A novel technique to enhance the open loop gain of CMOS folded cascode OTA

A modified CMOS folded cascode operational transconductance amplifier (OTA) based on standard digital 0.18 /spl mu/m CMOS process, capable to work at 1 V relax the design of high gain 1 V OTA. A unique output stage is employed to achieve open loop gain up to 80 dB, unity gain band width GBW=50 MHz, with phase margin of 58/spl deg/, while consume only 10 /spl mu/W (biasing circuit excluded) under 1 V power supply.