Position: Index > Unclassified >

Closed-Loop Peak Detector Circuit

2017-09-03 00:46  
Declaration:We aim to transmit more information by carrying articles . We will delete it soon, if we are involved in the problems of article content ,copyright or other problems.

This closed-loop peak detector circuit uses a Schottky diode inside feedback loop to obtain good accuracy. The 20- resistance RQ isolates the 0.01- load and prevents oscillation. The dc value is read with a DVM. At a low frequency, the error is small and dominated by the decay of the detector capacitor between cycles. As the frequency rises, the error increases because capacitor charging time decreases. During this time, the overdrive becomes a very small portion of a sine-wave cycle.
Closed-Loop Peak Detector Circuit

Finally, at approximately 4 MHz, the error rises rapidly because of the slew- rate limitation of the op amp.

Reprinted Url Of This Article: