Enhanced Gain Constant Gm Low Power Rail to Rail Operational Transconductance Amplifier for Wideband Application

Sakshi Dhuware, Mohammed Arif

Abstract: A modification to the recycling current rail-to-rail operational transconductance amplifier is presented. The proposed amplifier has the benefit of delivering the better performance while consuming less amount of the power as compared to the conventional rail-to-rail amplifier. In this paper a constant current technique depending on the input stage is proposed. Using this method, the rail to rail amplifier processes low power and occupies a small chip area. The proposed amplifier was implemented in 65nm CMOS technology. Simulated results show that the proposed design achieves 76.6dB DC gain, 331.2 MHz GBP (gain bandwidth product) and the power consumption is goes up to 15.03uW at 1.6V supply voltage.

Keywords: OTA, rail to rail, common mode, transconductance amplifier, constant Gm control