Design of low-voltage high performance CMOS-Current feedback amplifier using indirect feedback compensated Op-Amp

Abstract

In this paper low-voltage high performance CMOS Current Feedback Amplifier is designed using indirect feedback compensated operational amplifier and the results are compared with the existing topology. The Operational-Amplifier used has the open loop gain of 101.8 dB with 25ns settling time, unity gain bandwidth 169.8 MHz, phase margin 70° with rail to rail output swing. The CMOS-Current Feedback Amplifier designed using this Operational-Amplifier has nearly gain independent bandwidth with settling time observed as 44 ns and slew rate increment up to 20V/µs. The circuit is designed at 0.18µm Digital CMOS process with supply voltage 1.8 volt.