- Time Variant Shapers
Double Sampling (CDS) is discussed as a case study. The CDS technique finds in
fact widespread use in integrated front-end electronics, in particular in the readout of
monolithic CMOS sensors.
Understanding the basics of noise calculations in the time domain is crucial for
several reasons. First, it is the most direct tool to quantify the ENC of time variant
networks, at least as far as white series and parallel noise sources are concerned.
Second, it is the technique employed in a number of key papers dealingwith the subject
of noise analysis andminimization in electronics for radiation sensors. Third, the time
domain view provides an alternative and in some cases more intuitive perspective on
the central issue of noise. In the last part of the chapter a few significant examples of
time variant filters implemented in CMOS technologies are discussed.