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BW extension in shunt feedback transimpedance amplifiers using negative miller capacitance

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4 Author(s)
Goswami, S. ; Dept. of Electr. Eng., Arizona State Univ., Tempe, AZ ; Copani, T. ; Vermeire, B. ; Barnaby, H.

The large input capacitance seen at the input of transimpedance amplifiers (TIA) used in optical receivers is usually the primary BW bottleneck. A new approach for increasing the BW of shunt feedback TIA's utilizing negative miller capacitance is presented which incurs no significant power, area or noise penalty. With this technique, 10 Gb/s performance is made possible with the usage of just a single common emitter stage resulting in a low power and low area design. The differential TIA was implemented in a 0.18 mum SiGe BiCMOS technology and consumes 10.9 mA from a 1.8 V supply. It provides 495 Omega gain, 7.7 GHz BW and has a noise density of 5.8 pA / radic(Hz) @ 1 GHz. The technique is not technology dependent and may be applied to CMOS designs as well.

Published in:

Circuits and Systems, 2008. ISCAS 2008. IEEE International Symposium on

Date of Conference:

18-21 May 2008

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