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JFET as current source, JFET as controlled resistance, Transfer Video Lecture | Crash Course for IIT JAM Physics
FAQs on JFET as current source, JFET as controlled resistance, Transfer Video Lecture - Crash Course for IIT JAM Physics
| 1. What is JFET and how does it work as a current source? |  |
Ans. JFET stands for Junction Field Effect Transistor. It operates by controlling the current flow through a channel of semiconductor material. As a current source, JFET maintains a constant current in the circuit, even with varying load conditions. It achieves this by adjusting the voltage applied to its gate terminal, thereby controlling the width of the conducting channel.
| 2. How can a JFET be used as a controlled resistance? | |
Ans. JFET can be utilized as a controlled resistance by operating it in the ohmic region. In this region, the JFET acts as a variable resistor, where the resistance can be adjusted by varying the voltage applied to its gate terminal. By changing the gate-source voltage, the JFET's channel resistance can be controlled, allowing it to function as a variable resistor in the circuit.
| 3. What is the transfer characteristic of a JFET? | |
Ans. The transfer characteristic of a JFET represents the relationship between the input voltage (VGS) and the output current (ID) of the device. It shows how the JFET responds to different input voltages and provides information about its amplification and control capabilities. The transfer characteristic curve typically exhibits a linear region, a pinch-off region, and a saturation region.
| 4. How does a JFET differ from a BJT (Bipolar Junction Transistor)? | |
Ans. JFET and BJT are both types of transistors, but they differ in their construction and operating principles. Unlike JFET, which is a unipolar device, BJT is a bipolar device that uses both majority and minority charge carriers. JFET operates based on the control of voltage, while BJT relies on the control of current. Additionally, JFET is voltage-controlled, while BJT is current-controlled.
| 5. What are the advantages of using JFET as a current source or controlled resistance? | |
Ans. Some advantages of using JFET as a current source or controlled resistance include:
- JFET provides a stable and constant current output, making it suitable for various applications.
- It offers high input impedance, minimizing the loading effect on the previous stage of the circuit.
- JFET can operate at high frequencies, making it suitable for amplification and signal processing.
- It has a simple and compact structure, making it easy to integrate into electronic circuits.
- JFET exhibits low noise characteristics, making it useful in sensitive applications such as audio amplification.
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Dec 27, 2024 Last updated |
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