Discussion
Why must a transistor amplifier be biased?
Answer: A
Bias establishes a quiescent point so that the whole signal excursion stays inside the active region, with neither peak driven into cut-off or saturation. Limiting current, matching impedance and protecting the junction are all real concerns addressed by other parts of the design. Since a transistor conducts in one direction only, an alternating signal needs a standing current to ride on, and providing that is the whole purpose of a bias network.
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