Norton_peak_detector

Published:2009/7/24 23:48:00 Author:Jessie | From:SeekIC

In this circuit, the Norton is used to rapidly charge capacitor C to peak value of Vin. The voltage drop across CR1 is placed within the feedback loop to prevent voltage losses and temperature drifts in the output voltage. The feedback resistor (RF) is kept small (1 MΩ) so that the 30-nA base current of the Norton will cause only a +30-mV error in output voltage VO. Feedback resistor RF is con-stantly loading C, in addition the current drawn by the circuitry which samples VO. Bias resistor RB allows a minimum dc voltage to exist across C. Overall circuit gain is set by the value of RIN in relation to RF.



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