Question

State True or False :

The presence of $R_E$ provides negative feedback which stabilizes the circuit against changes in temperature.

• A. True
• B. False

Answer 1

The correct option is A True

An increase in temperature produces an increase in the minority carrier current, but a negative change in $V_{BE}$

So, both effects lead to an increase in collector current with temperature. Since, the emitter resistance shows up in the denominator of both terms, this shows that a large value of $R_E$ is desirable for temperature stability.

The presence of $R_E$ provides negative feedback which stabilizes the circuit against changes in temperature, supply voltage, etc., but it also decreases the voltage gain.