Question

Changes in temperature will affect the level of _______.

• A. current gain $\beta$
• B. leakage current, $I_{Ceo}$
• C. both current gain $\beta$ and leakage current $I_{Ceo}$
• D. Voltage gain

Hint:

In BJTs, both current gain and leakage current are temperature-sensitive due to semiconductor behavior.

Answer 1

The Correct Option is C

1. Leakage current ($I_{Ceo}$): It increases exponentially with temperature. This is due to increased carrier generation in the base-collector junction of a transistor.
2. Current gain ($\beta$): It is also affected as temperature affects mobility and recombination rate of charge carriers in a BJT.
Therefore, both parameters are influenced by temperature.
Voltage gain is mainly a circuit-level parameter and less sensitive to direct temperature variations.