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Transimpedance Amplifier (TIA) with Coupled Inductor in the Feedback Path for Bandwidth Enhancement

IP.com Disclosure Number: IPCOM000016006D
Original Publication Date: 2002-Aug-27
Included in the Prior Art Database: 2003-Jun-21

Publishing Venue

IBM

Abstract

Abstract This proposal describes a new method for broadening the bandwidth of a shunt-shunt feedback-type transimpedance amplifier by applying a coupled inductor in the feedback path. The inductive coupling occurs between the inductor in the feedback path and an inductor used for shunt or series peaking [1] (in the following series peaking is assumed). Introduction The block diagram of a typical optical receiver front-end is shown in Fig. 1. It consists of a reverse biased photodiode (PD), a transimpedance amplifier (TIA), a limiting amplifier (LA) and a clock and data recovery (CDR) circuit with decision (DEC) unit. The PD delivers an output current that is proportional to the optic power. The TIA acts as current-to-voltage converter and the LA receives the small voltage signal from the TIA and amplifies it to a level sufficient for a reliable operation of the CDR circuit.