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This paper presents an ADC which can be used for biomedical application like pacemaker. For the low-power operation, monotonic switching scheme and operating voltage reduction have been implemented in the design. The 10bit 1.8V rail-to-rail (SAR) ADC is realized using UMC 0.18µm CMOS process. Simulations are performed by spectre simulation. From static performance, offset error and full scale error are noticed. This performance issue can be corrected by reducing discharge in capacitor by implementing sampling switch as bootstrapped switch and proper selection of common-mode voltage where 20fF is used as unit capacitance.