几种相关双采样拓扑电路分析

相关双采样法在ＣＣＤ视频信号处理领域中被广泛使用，它不仅能有效地消除ＫＴＣ噪声，而且能够抑制低频噪声和宽带白噪声。文章对双δ法、四δ采样法（ＦＤＡ）、微分平均法、四δ法（ＦＧＡ）、双微分平均法五种相关双采样拓扑结构的电路进行研究，其中重点对双δ法的传输函数和抑制噪声能力进行了计算和分析。

Study on Topological Schemes of Correlated Double Sampling

Correlated double sampling(CDS) techniques are widely used in CCD s ignal processing schemes, which employ time delay and subtraction to eliminate K TC noise and attenuate 1/f,1/f2 noise.They also include a low-pass function to r educe the effect of broadband noise. The CDS include double delta sampling,qua d delta sampling(FDA),differential average,quad delta(FGA)and double different ial average. In this paper,principle for each of these schemes is st udied, their transfer functions are derived, properties are discusse d in detail and noise power cures are illustrated.Finally ,performance compariso n is given with emphasis on their applicability to relatively high-speed CCD rea dout applications.