Optimized Low Power Circuit for Sar –Adc In Medical Applications

Abstract

in today’s advance electronic and communication systems the role of high accuracy analog to digital converters are of greatimportance. Nowadays, a larger percentage of mixed-signal applications requires for health care systems. Also the speed of the chosen ADCdesign matters a lot as we are connected with the real world signals.SAR based ADC will provides us a better solution for various analog to digital systems. It is an essential device whenever data from the analogworld, through sensors or transducers, should be digitally processed or when transmitting data between chips through either long-range wirelesslinks or high-speed transmission between chips on the same printed circuit board. The paper projects up down and ring counter as a logic for successive approximation register (SAR logic for a ADC that is one of the bestsuited for low power. Here the resolution is of 4-bit and a power consumption of few milliwatts. SAR ADC is implemented in 45 nm nano-meter scaling technology CMOStechnology with a powersupply of 0.5vby maintaining 4:1 w/l ratio.