Chapter 6

Bias and d.c. stabilisation

Bipolar transistors


It is usual to begin the design of a bipolar transistor amplifying stage by choosing a value of mean collector current which enables the required current swing and/or voltage swing to be delivered with an acceptable degree of linearity. The next step is to devise a biasing circuit to give this particular value of mean collector current.

The most obvious way of biasing a bipolar transistor is by the simple circuit of Fig. 6.1 in which a resistor Rb is connected between the base of the transistor and source of steady voltage Vbb. Certainly it is possible by adjustment of Rb and/or Vbb to set the mean collector current at the desired value but such adjustments to individual transistors ...

Get Principles of Transistor Circuits, 9th Edition now with the O’Reilly learning platform.

O’Reilly members experience live online training, plus books, videos, and digital content from nearly 200 publishers.