摘要
提出了一种使用可交换带通滤波器的新的双相关采样（CDS）法。该方法使用具有可调频特性的动态带通滤波器，按照像素的读出顺序改变滤波器的参数，提取信号并使得相应的噪声带宽保持较低。根据给定的CCD输出噪声的特点和像素的读出频率，建立了数学模型来模拟系统的信噪比。最后，对噪声进行了模拟实验，给出了实验结果，并与传统CDS方法进行了对比。结果表明，白噪声的噪声值降低到一个平台上，并且持续大约10～15μs，当t=39μs时，输出噪声要比稳态时低。实验结果表明，这种方法较之现存的相关双采样技术具有稳定性高、制作成本低、便于与A／D转换器连接等优点。
A novel Correlation Double Sampling（CDS） method based on commuted band-pass filter was proposed. By using the dynamic band-pass filter with frequency modulation, the CCD signals were extracted by changing the filter parameters according to the extracting sequence of pixels, and the relevant noise band was kept a lower level also. For the CCD output noise and the extracted frequency of pixels, a mathematic model was established to simulate the S/N. Finally, contrasted experiment was carried out with the traditional CDS method, simulation results indicate that the value of white noise falls to a lower level and it keeps for 10-15μs. When t equals 39μs, the output noise is lower than that of the steady state,which shows that this method is better than the current methods in stability, cost and convenience of interfacing with the A/D converters.
出处
《光学精密工程》
EI
CAS
CSCD
北大核心
2008年第10期2020-2029,共10页
Optics and Precision Engineering
基金
总参测绘局资助项目(No.06241SR060)
