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Demystifying Switched Capacitor Circuits
book

Demystifying Switched Capacitor Circuits

by Mingliang (Michael) Liu
June 2006
Intermediate to advanced content levelIntermediate to advanced
336 pages
10h 24m
English
Newnes
Content preview from Demystifying Switched Capacitor Circuits
Switched-Capacitor Filters
91
Hz
C
CC
z
C
CC
low pass
Hz
C
lp
ap
(
)
=
+
+
(
)
(
)
=
1
04
0
04
, -
22
04
12
2
0
04
CC
z
CC
C
z
C
CC
all pass
H
hp
+
+
+
(
)
, -
zz
C
CC
z
z
C
CC
high pass
(
)
=
+
(
)
+
(
)
3
04
0
04
1
, -

(4.1)
Note that these three functions have identical denominators, which implies that they can
be transformed from the same generic fi rst-order transfer function. Specifi cally, consider
a generic fi rst-order sampled-data transfer function given by the following expression:
Hz
cz c
zd
(
)
=
±
10
0
(4.2)
First, to realize a fi rst-order low-pass fi lter using the circuit in Figure 4.2, the
capacitors should have the following relationships:
C
c
d
CC
d
d
C
1
0
0
04
0
0
0
1
==
, and (4.3)
Second ...
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Publisher Resources

ISBN: 9780750679077