A Modified Regulated Cascode transimpedance amplifier with extra feed-forward path to enhance gain and bandwidth

Document Type : Original Article

Authors

1 Department of electrical engineering, Bu-Ali Sina University, Hamedan, Iran

2 Department of electrical engineering, Quchan University of technology, Quchan, Iran

Abstract

This paper presents a Transimpedance Amplifier (TIA) for high sensitivity Near Infrared Spectroscopy (NIRS). The proposed TIA is based on the Regulated Cascode (RGC) structure with an extra transistor employed to implement additional feed-forward path and achieve higher gain values. The extra transistor senses a partially amplified input signal, available in the conventional circuit, and conveys an additional ac current into the load, which provides a higher gain. In addition, a bandwidth extension method is introduced using a capacitor and resistor, which can improve amplifier’s bandwidth by 40%. The proposed TIA is designed in 0.18µm CMOS technology and achieves a transimpedance gain of 101.9dB with a -3dB bandwidth of 91.2 MHz considering 2pF of photodiode capacitance at the TIA input. The input referred noise is 4.4pA/√Hz while dissipating 151µW power.

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References

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TABRIZ JOURNAL OF ELECTRICAL ENGINEERING
Volume 53, Issue 3
October 2023
Pages 235-243

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