Why Biasing Is Needed in Transistor Amplifier Circuit?

Answer

Biasing is used in a transistor amplifier circuit in order to put the transistor as nearly as possible in the middle of its undeviating region. Transistors have cutoff, linear, and saturation regions. Too little bias power, and you enter cutoff - Too much, and you end up in saturate. Both circumstances cause signal distortion when you try to use the transistor as an amplifier, as opposed to a switch.
Q&A Related to "Why Biasing Is Needed in Transistor Amplifier..."
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As temperature increases the base emitter voltage goes down and the current gain goes up.
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