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Biasing Circuit

Biasing Circuit. Establish a constant voltage V B. Current-derived negative feedback.The degree of success of the negative feedback is Bias Stability. cut-off conditions ,. Example.

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Biasing Circuit

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  1. Biasing Circuit • Establish a constant voltage VB. • Current-derived negative feedback.The degree of success of the negative feedback is Bias Stability.

  2. cut-off conditions,

  3. Example • A transistor is to be biased at a collector current of 1 mA when a 12-V power supply is applied. Using the above figure, determine the values of R1, R2, and RE if 3.4 V is to be dropped across RE and if the current through R2 is to be 10 IBQ. Assume that for the transistor used, VBEQ = 0.6 V and hFE = 100.

  4. Example Also, VB = VRE + VBE = 3.4 + 0.6 = 4 V. VR1 = VCC – VB = 12 – 4 = 8 V

  5. Common Emitter Amplifier

  6. Common Emitter Amplifier

  7. Common Emitter Amplifier Transconductance=how much ICchanges with a fluctuation in VBE. In practice, VT =26 mV at room temperature The terminal voltage gain is therefore

  8. Model • Basic Equation • Equivalent Circuit • Simulation model

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