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| 型號(hào)： | LM7121IN |
| 英文描述： | IC-200MHZ FEEDBACK AMP |
| 中文描述： | 集成電路200MHz的反饋放大器 |
| 文件頁(yè)數(shù)： | 15/18頁(yè) |
| 文件大?。?/td> | 394K |
| 代理商： | LM7121IN |
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Application Information
(Continued)
Differential Gain and Differential Phase errors measured at
the load are less than 1% and 1
§
respectively.
R
G
and C
C
can be adjusted for various cable lengths to
compensate for the line losses and for proper response at
the output. Values shown correspond to a twisted pair cable
length of 25 meters with about 3 turns/inch (seeFigure 5 for
step response).
The supply voltage can vary from 8.5V up to 30V with the
output rise and fall times under 12 ns. With the component
values shown, the overall gain from the input to the output is
about 1.
Even though the transmission line is not terminated in its
nominal characteristic impedance of about 600
X
, the result-
ing reflection at the load is only about 5% of the total signal
and in most cases can be neglected. Using 75
X
termination
instead, has the advantage of operating at a low impedance
and results in a higher realizable bandwidth and signal
fidelity.
TL/H/12348–95
FIGURE 5. Step Response to a 1 V
PP
Input Signal
Measured across the 75
X
Load
TL/H/12348–98
(a) A
V
e b
1
C
C
e
2 pF for R
L
e
100
X
C
C
e
Open for R
L
e
Open
TL/H/12348–99
(b) A
V
e a
2
TL/H/12348–A0
(c) A
V
e a
2, Capacitive Load
TL/H/12348–A1
R
F
e
0
X
, C
C
e
Open for V
S
k
6V
R
F
e
510
X
, C
C
e
3 pF for V
S
t
6V
(d) A
V
e a
1
TL/H/12348–A2
(e) A
V
e a
1, V
S
e a
5V, Single Supply Operation
FIGURE 6. Application Test Circuits
http://www.national.com
15
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