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Analog Electronic Circuits

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Transistor Biasing and Stability

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What is the need of biasing for a transistor?

Under normal operating condition, the base-emitter junction is forward biased and the collector-base junction is reverse biased. The biasing arrangement is required to establish a stable Q-point which indicates the desired mode of operation.
If the transistor is not biased adequately, a distorted output signal is obtained from transistor. Due to temperature variation, transistor parameters are changed and the operating point gets shifted and the amplifier output will be unstable.