Subject:- Analog Electronics - 1
Topics to be
covered:- In this lecture we will cover Biasing stabilization of Bipolar
Junction Transistor. Topics to be covered are Transistor Modes, Transistor
current components, Transistor biasing configuration, Common base, common
emitter, common collector and their comparison. Fixed biasing technique, DC
load line, AC load line and finding Q-point, Thermal runaway, self biasing with
negative feedback. This lecture will be very important if you are a GATE
student or a regular engineering student having Analog electronics as the main
subject. Transistor is a three terminal semiconductor device having emitter,
base and collector regions. A transistor can be of two types, npn or pnp. A
transistor needs to be biased before using in amplifier circuit. There are two
types of biasing the transistor, fixed biasing and self biasing. In fixed
biasing operating point of transistor drifts with change in temperature, this
problem is known as thermal runaway. To avoid this problem we use emitter
resistant to provide negative feedback. Thermal runaway can also be avoided by
using bias compensation.
