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AN-763
R2
100k Ω
R2
Application Note
V OUT
V IN
R1
1k Ω
1/2
AD8657
V–
V+
V EE
R3
1k Ω
C2
V CC
V CC
V+
V–
V EE
R4
100 Ω
1/2
AD8657
C3
V IN
C L R L
Figure 7. Series Resistor Compensation
R L = 10k Ω
C L = 2nF
Figure 6. Low Power Composite Amplifier
A composite amplifier can be used to optimize the dc and ac
characteristics. Figure 6 shows an example using the AD8657 ,
which offers many circuit advantages. The bandwidth is
increased substantially and the input offset voltage and noise
of the AD8657 becomes insignificant because they are divided
by the high gain of the amplifier. The circuit offers a high
bandwidth, a high output current, and a very low power
consumption of less than 100 μA.
EXTERNAL COMPENSATION TECHNIQUES
Series Resistor Compensation
The use of external compensation networks may be required
to optimize certain applications. Figure 7 shows a typical
representation of a series resistor compensation to stabilize an
op amp driving capacitive loads. The stabilizing effect of the
series resistor can be thought of as a means to isolate the op
amp output and the feedback network from the capacitive load.
The required amount of series resistance depends on the part
used, but values of 5 ? to 50 ? are usually sufficient to prevent
local resonance. The disadvantage of this technique is a
GND
GND
TIME (10μs/DIV)
Figure 8. Capacitor Load Drive Without Resistor
R L = 10k Ω
R S = 200 Ω
C L = 2nF
C S = 0.47μF
reduction in gain accuracy and extra distortion when driving
nonlinear loads.
TIME (10μs/DIV)
Figure 9. Capacitor Load Drive with Resistor
Rev. C | Page 4 of 8
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