Research PaperNo Access

Design and Analysis of Active Feedback RGC-Based Transimpedance Receiver Circuit for Optical Interconnects

Electronics and Communication Engineering Department, Thapar Institute of Engineering and Technology, Bhadson Road, Patiala 147001, India

E-mail Address: abharee_phd17@thapar.edu

Corresponding author.

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Karmjit Singh Sandha

https://orcid.org/0000-0001-6898-8471

Electronics and Communication Engineering Department, Thapar Institute of Engineering and Technology, Bhadson Road, Patiala 147001, India

E-mail Address: kssandha@thapar.edu

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, and

Mayank Kumar Rai

https://orcid.org/0000-0001-5141-6629

Electronics and Communication Engineering Department, Thapar Institute of Engineering and Technology, Bhadson Road, Patiala 147001, India

E-mail Address: mkrai@thapar.edu

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https://doi.org/10.1142/S0218126624501251Cited by:2 (Source: Crossref)

Abstract

A Transimpedance amplifier (TIA)-based optical receiver in active voltage-current feedback topology is designed for optical interconnects at 0.18 $μ m$ $μ m$ CMOS technology. The proposed inductorless TIA incorporates a gain boosting amplifier in its path to achieve high gain and bandwidth. This gain boosting amplifier is based on a regulated gain cascode (RGC) amplifier. The RGC stage raises the $g_{m}$ $g_{m}$ of the circuit, reducing the input resistance of the input stage; as a result, the bandwidth extends. To further amplify the gain, a common source (CS) stage is used at the output without much effect on the system’s overall bandwidth. An analytical model of the proposed TIA is developed and later simulated at room temperature in the Cadence Virtuoso analog design environment. The pre-layout and post-layout simulation results of the proposed TIA have been shown to validate its performance. It achieves a transimpedance gain of 62 $d B Ω$ $d B Ω$ while consuming power of 14.5 mW from a 1.8 V supply voltage. The bandwidth is extended to 8.2 GHz from 1.83 GHz with an input photodiode capacitance of 300 fF. The current spectral density of input-referred noise is 31 pA/ $\sqrt{} H z$ $\sqrt{} H z$ .

This paper was recommended by Regional Editor Giuseppe Ferri.

Keywords:

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