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參數(shù)資料
| 型號： | OPA603AU |
| 英文描述： | High Speed, Current-Feedback, High Voltage OPERATIONAL AMPLIFIER |
| 中文描述： | 高速，電流反饋，高電壓運算放大器 |
| 文件頁數(shù)： | 10/12頁 |
| 文件大?。?/td> | 262K |
| 代理商： | OPA603AU |
OPA603
10
FIGURE 2. Dynamic Response, Inverting Unity-Gain.
SMALL-SIGNAL FREQUENCY RESPONSE
Frequency (Hz)
100k
1M
10M
100M
G
+6
+3
0
–3
–6
100pF
50pF
0pF
20pF
10pF
+
–
V
IN
V
IN
V
O
150
150
2.5k
2.5k
V = ±15V
2.5k
NOTE: Feedback resistor value
selected for reduced peaking.
C
L
=
V
O
C
L
LARGE SIGNAL PULSE RESPONSE
Input
Output
SMALL-SIGNAL FREQUENCY RESPONSE
Frequency (Hz)
100k
1M
10M
100M
G
+26
+23
+20
+17
+14
100pF
50pF
0pF
20pF
10pF
–
+
V
IN
V
IN
V
O
3570
402
150
150
NOTE: Feedback resistor value
selected for reduced peaking.
V = ±15V
FIGURE 3. Dynamic Response, Gain = +10.
C
L
=
V
O
402
C
L
LARGE SIGNAL PULSE RESPONSE
Output
Input
With control of the open-loop characteristics of the op amp,
dynamic behavior can be tailored to an application’s require-
ments. Lower feedback resistance gives wider bandwidth,
more frequency-response peaking and more pulse response
overshoot. The higher open-loop gain resulting from lower
feedback network resistors also yields lower distortion.
Higher feedback network resistance gives an over-damped
response with little or no peaking and overshoot. This may
be beneficial when driving capacitive loads. Feedback net-
work impedance can also be varied to optimize dynamic
performance. To achieve wider bandwidth, use a feedback
resistor value somewhat lower than indicated in Figure 4.
EXTENDING BANDWIDTH
For gains less than approximately 20, bandwidth can be
extended by adding a capacitor, C
, in parallel with a lower
value for R
. The optimum feedback resistor value in this
case is far lower than those shown in Figure 1. For
±
15V
operation, select R
F
with the following equation:
APPLICATIONS INFORMATION
For most circuit configurations, the OPA603 current-feed-
back op amp can be treated like a conventional op amp. As
with a conventional op amp, the feedback network con-
nected to the inverting input controls the closed-loop gain.
But with a current-feedback op amp, the impedance of the
feedback network also controls the open-loop gain and
frequency response.
Feedback resistor values can be selected to provide a nearly
constant closed-loop bandwidth over a very wide range of
gain. This is in contrast to a conventional op amp where
circuit bandwidth is inversely proportional to the closed-
loop gain, sharply limiting bandwidth at high gain.
Figures 4a and 4b show appropriate feedback resistor values
versus closed-loop gain for maximum bandwidth with mini-
mal peaking. The dual vertical axes of these curves also
show the resulting bandwidth. Note that the bandwidth
remains nearly constant as gain is increased.
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