A bootstrapped sampling switch applied for 10 bits 10MSPS SAR ADC is designed based on the Global Foundries 0.18m CMOS process.The disadvantages of complemented CMOS sampling switch and conventional bootstrapped sampling switch are discussed.A new bootstrapped sampling circuit topology is presented to efficiently achieve high reliability.Simulation result shows that the SNDR of the proposed circuit can reach 72 dB when input signal frequency closes to Nyquist frequency

which satisfies the requirement of 10 bits 10MSPS SAR ADC.