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# Clampers and clippers

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useful for PG students …

useful for PG students

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• 1. CLAMPINGCIRCUITES,CLIPPER &amp; PEAK DETECTORS Dr. C. Saritha, Lecturer in Electronics S.S.B.N P.G COLLEGE, ANANTAPUR
• 2. OVERVIEW&#xF076;INTRODUCTION&#xF076;DEFINATIONS&#xF076; CIRCUIT DIAGRAMS&#xF076; WAVEFORMS&#xF076; CONCLUSION
• 3. INTRODUCTION&#x2022; Some of the non linear function circuits are : &#xF0D8;CLAMPERS &#xF0D8; CLIPPERS &#xF0D8; PEAK DETECTORS
• 4. CLAMPING CIRCUITS&#xF0C6; The clamping circuits in general, designed &#x201C;clamp&#x201D; the top or bottom of a waveform.&#xF0C6; Fixed d.c. level, which may be zero, while preserving its shape and amplitude&#xF0C6; The distinguishing feature of a clamper is that is it adjusts the d.c. level without needing to know the exact waveform.
• 5. &#x2022; Zero volts-waveforms
• 6. CLAMPING CIRCUITS:
• 7. Waveforms :
• 8. Operation of the circuit : input voltagevi = vm sin &#x3C9; t and vrefInterval 0 &#x2264; &#x3C9; t &#x2264; &#x3C0; : 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 &#x3C0; &#x2264; &#x3C9; t &#x2264; 3 &#x3C0;/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.
• 9. Interval &#x3C9; t &gt; 3&#x3C0;/2 : Vd = - (Vm + Vi) = -Vm (1+sin &#x3C9;t )And diode D is OFF. As a result the output voltage. V0 = - Vd = Vm (1+sin &#x3C9;t )Reference voltage the capacitor gets charged to (Vm +vref ) the output voltage. V0 = Vm sin &#x3C9;t + (Vm +vref )
• 10. Examples : Vm = 10 v and Vref = 5v V0 = 10 sin &#x3C9;t +10+5 = 10 sin &#x3C9;t + 15
• 11. Waveforms for +vref and &#x2013;vref :
• 12. CLIPPER&#xF0C6; Clipper are circuits which can clipp off a portion of the input waveform without distorting the rest of the waveform.&#xF0C6; Clipping circuits are also refer limiter amplitude selectors or slicers.
• 13. 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.
• 14. Positive clipper :
• 15. Positive clipper waveforms :
• 16. 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.
• 17. Negative clipper circuit :
• 18. Negative clipper waveforms :
• 19. PEAK DETECTORSDetector : The maximum value is called detectorPeak 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.
• 20. 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.
• 21. Basic peak detector :
• 22. Peak detector waveform :
• 23. Thank you