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Title:
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Broad-band design techniques for transimpedance amplifiers.
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Author:
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Lu, Zhenghao.; Yeo, Kiat Seng.; Ma, Jianguo.; Do, Manh Anh.; Lim, Wei Meng.; Chen, Xueying.
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Copyright year:
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2007 |
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Abstract:
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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. |
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Subject:
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DRNTU::Engineering::Electrical and electronic engineering::Electronic circuits. |
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Type:
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Journal Article |
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Series/ Journal Title:
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IEEE transactions on circuits and systems I |
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Rights:
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IEEE |
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Version:
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Published version |
