High unity-gain bandwidth operational transconductance amplifier (OTA) for high
resolution 8-bit pipelined analog-to-digital converter (ADC) was designed to satisfy
the differential non-linearity (DNL) of ±1 LSB and conversion time less than 20 /js.
The resolution of pipelined ADC is limited by open-loop DC gain provided by the
OTA that acts as the core element in developing the ADC. The existing design of
folded cascode OTA does not has a high open-loop DC gain to maintain the resolution
of 8-bit. The choice of folded cascode is the best suited architecture for high resolution
switched capacitor application as compared to the other topology.