A 0.8V 40 Gb/s Novel CMOS Regulated Cascode Trans-impedance Amplifier for Optical Sensing Applications
This paper describes a 0.8V 700?W CMOS low-voltage regulated cascode trans-impedance amplifier (TIA). It reduces the need for extra bias voltages compared to other recent low-voltage regulated cascode topologies. A trans-impedance gain of around 60dB? along with a 40GHz bandwidth was achieved using the 0.13?m IBM CMOS process technology. The input referred noise current spectral density was below \( {{{18{\mathrm{pA}}}} \left/ {{\sqrt {\mathrm{Hz}} }} \right.} \) within the -3dB noise bandwidth. Eye diagram simulations using a ?53dBm input photo-diode current signal and a 231-1 pseudo random bit sequence data pattern, indicates an eye opening of 90% at 10Gbit/s and 50% at 40Gbit/s. This proposed RGC TIA is thus a robust building block for numerous optical sensing applications with low bit error ratio (BER) figure.
regulated cascode trans-impedance amplifier optical sensing