OPEN_LOOP_PEAK_DETECTOR

Published:2009/6/15 22:33:00 Author:May | From:SeekIC

In this open-loop design, the detector diode is D1, and a level shifting or compensating diode is D2. Load reststor RL is connected to -5V, and an identical bias resistor RL is connected to -5 V, and identical bias resistor RL is used to bias the compensating diode. Resistors with equal values ensure that the diode drops are equal. Low values of RL and RB (1kΩ to 10kΩ) provide fast response, but at the expense of poor low-frequency accuracy. High values of RL and RB provide good low-frequency accuracy, but cause the amplifier to slew rate limit, resulting in poor high-frequency accuracy. A good compromise can be made by adding a feedback capacitor CFB which enhances the negative slew rate on the (-) input.



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