Clampers and clippers

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  • Thanks for the tutorial, but it appears that there is a mistake in slide #14 : the input terminals of the opamps are interchanged.
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Clampers and clippers

  1. 1. CLAMPINGCIRCUITES,CLIPPER & PEAK DETECTORS Dr. C. Saritha, Lecturer in Electronics S.S.B.N P.G COLLEGE, ANANTAPUR
  2. 2. OVERVIEWINTRODUCTIONDEFINATIONS CIRCUIT DIAGRAMS WAVEFORMS CONCLUSION
  3. 3. INTRODUCTION• Some of the non linear function circuits are : CLAMPERS  CLIPPERS  PEAK DETECTORS
  4. 4. 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.
  5. 5. • Zero volts-waveforms
  6. 6. CLAMPING CIRCUITS:
  7. 7. Waveforms :
  8. 8. Operation of the circuit : input voltagevi = vm sin ω t and vrefInterval 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.
  9. 9. 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 )
  10. 10. Examples : Vm = 10 v and Vref = 5v V0 = 10 sin ωt +10+5 = 10 sin ωt + 15
  11. 11. Waveforms for +vref and –vref :
  12. 12. 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.
  13. 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. 14. Positive clipper :
  15. 15. Positive clipper waveforms :
  16. 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. 17. Negative clipper circuit :
  18. 18. Negative clipper waveforms :
  19. 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. 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. 21. Basic peak detector :
  22. 22. Peak detector waveform :
  23. 23. Thank you

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