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Four-Resistor Bias Network for BJT: Design Guidelines

  • Choose Thévenin equivalent base voltage

4

2

  • Select

to set

=9 .

1

=

9

  • Select

to set

= 10 .

2

=

10

  • is determined by

and desired

.

  • is determined by desired

.

35

Four-Resistor Bias Network for BJT: Example

and

Design 4-resistor bias circuit with given parameters.

= 750 μA, β

100,

= 15 V,

Forward-active operation region,

=5V = 0.7 V

Divide = 10 V

equally between

and

. Thus,

=5V

=

= 6.67 kΩ

2 =10 = 75.0 μA

1 = 9 =67.5 μA

=

= 6.60 kΩ

= =

β

  • +

    = 5.7 V

= 7.5 μA

1

2

=

=

9

=84.4 kΩ

10

=124 kΩ

36

18

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