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Broad-band design techniques for transimpedance amplifiers

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Broad-band design techniques for transimpedance amplifiers

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Title: Broad-band design techniques for transimpedance amplifiers
Author: Lu, Zhenghao; Yeo, Kiat Seng; Ma, Jianguo; Do, Manh Anh; Lim, Wei Meng; Chen, Xueying
Copyright year: 2007
Abstract: In this paper, a novel bandwidth enhancement technique based on the combination of capacitive degeneration, broad-band matching network, and the regulated cascode (RGC) input stage is proposed and analyzed, which turns the transimpedance amplifier (TIA) design into a fifth-order low-pass filter with Butterworth response. This broad-band design methodology for TIAs is presented with an example implemented in CHRT 0.18-mum 1.8-V RF CMOS technology. Measurement data shows a -3-dB bandwidth of about 8 GHz with 0.25-pF photodiode capacitance. Comparing with the core RGC TIA without capacitive degeneration and broad-band matching network, this design achieves an overall bandwidth enhancement ratio of 3.6 with very small gain ripple. The transimpedance gain is 53 dBOmega with a group delay of 80plusmn20 ps. The chip consumes only 13.5-mW dc power and the measured average input-referred noise current spectral density is 18 pA/radicHz up to 10 GHz.
Subject: DRNTU::Engineering::Electrical and electronic engineering::Electronic circuits.
Type: Journal Article
Series/ Journal Title: IEEE transactions on circuits and systems I
Rights: IEEE
Version: Published version

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