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Clampers and clippers

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CLAMPING CLAMPING CIRCUITES,CLIPPER CIRCUITES,CLIPPER & & PEAK DETECTORS PEAK DETECTORS Dr. C. Saritha, Lecturer in Electronics S.S.B.N P.G COLLEGE, ANANTAPUR
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Page 1: Clampers and clippers

CLAMPING CLAMPING CIRCUITES,CLIPPERCIRCUITES,CLIPPER

&&PEAK DETECTORSPEAK DETECTORS

CLAMPING CLAMPING CIRCUITES,CLIPPERCIRCUITES,CLIPPER

&&PEAK DETECTORSPEAK DETECTORS

Dr. C. Saritha, Lecturer in Electronics

S.S.B.N P.G COLLEGE, ANANTAPUR

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OVERVIEW

INTRODUCTIONDEFINATIONS CIRCUIT DIAGRAMS WAVEFORMS CONCLUSION

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• Some of the non linear function circuits are :

CLAMPERS CLIPPERS PEAK DETECTORS

INTRODUCTION

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CLAMPING CIRCUITS The clamping circuits in general, designed

“clamp” the top or bottom of a waveform.

Fixed d.c. level, which may be zero, while preserving its shape and amplitude

The distinguishing feature of a clamper is that is it adjusts the d.c. level without needing to know the exact waveform.

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• Zero volts-waveforms

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CLAMPING CIRCUITS:

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Waveforms :

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Operation of the circuit : input voltage vi = vm sin ω t and vref

Interval 0 ≤ ω t ≤ π :

Vi is positive, Vd is negative V0 is negative the diode is reverse biased. No current flows through the capacitor i.e. it is not charged.

Interval π ≤ ω t ≤ 3 π/2 : Vi is negative V0 is positive. The diode conducts and the NV terminal of the op amp behaves as virtual ground. The capacitor c1 gets charged with point A at a potential higher than that of point be the capacitor gets charged to the peak value Vm of the input voltage.

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Interval ω t > 3π/2 :Vd = - (Vm + Vi) = -Vm (1+sin ωt )

And diode D is OFF. As a result the output voltage. V0 = - Vd = Vm (1+sin ωt )

Reference voltage the capacitor gets charged to (Vm +vref ) the output voltage.

V0 = Vm sin ωt + (Vm +vref )

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Examples : Vm = 10 v and Vref = 5v

V0 = 10 sin ωt +10+5 = 10 sin ωt + 15

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Waveforms for +vref and –vref :

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CLIPPER Clipper are circuits which can

clipp off a portion of the input waveform without distorting the rest of the waveform.

Clipping circuits are also refer limiter amplitude selectors or slicers.

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POSITIVE CLIPPER :

Precession diode which can be used to slice off a portion of the positive half of the input signal. The level at which clipping is done is determined by the reference voltage.

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Positive clipper :

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Positive clipper waveforms :

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NEGATIVE CLIPPER :

Reversed and the reference voltage the resulting circuit is a negative clipper circuit. it clips OFF the negative region of the input signal waveform below the reference voltage.

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Negative clipper circuit :

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Negative clipper waveforms :

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PEAK DETECTORS

Detector : The maximum value is called detector

Peak detectors : Peak detectors ate electronic circuits that track the input signal faithfully until it detects a peak and holds that value until a new, Larger peak is detected.

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Basic peak detector :

The diode allows un directional current to charge the capacitor. The capacitor stories the charge and acts as a voltage memory. It holds the peak value of the input voltage. To detect a peak, S1 has to be closed and S2 open. To hold the peak value both the switches should be open. To reset the circuit, S1 has to be opened and S2 closed.

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Basic peak detector :

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Peak detector waveform :

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Thank you


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