The column output circuit is realized by double sample and hold circuit which can effectively decrease fpn ( fixed pattern noise ) 列輸出電路采用雙采樣電路,該電路能有效地消除固定模式噪聲。
The differential , which can be placed in roic chip , is used to difference the two voltage signals in cds in order to reduce fixed pattern noise in roic 該差分器可置于讀出電路片內,對相關雙采樣電壓信號進行差分,以減小讀出電路的固定圖形噪聲。
The correlated double sampling ( cds ) circuits structure is used to reduce the fixed pattern noise ( fpn ) of the cmos sensors , and improve the signal - noise ratio ( snr ) . the 256 photodiodes arrayed 4 quadrants sensor consists 16x16 active photodiodes array . correlated double sampling processing circuits , output buffer amplifiers and digital control part 針對cmos制造工藝中mos器件固定模式噪聲( fixedpatternnoise , fpn )較大的不足,研究中采用了相關二次采樣( correlateddoublesampling , cds )電路降低固定模式噪聲,從而提高了傳感器的信噪比( signalnoiseratio , snr ) 。