Lec9 Transistor Bias Circuits

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Basic ELECTRONICS (2+1)ENGR MUHAMMAD SHAKEEL AKRAMELECTRONICS ENGINEERING FICT, BUITEMS.

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3CHAPTER 5Transistor bias circuits

4DC Operating Point (Q-Point) Dc BiasEstablishes the DC operating point (Q-point) for proper linear operation Otherwise will go in saturation or cutoff

5DC Bias

6DC Bias

Ic = IBVCE = Vcc IC RC

7DC load line

8Voltage Divider Bias

I2 >> IB (Stiff Voltage Divider)

Stiff Voltage divider: Base voltage is relatively independent of different transistor and temperature effects 8

Voltage Divider Bias

Stiff Voltage divider: Base voltage is relatively independent of different transistor and temperature effects 9

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