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OPA2388: peak-hold detector circuit affected by opamp input leakage current

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Kleinstein:
Low phase shift in close loop comes with high bandwidth. The speed is mainly needed for stability, not because the signal actually changes so fast.

The first OP may want good driving power for a capacitive load - this does not necessarily need high current. In parts one could get around this by using a transistor as emitter follower instead of the diode. Also the memory capacitor may need to get smaller at high speed.

For high speed rail to rail operation is often a problem. So if the signal is 0 - 4.5 V, one should consider a supply that can go a little higher. With RR OPs there often is a cross over range at something like 1.5 V below the supply. In this range the OP is slowed down to correct internal errors.

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