October 2013
Beginner to intermediate
152 pages
5h 10m
English
Content preview from Operational Amplifier Circuits
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Frequency
Response
27
Gain <dB>
120
r
iOOh
80l
601
40
201
N
X
V
X
\
X
X
•
I
•
,.. ) 1 t { 1 "% f , j
O.l l.O iO lOO Ik iOk iOOk llM^ 10M
Frequency
<
Hz
>
\
Figure
2-2. Bode plot for the open loop 741 amplifier (f
0
=
5
Hz).
Figure 2-2 clearly illustrates the important concept of a constant "gain-
bandwidth product" (GB). For all frequencies above f
0
the product of gain and
frequency is constant; for example, voltage gains of 10
5
(100 dB) at 10 Hz, 10
3
(60 dB) at
1
kHz, and 1 (0 dB) at
1
MHz all lead to the same product:
10
5
x 10 Hz = 10
3
x 1 kHz = 1 x
1
MHz =
1
MHz = GB.
2.2 Closed
Loop
Response,
Rise
Time
The ideas developed in the previou
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