Demystifying Switched Capacitor Circuits

Demystifying Switched-Capacitor Circuits

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An interesting analog calibration technique was reported by Moon et al. [33].

The technique uses a thermometer-coded SC DAC similar to that in Figure 5.3(a) as

the demonstration platform. The basic idea is to adaptively calibrate the charge

delivered via each input branch by using a variable reference voltage for each branch

(similar to the current copying and the reference refreshing techniques reported in

[18] and [25], respectively), until all branch charges accord with a single reference

charge value, which is rectifi ed by an accurate capacitor (i.e., the nominal C). In

effect, the deviation o