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| 型號： | AB-103 |
| 英文描述： | AB-103 - NOISE ANALYSIS FOR HIGH SPEED OP AMPS |
| 中文描述： | 抗體- 103 -噪聲分析高速運(yùn)算放大器 |
| 文件頁數(shù)： | 2/6頁 |
| 文件大?。?/td> | 69K |
| 代理商： | AB-103 |
2
MUX
R
F
10k
C
100nF
100nF
10V
R
1
10k
10k
0V
V
C
2
5
1
10
Time (μs)
1
1
V
IN
V
IN
V
C
V
OUT
V
OUT
I
IN
FIGURE 3. An Input Current Flows Through the Protection Diodes and R
F
.
R
F
10k
10V
0V
V
OUT
V
IN
I(t) = (V
IN
(t) – V
DIODE
) – V
OUT
(t)
R
F
5
0
0
5
10
Time (μs)
V
IN
V
OUT
I
IN
Since 10V of voltage difference between the inputs would
damage bipolar op amps, protection diodes are generally
located at the inputs. These protection diodes, with a clamp
voltage of approximately 0.7V, prevent a rise in voltage in
case of overload. As a consequence, however, a current
flows from the noninverting input via this protection cir-
cuitry to the inverting input and from there to the output of
the op amp (see Figure 3).
The current is limited by the source, as well as by R
F
or the
short-circuit current of the op amp. When R
F
= 10k
, the
resulting current is (10V– 0.7V)/10k
< 1mA. If R
F
and the
MUX channel resistor were not present, the 60mA output
current of an OPA27 would already damage the input, as
illustrated in Figure 4. In practice, the current is also limited
10V
0V
V
OUT
V
IN
R
ON
≈
1k
OPA27
1
2
Time (μs)
0
2.5
5
V
IN
I
IN
V
OUT
FIGURE 5. Changing the Charge in the 100nF Capacitor.
FIGURE 4. No Current Limitation Can Lead to Destruction of the OPA27.
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