Accurate peak-valley value detector circuit

Published:2012/8/28 2:13:00 Author:Ecco | Keyword: Accurate , peak-valley value , detector | From:SeekIC

This circuit only uses two operational amplifiers to complete the peak-valley value detection of non-sine waveform. During the peak period, D1 breakover makes the C1 charge and reach peak, because of limiting effect of R1, C1 discharge minimal, charge again until the next peak to maintain the peak voltage output. Valley detection is contrary to the above values. C2 rapidly discharges to Valley value voltage by D2 during valley and trace discharges while other time only by D4, R2; C2 always remains valley voltage. The 1 Ω resistor connected to C1, C2 in series is used to prevent overshoot.



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