In all cases (single op amp and dual op amp circuits) a diode in the feedback path of the input amplifier curtails its negative-going output voltage swing. Ideally the output of a peak detector ...

Fig 1 can detect the peak of either positive or negative inputs, yet it operates from a single supply. The circuit uses two unity-gain amplifiers to monitor the input signal, one an inverting ...

The standard hardware requirements for sample-and-hold and peak detector circuits apply to D1, C1, and A2. C1 must be a high-quality capacitor, D1 must be a low-leakage diode, and the bias current ...

The standard way to measure the peak ... speed dual op amp to compensate for the diode turn-on voltage (Fig. 1). The diode provides the rectification, just as it would in a simple peak detector.