A 93.36 dB, 161 MHz CMOS operational transconductance amplifier (OTA) for a 16 bit pipeline analog-to-digital converter (ADC) / Nordiana Mukahar and Siti Hawa Ruslan

A gain modified CMOS Operational Transconductance Amplifier (OTA) for
a 16 bit pipeline Analog-to-Digital Converter (ADC) is presented. The circuit
is designed to be used for a high resolution and low sampling rate ADC. Gain
boosting technique is implemented in the design to achieve high DC gain and
settling time as required. Post layout simulations for a 5 pF load capacitance
shows that OTA achieves a gain bandwidth of 161 MHz at a phase margin
93.14o with 93.27 dB DC gain. The settling time for an OTA is 163 ns for 0.1
% accuracy to achieve final value and consume power about 4.88 mW from
5 V power supply.