Demystifying Switched Capacitor Circuits

Demystifying Switched-Capacitor Circuits

300

Quantizer

The 1-bit quantizer is built from a dynamic regenerative comparator and a static SR

latch, as shown in Figure 8.22. The comparator is appropriate for high-speed and

low-power applications [39], and it operates as follows. During the reset mode (i.e.,

ck

1e

is low), the outputs are connected to V

DD

through M

9

and M

10

. When ck

1e

goes high, the comparator enters the regenerative mode and transistors M

3

–M

8

form a positive feedback loop. As a result, the input difference voltage is amplifi ed to

a full-scale rail-to-rail output. Once the comparator makes a decision, the cross-

coupled transistors ...