Interestingly, this dc gain is identical to that given by Equation (3.88). In addition, it
can be found that the signal at node A is expressed as
Vz
MMzHzMMz
z
A
(
)
=−
+−
(
)
+
(
)
⋅+−
(
)
[]
−
−−
−
12
1
46
1
11
1
11
⋅
(
)
Vz
in
(4.8)
Similar to what we saw in Chapter 3, it can be proved that the dc signal level at node
A is independent of H(z), hence there is some freedom in deciding the values of M
1
,
M
4
, M
5
, and M
6
. By equating the corresponding system coefficients in Equations
(3.24) and (4.6), we can write the following:
dMMMMdMM
14556256
21=+−=−,and(4.9)
Utilizing the freedom of choosing the values of M
4
, M
5
, and M
6
, we obtain ...
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