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LMV716 데이터시트(PDF) 9 Page - Texas Instruments

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부품명 LMV716
상세설명  LMV716 5 MHz, Low Noise, RRO, Dual Operational Amplifier with CMOS Input
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LMV716
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SNOSAT9B – APRIL 2006 – REVISED MARCH 2013
APPLICATION INFORMATION
With the low supply current of only 1.6 mA, the LMV716 offers users the ability to maximize battery life. This
makes the LMV716 ideal for battery powered systems. The LMV716’s rail-to-rail output swing provides the
maximum possible dynamic range at the output. This is particularly important when operating on low supply
voltages.
CAPACITIVE LOAD TOLERANCE
The LMV716, when in a unity-gain configuration, can directly drive large capacitive loads in unity-gain without
oscillation. The unity-gain follower is the most sensitive configuration to capacitive loading; direct capacitive
loading reduces the phase margin of amplifiers. The combination of the amplifier’s output impedance and the
capacitive load induces phase lag. This results in either an underdamped pulse response or oscillation. To drive
a heavier capacitive load, the circuit in Figure 26 can be used.
Figure 26. Indirectly Driving a Capacitive Load using Resistive Isolation
In Figure 26, the isolation resistor RISO and the load capacitor CL form a pole to increase stability by adding more
phase margin to the overall system. The desired performance depends on the value of RISO. The bigger the RISO
resistor value, the more stable VOUT will be.
The circuit in Figure 27 is an improvement to the one in Figure 26 because it provides DC accuracy as well as
AC stability. If there were a load resistor in Figure 26, the output would be voltage divided by RISO and the load
resistor. Instead, in Figure 27, RF provides the DC accuracy by using feed-forward techniques to connect VIN to
RL. Due to the input bias current of the LMV716, the designer must be cautious when choosing the value of RF.
CF and RISO serve to counteract the loss of phase margin by feeding the high frequency component of the output
signal back to the amplifier’s inverting input, thereby preserving phase margin in the overall feedback loop.
Increased capacitive drive is possible by increasing the value of CF. This in turn will slow down the pulse
response.
Figure 27. Indirectly Driving a Capacitive Load with DC Accuracy
Copyright © 2006–2013, Texas Instruments Incorporated
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