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β = 100

β = 300

% Change

VCEQ

16.68 V

16.53 V

0.9 %

ICQ

3.09 mA

3.13 mA

1.29 %

4 Resistor Bias Circuit –Example (3)

The above table shows that even with wide variation of β the bias points are very stable.

31

Four-Resistor Bias Network for BJT

=

1

=

=

1

2

= 4 = 12 ,000

1

2 + ++ + 0.7 +16 ,000 (β +1) 1 2

1

+

2

∴=

=β

4 V 0 7V -.

=

  • +

    (β +1)

= 201 μA

1 . 2 3 × 1 0 6 Ω

= 2.68 μA

β = 75

=(β +1) =−

=204 μA

=

+

α

= 4.32 V

μ

32

16

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