EE 332 Lecture 14 2019.pdf - EE 332 Devices and Circuits II Lecture#14 ©UWECE TC Chen TWO-RESISTOR BIAS NETWORK FOR BJT EXAMPLE Problem Find Q-point

EE 332 Lecture 14 2019.pdf - EE 332 Devices and Circuits II...

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4/23/2019 1 ©UWECE TC Chen EE 332: Devices and Circuits II Lecture #14 ©UWECE TC Chen TWO-RESISTOR BIAS NETWORK FOR BJT: EXAMPLE Problem: Find Q-point for pnp transistor in 2-resistor bias circuit with given parameters. Given data: b F = 50, V CC = 9 V
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4/23/2019 2 ©UWECE TC Chen TWO-RESISTOR BIAS NETWORK FOR BJT: EXAMPLE Assumptions: Forward-active operation region, V EB = 0.7 V Analysis: V 18 2 V 88 2 1000 9 mA 01 6 50 A 120 000 69 V 7 0 V 9 51 1000 000 18 9 1000 000 18 9 . . ) ( . , . ) ( , ) ( , BC B C EC B C B B B EB B C B EB V I I V I I I I I V I I I V Forward-active region operation is correct Q-point is : (6.01 mA, 2.88 V) ©UWECE TC Chen DESIGN FOR b -INDEPENDENT BIASING 4- RESISTOR SYSTEM Assuming doing a 5% level design, in general, b ? is large, and if 𝛽 ? = 100 or more, then 𝐼 ? < 1% of 𝐼 ? 𝐼 ? can be ignored since it generates 1% error with 5% level design. V CC =9 V Q1 R 1 R 2 R C R E I C I B
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4/23/2019 3 ©UWECE TC Chen FOUR-RESISTOR BIAS NETWORK FOR BJT: DESIGN OBJECTIVES We know that 𝐼 ?
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