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Diode Circuits

Diode Circuits. Voltage Regulation. Rectifier Circuit. c03f34. Half-Wave Rectifier. T in. Cause of ripple: the capacitor is discharged for almost an entire period. c03f36. inversion. Ripple Reduction: Do not allow the capacitor to discharge so frequently.

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Diode Circuits

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  1. Diode Circuits

  2. Voltage Regulation Rectifier Circuit

  3. c03f34 Half-Wave Rectifier Tin Cause of ripple: the capacitor is discharged for almost an entire period.

  4. c03f36 inversion Ripple Reduction: Do not allow the capacitor to discharge so frequently

  5. An Inverting Half-Wave Rectifier If Vin >0, D1 and D2 are off. If Vin <0, D1 and D2 are on and Vout>0.

  6. An Non-Inverting Half-Wave Rectifier If Vin >0, D1 and D2 are on, Vout>0. If Vin <0, D1 and D2 are off.

  7. Full-Wave Rectifier Inverting Non-Inverting

  8. Full-Wave Rectifier Alternative Drawing Full-Wave A.K.A. Bridge Rectifier Non-Inverting Inverting

  9. Using Constant Voltage Diode Model Vout=-Vin-2VD, on Vout=Vin-2VD, on

  10. Input versus Output |Vin|<2VD,on

  11. Addition of the Smoothing Capacitor

  12. Modification of Ripple Estimation Formula • Modification: • Turn-on voltage • 1/2 to account for inversion of negative • peaks.

  13. Maximum Reverse Voltage VB=VD,on Vp is the amplitude of Vin VA=VP VAB=VP-VD,on Maximum reverse voltage is approximately Vp

  14. Compare Maximum Reverse Bias Voltage to Half-Wave Rectifier A reverse diode voltage must sustain larger reverse bias voltage

  15. Currents as a function of time

  16. Application of Bridge Rectifier

  17. Summary

  18. Application of Limiting Circuits Limit the signal amplitude at a suitable point in the receiver

  19. Characteristic of a Limiting Circuit

  20. A Simple Limiter

  21. General Limiter Circuit

  22. Application of Voltage Doubler Electronic systems typically provide a global supply voltage: 3V Design of some circuits will be simplified if they from a higher supply voltage.

  23. Voltage Doubler Floating Capacitor Capacitor Divider

  24. Capacitor Diode Circuit Ideal diode. Vout pinned to 0 V Positive charges begin to leave the left Plate of C1, turning D1 off. C1 is now a floating capacitor

  25. Generating 0 to 2Vp Waveform

  26. Peak Detector

  27. Voltage Doubler 0 to 2Vp waveform Peak Detector

  28. Diode as a Voltage Shifter Application: We may need to shift the average level of a signal up and down because the subsequent stage (e.g. an amplifier) may not operate properly with the present dc level.

  29. A Simple Level Shift

  30. Shift up the DC by 2 VD, On

  31. A simple electronic switch CK is 1: I1=1, diodes are shorted, and Vin=Vout. CK is 0,diodes are off, charges are stored across C1.

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