Introducing a resistor in the emitter of a common amplifier

Home » Physical Electronics Devices and ICs » Physical electronics devices and ics miscellaneous » Question

Introducing a resistor in the emitter of a common amplifier stabilizers the dc operating point against variation is—

1. Only the temperature
2. Only the β of the transistor
3. Both temperature and β
4. None of above

Correct Option: C

Introducing a resistor in the emitter of a common emitter amplifier stablize the dc operating point against variation by both temperature and β. We know that dc operating point or quicecent point or Q-point depends mainly on the following parameter.
● ICBO or ICO (i.e. leakage current)
● VBE (i.e. cut-in voltage)
(1 and 2)These two parameters are totally temperature dependent
● β (i.e. changes by changing the transistor)
Hence alternative (C) is the correct choice.