hence, the proposed differential TIA is suitable for the low power optical communications applications intended to work on low supply voltage.

Originality/value

The designed work is done by authors in university lab premises and is not copied from anywhere. To the best of the authors’ knowledge, it is 100% original.

Keywords

Citation

Singh, P., Niranjan, V. and Kumar, A. (2023), "Forty five nm CMOS low power multilevel active feedback transimpedance amplifier for optical receivers", Circuit World, Vol. 49 No. 2, pp. 125-137. https://doi.org/10.1108/CW-06-2020-0102

Publisher

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Emerald Publishing Limited

Copyright © 2021, Emerald Publishing Limited

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