IGNOU BPHET 143 2026 - In the universal biasing of a transistor, which resistor acts as a fee

Question

In the universal biasing of a transistor, which resistor acts as a feedback element? How does it provide stability to the circuit?

19 Jan 2026

Answer :

Word Count : 264

In the universal biasing of a transistor, also known as self-bias or voltage-divider bias with emitter resistor, the emitter resistor (Re) acts as the feedback element. This resistor is connected between the emitter terminal of the transistor and ground, and it plays a critical role in providing stability to the circuit against variations in transistor parameters, especially the current gain (β) and temperature changes. The feedback mechanism works as follows: when the collector current (Ic) tends to increase due to an increase in β or temperature, the emitter current (Ie) also increases because Ie ≈ Ic in a transistor. As Ie increases, the voltage drop across

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