Based on properties of noise on the output signal of CCD

signal-processing schemes used to reduce the effect of KTC noise and to attenuate 1/f and broadband write noise are analysed. These schemes employ time delay and subtraction to eliminate KTC noise and attenuate 1/f noise. They also include a low-pass function to reduce the effect of broadband write noise. Signal processing schemes described in this paper are double-correlated sampling

dual-slope integration and switched exponential filtering. Each of these schemes' principle is discussed and presented

its transfer functions is deducted in this paper. Performance comparisons are given with emphasis on their applicability in high-speed CCD readout applications.