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CSIR NET & IIT JAM Previous Year Problem on DC Biasing of Transistor Amplitude Video Lecture | Crash Course for IIT JAM Physics
FAQs on CSIR NET & IIT JAM Previous Year Problem on DC Biasing of Transistor Amplitude Video Lecture - Crash Course for IIT JAM Physics
| 1. What is the purpose of DC biasing in the transistor amplifier circuit? |  |
Ans. DC biasing is used to set the operating point of the transistor amplifier at a specific voltage and current level. It ensures that the transistor remains in its active region and operates in a linear manner. This allows the amplifier to accurately amplify the input signal without distortion.
| 2. How does the DC biasing affect the transistor amplifier's performance? | |
Ans. DC biasing directly affects the gain, linearity, and stability of the transistor amplifier. Improper biasing can result in low gain, distortion in the amplified signal, and unstable operation. Therefore, it is crucial to carefully set the biasing conditions to optimize the amplifier's performance.
| 3. What are the common methods of DC biasing in transistor amplifiers? | |
Ans. The most common methods of DC biasing in transistor amplifiers are fixed bias, self-bias, and voltage divider bias. Fixed bias uses a resistor network to establish a stable biasing voltage, self-bias utilizes the transistor's own characteristics for biasing, and voltage divider bias employs a resistive voltage divider to set the biasing voltage.
| 4. How to calculate the values of resistors in voltage divider biasing? | |
Ans. To calculate the resistors in voltage divider biasing, the desired biasing voltage and the transistor's base-emitter voltage drop are required. The resistor values can be determined using the voltage divider equation: Vbias = Vcc * (R2 / (R1 + R2)). By rearranging the equation, the values of R1 and R2 can be calculated.
| 5. What are the advantages of voltage divider biasing over other methods? | |
Ans. Voltage divider biasing offers several advantages over other methods. It provides a stable and predictable biasing voltage, allowing for better control over the transistor's operating point. It also offers good stability against temperature variations and transistor parameter changes. Additionally, voltage divider biasing is relatively simple to implement and does not require additional components like capacitors or diodes.
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Oct 13, 2025
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