A 94 GHz Bandwidth Transimpedance Amplifier in 55nm SiGe BiCMOS for High Speed Optical Receivers

A transimpedance amplifier with a bandwidth of 94 GHz is presented and on chip measurements are discussed. The measured gain of the amplifier at low frequencies is 55 $\mathrm{dB}\Omega$, peaking to 61 $\mathrm{dB}\Omega$ at 78 GHz. The circuit was designed in a cutting edge 55nm SiGe BiCMOS technology, occupies a pad limited area of 0.02 mm
²
, and consumes 14 m A of current from a 3.3V supply. The circuit achieves an average input referred current noise of 11 pA/$\sqrt{Hz}$, making it suitable for future high speed optical receivers.