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參數(shù)資料
| 型號(hào)： | AD811 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | High Performance Video Op Amp(高性能視頻運(yùn)放) |
| 中文描述： | 高性能視頻運(yùn)算放大器（高性能視頻運(yùn)放） |
| 文件頁數(shù)： | 10/16頁 |
| 文件大?。?/td> | 286K |
| 代理商： | AD811 |
AD811
REV. C
–10–
Driving Capacitive Loads
T he feedback and gain resistor values in T able I will result in
very flat closed-loop responses in applications where the load
capacitances are below 10 pF. Capacitances greater than this
will result in increased peaking and overshoot, although not nec-
essarily in a sustained oscillation.
T here are at least two very effective ways to compensate for this
effect. One way is to increase the magnitude of the feedback re-
sistor, which lowers the 3 dB frequency. T he other method is to
include a small resistor in series with the output of the amplifier
to isolate it from the load capacitance. T he results of these two
techniques are illustrated in Figure 32. Using a 1.5 k
feedback
resistor, the output ripple is less than 0.5 dB when driving 100 pF.
T he main disadvantage of this method is that it sacrifices a little
bit of gain flatness for increased capacitive load drive capability.
With the second method, using a series resistor, the loss of flat-
ness does not occur.
7
6
4
3
2
V
IN
R
G
–V
S
+V
S
R
FB
0.1μF
0.1μF
R
L
AD811
R
T
C
L
R (OPTIONAL)
V
OUT
Figure 31. Recommended Connection for Driving a Large
Capacitive Load
12
–6
3
–3
0
1M
9
6
10M
100M
FREQUENCY – Hz
G
G = +2
V =
±
15V
R = 10k
C = 100pF
R = 1.5k
R = 0
R = 649
R = 30
Figure 32. Performance Comparison of Two Methods for
Driving a Capacitive Load
100
0
10pF
1000pF
30
10
100pF
20
60
40
50
70
80
90
LOAD CAPACITANCE
V
S
G = +2
V =
±
15V
R VALUE SPECIFIED
IS FOR FLATTEST
FREQUENCY RESPONSE
Figure 33. Recommended Value of Series Resistor vs. the
Amount of Capacitive Load
Figure 33 shows recommended resistor values for different load
capacitances. Refer again to Figure 32 for an example of the re-
sults of this method. Note that it may be necessary to adjust the
gain setting resistor, R
G
, to correct for the attenuation which re-
sults due to the divider formed by the series resistor, R
S
, and the
load resistance.
Applications which require driving a large load capacitance at a
high slew rate are often limited by the output current available
from the driving amplifier. For example, an amplifier limited to
25 mA output current cannot drive a 500 pF load at a slew rate
greater than 50 V/
μ
s. However, because of the AD811’s 100 mA
output current, a slew rate of 200 V/
μ
s is achievable when driv-
ing this same 500 pF capacitor (see Figure 34).
10
90
100
0%
5V
2V
100ns
V
IN
V
OUT
Figure 34. Output Waveform of an AD811 Driving a
500 pF Load. Gain = +2, R
FB
= 649
, R
S
= 15
,
R
S
= 10 k
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