1. Diode Circuits Electronic Device Circuits
Hasmukh Goswami Collage of Enginnering, ahmedabad
Diode Circuits
Electronic & communation (sem :3)
Electronic Device Circuits
Patel Prashant :

2. Voltage Regulation
Rectifier
Circuit

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

4. 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
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.