The research work is focused on the specific application of switched capacitor array（SCA） in high energy physics experiments. A new kind of an is proud

which can effectively overcome the influence of clock feedthrough on sample precision and offset voltage of read-out amplifier on read-out precision. An amplifier which can meet the requirement of rail-to-rail application is specially designed. On the basis of circuit simulation

full-custom layout of this mixed-signal circuit is designed

according to the deSign rule of 1. 2μm N-well double-metal double-poly CMOS technology. The test results of the sample dice show that the dice fulfills the function expected successfully

with maximum sampling rate 180MHz

co gain（sampling rate: 6MHz） 0. 99

and nonlinearity 0. 02 %.