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Q. Why we Need biasing?
Need for biasing : Baising is necessary to establish the quiescent operating point so that the device operates with the linear region without exceeding the maximum power dissipation curve.
Operating point or quiescent point: It is fixed in the active region of the transistor characteristics within the maximum constraints it either shortens the life time of the device or destroys the device. The operating point is fixed for a particular value of base current IB , collector current IC and collector emitter voltage drop VCE. If any of these parameters change them, the quiescent point tends to change.
Factors affecting Q-point
· Change in ß
· Changes in temperature
Effect of change in temperature on VBE
VBE decreses by 2.5mV per degree C in temperature the base current IB is fixed bias .with the increase in temperature the base-emitter voltage VBE decreases which inturn increases the difference between VBE and collector biasing voltage VCC and therefore base current IB increases.even a small increase in IB increase collector current IC to a larger extent and VCC drops .Hence the Q-point fixed on these two parameters varies.
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Determine the change in IC from 25ºC to 175ºC for the transistor defined in this table for fixed-bias with RB = 240 k and = 100 due to the S(VBE) stability factor.
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NPN BJT with forward-biased: An NPN transistor can be referred as two diodes along with a shared anode. In common operation, the base-emitter junction is forward biased and th
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