基于单片机的数字时钟设计--外文翻译(17)

Abstract Virtually complete charge transfer can be achieved with charge coupleddevices(CCDs)intheburiedchannelconfigurationbecausetheburiedchannelCCDintroduces no transfer noise. However, conventional charge detectors incorporatedinto CCDs have a comparably large noise, which consists of thermal noise and 1/fnoisefromMOS transistorin theoutputchargedetectors.

10Low-NoiseElectronicImagingwithDouble-GateFETs

235Fig.10.20Detector

structure

Fig.10.21Potentialdiagramsofsensingchannel.(a)Saturationconditioninopenloop.(b)Compressedconditionbynegativefeedback.(c)Saturationconditioninnegativefeedback

coef cientandthefeedbackampli ergain,respectively.Inthisdetector,kisequaltoCg=.CgCCc/,whereCgandCcarethegatecapacitanceofthedetectiontransistorandthediffusioncapacitanceofthen-typesensingchannelundertheFPP,respectively.ItisderivedfromthepartitionratiooftheCgandCcseriescapacitances.

NoiselesssignalchargeisconvertedintothevoltagesignalS,whilethedetectornoiseisNintheopen-loopchargedetector.Byapplyingtheinvertedoutputsignalontothefeedbackgate,notonlythevoltagesignalbutalsothedetectionnoiseiscompressed,andtheyresultinS0andN0.Signal-to-noiseratioS0=N0isequalto

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