The analysis or design of a
transistor amplifier requires knowledge of both the dc and
ac response of the system.In
fact, the amplifier increases the strength of a weak signal
by transferring the energy from
the applied DC source to the weak input ac signal
• The analysis or design of any
electronic amplifier therefore has two components:
• The dc portion and
• The ac portion
During the design stage, the
choice of parameters for the required dc levels will
affect the ac response.
What is biasing
circuit?
• Once the desired dc current and
voltage levels have been identified, a network
must be constructed that will
establish the desired values of IB, IC and VCE, Such a
network is known as biasing
circuit. A biasing network has to preferably make
use of one power supply to bias
both the junctions of the transistor.
Purpose of the
DC biasing circuit
• To turn the device “ON”
• To place it in operation in the
region of its characteristic where the device
operates most linearly, i.e. to set up the initial
dc values of IB, IC, and VCE
Important basic relationship
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