PDF Notes: module 4 notes

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    What is a P-N Junction Diode?

    Allows current to flow in one direction only.

    What happens in Zero Bias condition?

    No external voltage is applied, leading to charge carrier diffusion.

    What is Forward Bias?

    P-type terminal is positive, allowing current flow.

    What occurs during Reverse Bias?

    Increased depletion width prevents current flow.

    How does the V-I characteristic behave in Forward Bias?

    Current increases sharply after overcoming potential barrier.

    What is a Halfwave Rectifier?

    Converts AC voltage to pulsating DC using one diode.

    What is a Fullwave Rectifier?

    Converts both halves of AC cycle into pulsating DC.

    What is a Zener Diode?

    Maintains constant voltage across it in reverse bias.

    What is the function of a Varactor Diode?

    Acts as a voltage-controlled capacitor.

    What is a Light Emitting Diode (LED)?

    Emits light when forward biased due to electroluminescence.

    What is a PIN Diode?

    Contains an intrinsic layer for charge storage and RF applications.

    What is a Tunnel Diode?

    Exhibits negative resistance due to quantum tunneling.

    What is a Photodiode?

    Converts light energy into electrical current.

    What is a Bipolar Junction Transistor (BJT)?

    Amplifies signals using two p-n junctions.

    What are the operating regions of a BJT?

    Active, saturation, and cut-off regions.

    What is a MOSFET?

    Voltage-controlled device used for switching and amplifying.

    What is the difference between Enhancement and Depletion MOSFET?

    Enhancement requires positive gate voltage; depletion is ON by default.

    What is a JFET?

    Voltage-controlled device relying on majority charge carriers.

    How does gate voltage affect a JFET?

    Increases reverse bias, narrowing the current path.


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