Digital Offset Calibration of an OPAMP Towards Improving Static Parameters of 90 nm CMOS DAC
In this paper, an on-chip self-calibrated 8-bit R-2R Shirt digital-to-analog converter (DAC) based on digitally compensated input offset of the operational amplifier (OPAMP) is presented.To improve the overall DAC performance, a digital offset cancellation method was used to compensate deviations in the input offset voltage of the OPAMP caused by p