This is a simple form circuit for implementation the function of the LM12 IC. This circuit is shown the LM12 is prone to low-amplitude oscillation bursts coming out of saturation if the high-frequency loop gain is near unity. This is the figure of the circuit.
The R2C2 combination across the input works with R1 to reduce feedback at high frequencies without greatly affecting response below 100 kHz. A lead capacitor, C1, improves phase margin at the unity-gain crossover frequency. Proper operation requires that the output impedance of the circuitry driving the follower be well under 1 kX at frequencies up to a few hundred kilohertz.
The R2C2 combination across the input works with R1 to reduce feedback at high frequencies without greatly affecting response below 100 kHz. A lead capacitor, C1, improves phase margin at the unity-gain crossover frequency. Proper operation requires that the output impedance of the circuitry driving the follower be well under 1 kX at frequencies up to a few hundred kilohertz.
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