Abstract: This paper describes the design of a high-speed CMOS Sample and Hold circuit in front of an analog to digital converter (ADC). Sample and hold (S/H) circuit employs linear source follower buffer at input and output. Synopsys cosmosSE software tool has been used for schematic design, H-spice for Simulation and Cscope for waveform performance. Complete S/H circuit has designed with tsmc035 (Taiwan semiconductor manufacturing corporation) technology, with 2.5V power supply. Power consumption of 5 mW for 8 MHz at 53 MS/s.