Switched-Capacitor Circuits ( h t 10 4 10 5 10 6 t t f h t 11 D t t ...
Switched-Capacitor Circuits ( h t 10 4 10 5 10 6 t t f h t 11 D t t ...
Switched-Capacitor Circuits ( h t 10 4 10 5 10 6 t t f h t 11 D t t ...
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Charge Injection (chapter <strong>10</strong>.5)<br />
C 3<br />
1<br />
2<br />
Q 6<br />
Q 5<br />
C 1<br />
C A<br />
1 1a<br />
C 2<br />
1<br />
V i () z<br />
Q 2<br />
Q 1<br />
Q 4<br />
V o () z<br />
2<br />
2a<br />
Q 3<br />
• To reduce the effects of charge injection in SC circuits, it realize<br />
all switches connected to ground or virtual ground as n-<br />
channel switches only, and turn off the switches connected to<br />
ground or virtual ground first. Such an approach will minimize<br />
distortion and gain error as well as keeping DC offset low.<br />
• In this case 1a and 2a are turned off first to prevent other<br />
switches affecting the output voltage of the circuit.
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