Closed-Loop Peak Detector Circuit


Posted on Nov 23, 2012

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
Click here to download the full size of the above Circuit.

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




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Data separator
Cold-Cathode Fluorescent-Lamp Supply
Auto Generator Regulator Circuit
0-24VDC Digital PIC Power Supply circuit diagram
Build a Variable-Frequency Audio Band pass FilterCircuit
home-made light-operated camera trigger
ML7005 DTMF Transceiver ML7005DTMF Transceiver
smatriger
MAX3420 Maxim USB Peripheral Controller
Tube-based Buffer amplifier



Top