Skip to Main Content
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.
Date of Conference: 18-21 May 2008