Title :
BW extension in shunt feedback transimpedance amplifiers using negative miller capacitance
Author :
Goswami, Sushmit ; Copani, Tino ; Vermeire, Bert ; Barnaby, Hugh
Author_Institution :
Dept. of Electr. Eng., Arizona State Univ., Tempe, AZ
Abstract :
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.
Keywords :
BiCMOS integrated circuits; Ge-Si alloys; feedback amplifiers; noise; optical receivers; semiconductor materials; BW bottleneck; BiCMOS technology; SiGe; bandwidth 1 GHz; bandwidth 7.7 GHz; bit rate 10 Gbit/s; current 10.9 mA; current 5.8 pA; negative Miller capacitance; noise density; optical receivers; resistance 495 ohm; shunt feedback transimpedance amplifiers; single common emitter stage; size 0.18 mum; voltage 1.8 V; CMOS technology; Capacitance; Germanium silicon alloys; Negative feedback; Optical amplifiers; Optical feedback; Optical noise; Optical receivers; Semiconductor optical amplifiers; Silicon germanium;
Conference_Titel :
Circuits and Systems, 2008. ISCAS 2008. IEEE International Symposium on
Conference_Location :
Seattle, WA
Print_ISBN :
978-1-4244-1683-7
Electronic_ISBN :
978-1-4244-1684-4
DOI :
10.1109/ISCAS.2008.4541354
