Physics · Semiconductors, semiconductor diode: I-V characteristics in forward and reverse bias, diode as a rectifier
In a transistor, forward bias is always smaller than the reverse bias. This is d
In a transistor, forward bias is always smaller than the reverse bias. This is done to :
- A. Maintain constant current supply
- B. get good output
- C. Avoid excessive heating of transistor
- D. Maintain flow of majority charge carriers
Step-by-step solution
In a transistor, the base-emitter junction is forward biased with a small voltage (typically 0.7V for silicon) to allow current flow, while the base-collector junction is reverse biased with a larger voltage. This configuration ensures that the transistor operates in the active region. If the forward bias were larger, it would increase the base current, leading to a larger collector current and consequently more power dissipation, causing excessive heating. Therefore, the forward bias is kept smaller than the reverse bias to avoid excessive heating and maintain proper operation.