Transimpedance Amplifier (TIA) with Coupled Inductor in the Feedback Path for Bandwidth Enhancement
Original Publication Date: 2002-Aug-27
Included in the Prior Art Database: 2003-Jun-21
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  (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.