(a) The reactive elements in the feedback circuit cause the gain to fall (feedback increasing) with increasing frequency.
(b) Approximate response.
(a)
Ν
03
03
•log/
(b)
A.
-log/
Figure 4.18
108
Analog Electronics
ζ:
(Ν
O
>
Threshold of feeling Loudness level (phons)
120
100
80
60
40
20
0
Threshold of hearing
I 1 1
I I
111 J I I I I I 11
20 100 500 1000 5000 10000
Frequency in hertz
(a)
Input audio signal
40%
ta
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