Question

The demerit of a collector to base bias is_________

(a) its need of high resistance values

(b) its dependence on β

(c) its independence on β

(d) the positive feedback produced by the base resistor

This question was posed to me in semester exam.

My question comes from Collector-to-Base Bias topic in chapter Transistor Biasing and Thermal Stabilization of Electronic Devices & Circuits

Answer 1

The correct option is (a) its need of high resistance values

Explanation: When the stability factor S=1, the collector resistor value should be very large when compared to the base resistor. So, when RC is large we need to provide large power supply which increases the cost. At the same time, as the base resistor is small we need to provide small power supply.