Design and Implementation of 8-bit Flash ADC and R-2R DAC in Cadence 45nm CMOS Process for Biomedical Application

When working with mixed-signal circuits, a micro-electronic system needs both digital-to-analog (D/A) and analog-to-digital (A/D) converters. In this work, present a medium-speed, low-power flash ADC with an R2R DAC. The 45nm CMOS process was used to design the 8-bit ADC and DAC, which have a 0.7 V supply. A dynamic comparator, an 8-bit flash A/D logic unit that simulates an array's binary search logic, a two-stage operational amplifier, and an 8-bit D/A converter are the important components. The Flash ADC circuit uses 14.33 μW at a sampling frequency of up to 5 MHz, and R2R DAC uses 1.125 mW, according to the simulation findings.