參數資料
型號: AD8005
廠商: Analog Devices, Inc.
英文描述: Current Feedback Amplifier(電流反饋放大器)
中文描述: 電流反饋放大器(電流反饋放大器)
文件頁數: 11/12頁
文件大?。?/td> 249K
代理商: AD8005
AD8005
–11–
REV. 0
Increasing Feedback Resistors
Unlike conventional voltage feedback op amps, the choice of
feedback resistor has a direct impact on the closed-loop band-
width and stability of a current feedback op amp circuit.
Reducing the resistance below the recommended value makes
the amplifier more unstable. Increasing the size of the feedback
resistor reduces the closed-loop bandwidth.
V
OUT
2V (rms)
+5V
562
4.99k
–5V
AD8005
V
IN
0.2V (rms)
QUIESCENT CURRENT
475μA (MAX)
360μA (rms)
Figure 33. Saving Power by Increasing Feedback Resistor
Network
In power-critical applications where some bandwidth can be
sacrificed, increasing the size of the feedback resistor will yield
significant power savings. A good example of this is the gain of
+10 case. Operating from a bipolar supply (
±
5 V), the quiescent
current is 475
μ
A (excluding the feedback network). The
recommended feedback and gain resistors are 499
and 56.2
respectively. In order to drive an rms output voltage of 2 V, the
output must deliver a current of 3.6 mA to the feedback
network. Increasing the size of the resistor network by a factor
of 10 as shown in Figure 33 will reduce this current to 360
μ
A.
The closed loop bandwidth will however decrease to 20 MHz.
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