LMC6482QML_16 Datasheet, PDF (16/29 Pages) Texas Instruments – LMC6482QML CMOS Dual Rail-To-Rail Input and Output Operational Amplifier

LMC6482QML
SNOSAR9A – DECEMBER 2010 – REVISED MARCH 2013
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Figure 58. LMC6482 Noninverting Amplifier,
Compensated to Handle a 330pF Capacitive Load
R1 and C1 serve to counteract the loss of phase margin by feeding forward 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 are experimentally determined for the desired pulse response. The resulting pulse
response can be seen in Figure 59.
Figure 59. Pulse Response of
LMC6482 Circuit in Figure 58
COMPENSATING FOR INPUT CAPACITANCE
It is quite common to use large values of feedback resistance with amplifiers that have ultra-low input current,
like the LMC6482. Large feedback resistors can react with small values of input capacitance due to transducers,
photodiodes, and circuits board parasitics to reduce phase margins.
Figure 60. Canceling the Effect of Input Capacitance
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