2) Voltage Follower Peak Detector
Circuit Design
1) Use BIFET op-amps for minimum capacitor leakage current.
2) let R1 = R2 = 1M
3) C1 discharge current, Id IR(D2) 1A (reverse leakage current)
4) V = 1% of VP
5) Compute C1 from Eq. 1,
6) For op-amp A1, compute Io(max) from Eq.2,
7) For op-amp, compute the slew rate from Eq.3,