Title :
Broad-Band Design Techniques for Transimpedance Amplifiers
Author :
Lu, Zhenghao ; Yeo, Kiat Seng ; Ma, Jianguo ; Do, Manh Anh ; Lim, Wei Meng ; Chen, Xueying
Author_Institution :
Div. of Circuits & Syst., Nanyang Technol. Univ., Singapore
fDate :
3/1/2007 12:00:00 AM
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
Keywords :
Butterworth filters; impedance matching; low-pass filters; wideband amplifiers; 0.18 micron; 0.25 pF; 1.8 V; 13.5 mW; Butterworth filters; RF CMOS technology; bandwidth enhancement technique; broadband design techniques; broadband matching network; capacitive degeneration; current spectral density; fifth-order low-pass filter; input-referred noise; regulated cascode input stage; transimpedance amplifiers; Bandwidth; CMOS technology; Capacitance measurement; Delay; Design methodology; Low pass filters; Matched filters; Photodiodes; Radio frequency; Radiofrequency amplifiers; Bandwidth enhancement; broad-band; matching network; regulated cascode (RGC); transimpedance amplifier (TIA);
Journal_Title :
Circuits and Systems I: Regular Papers, IEEE Transactions on
DOI :
10.1109/TCSI.2006.887610
