In a PNP Transistor voltage divider biasing ____ resistors are used:

Question

Question

This question was previously asked in

RRB ALP CBT 2 Electronic Mechanic Previous Paper: Held on 23 Jan 2019 Shift 1

Answer 1

Voltage Divider Bias:

EE Analog Test2 1 Images Q34.1.

This configuration provides the highest stability among all the configurations.
Here the common emitter transistor configuration is biased using a voltage divider network to increase stability.
4 resistors are used.

Important Points

Fixed bias:

EE Analog Test2 1 Images Q34.

The above circuit is called a "fixed base bias circuit" because the transistors base current, IB remains constant for given values of VCC.
With this single resistor type of biasing arrangement the biasing voltages and currents do not remain stable during transistor operation and can vary easily.

Collector Feedback Bias:

EE Analog Test2 1 Images Q34.2.

This is a beta(β) dependent biasing method which requires two resistors to provide the necessary DC bias for the transistor.