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Diode Circuits

Diode Circuits. Limiting Circuits Voltage Doubler Voltage Shifter Diode Mixer. Application of Limiting Circuits. Limit the signal amplitude at a suitable point in the receiver. Characteristic of a Limiting Circuit. A Simple Limiter. General Limiter Circuit. Application of Voltage Doubler.

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Diode Circuits

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  1. Diode Circuits

  2. Limiting Circuits • Voltage Doubler • Voltage Shifter • Diode Mixer

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

  4. Characteristic of a Limiting Circuit

  5. A Simple Limiter

  6. General Limiter Circuit

  7. 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.

  8. Voltage Doubler Floating Capacitor Capacitor Divider

  9. 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

  10. Generating 0 to 2Vp Waveform

  11. Peak Detector

  12. Voltage Doubler 0 to 2Vp waveform Peak Detector

  13. Voltage Doubler

  14. Voltage Doubler (470 nF, 1M)

  15. Voltage Doubler (470nF, 100K)

  16. Voltage Doubler

  17. Voltage Doubler(100 uF, 2.5 Kohm)

  18. 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.

  19. A Simple Level Shift

  20. Shift up the DC by 2 VD, On

  21. Diode Mixer transformer transformer A diode mixer produces frequency components at sum and difference frequencies.

  22. Va>>Vc Node a and node c appear as short to node b. Voltage at node d is routed to the IF port

  23. Va<<Vc Node a and node c appear as short to node d. Voltage at node b is routed to the IF port

  24. Frequency Spetrum

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