LMC6462 Datasheet, PDF (13/31 Pages) National Semiconductor (TI) – Micropower, Rail-to-Rail Input and Output CMOS Operational Amplifier

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LMC6462, LMC6464
SNOS725D – MAY 1999 – REVISED MARCH 2013
Figure 36. Resistive Isolation of a 300 pF Capacitive Load
Figure 37. Pulse Response of the LMC6462 Circuit Shown in Figure 36
Figure 37 displays the pulse response of the LMC6462/4 circuit in Figure 36.
Another circuit, shown in Figure 38, is also used to indirectly drive capacitive loads. This circuit is an
improvement to the circuit shown in Figure 36 because it provides DC accuracy as well as AC stability. R1 and
C1 serve to counteract the loss of phase margin by feeding the high frequency component of the output signal
back to the amplifiers inverting input, thereby preserving phase margin in the overall feedback loop. The values
of R1 and C1 should be experimentally determined by the system designer for the desired pulse response.
Increased capacitive drive is possible by increasing the value of the capacitor in the feedback loop.
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