Switched-Capacitor Circuits - University of Toronto
Switched-Capacitor Circuits - University of Toronto
Switched-Capacitor Circuits - University of Toronto
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Vi() z<br />
Vin() s<br />
<strong>University</strong> <strong>of</strong> <strong>Toronto</strong><br />
Low-Q Biquad Filter<br />
Ha() s<br />
Vout s ()<br />
----------------<br />
Vin() s<br />
o ko 1<br />
C A<br />
<strong>University</strong> <strong>of</strong> <strong>Toronto</strong><br />
=<br />
1<br />
1 k1 k 2<br />
=<br />
k2s 2<br />
+ k1s + ko s 2<br />
– ---------------------------------------<br />
<br />
o<br />
------ 2<br />
+ s + o<br />
Q <br />
1 o Vc1() s<br />
– 1 o Q o = 1<br />
C B<br />
Low-Q Biquad Filter<br />
C 1<br />
2<br />
1<br />
1<br />
2<br />
1 K1C1 1 K 2<br />
5C2 2<br />
2<br />
2<br />
1<br />
K 2 C 2<br />
K 3 C 2<br />
1<br />
2<br />
2<br />
K 4 C 1<br />
V1() z<br />
1<br />
2<br />
1<br />
K 6 C 2<br />
C 2<br />
Vout() s<br />
1<br />
2<br />
(38)<br />
35 <strong>of</strong> 60<br />
© D. Johns, K. Martin, 1997<br />
Vo() z<br />
36 <strong>of</strong> 60<br />
© D. Johns, K. Martin, 1997<br />
1
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