As we all know

with the development of th eCharge Coupled Device

the application field of CCD is enlarging

the noise ofCCD become an obstacle which hinders the development of CCD. The noise isa major parameter of CCD which determine the signal to noise. We present a new method of CDS because of the shortcoming in thecurrent methods

that is

the metheod which based on commuted band-passfilter. We analyze the new method from white noise and 1/f noise and designhe mathematic model. The model is close to practice because of the dynamiccharacter.We discover a new method to reduce the noise of CCD which is betterthan the current methods in stability

cost and interfacing with the A/Dconverters. All of these is a useful experiment for reduction noise of CCD

itwill improve the signal to noise of CCD. Key words:CCD

signal no ise radio

the metheod which based on commuted band-passfilter

noise

Double Sampling