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4 Resistor Bias Circuit –Example (1)

i) β = 100

VB = VTH

Vcc R 2 =

R1 + R2

=

30 *1

6.8 + 1

= 3.85V

RB = RTH

=

R1 R2 R1 + R2

=

    • 6.8

      *1

    • 6.8

      + 1

= 0.872kΩ

IB =

VB VBE RB + (1+ β)RE

=

    • 3.85

      0.7

    • 0.872

      + 101*1

= 30.92μA

I

CQ

I

EQ

= βIB = 3.09 mA = (1+ β)IB = 3.12 mA

VCEQ

= VCC-ICRC-IERE = 30-3.09*3.3-3.12*1=16.68V

29

RB = RTH =

R1 R2

= 6.8*1 = 0.872kΩ

R1 + R2

6.8 + 1

4 Resistor Bias Circuit –Example (2)

30

= 3.85V

VCEQ

= VCC-ICRC-IERE = 30-3.13*3.3-3.14*1=16.53V

VB = VTH

Vcc R 2 =

30 *1 =

R1 + R2

6.8 + 1

I

CQ

I

EQ

i) β = 300

= 10.43μA

IB =

= 300IB = 3.13 mA = (1+ β)IB = 3.14 mA

VB VBE

RB

  • +

    (1+ β)RE

=

    • 3.85

      0.7

    • 0.872

      + 301*1

15

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