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Find VE and IE for the circuit given below
1 Answer
written 3.9 years ago by |
Answer:
Given : RB=270kΩ,RE=1.5kΩ,VEE=5V,β=100
To Find: VE=?,IE=?
Solution:
Applying Kirchhoff's voltage law to the input circuit of the above figure, will result in
−IBRB−VBE−IERE+VEE=0
but IE=(β+1)IB
and VEE−VBE−(β+1)IBRE−IBRB=0
with IB=VEE−VBERB+(β+1)RE.....(1)
Substituting values to the equation (1) yields,
IB=5V−0.7V270kΩ+(101)(1.5kΩ)
=4.3V270kΩ+151.5kΩ=4.3V421.5kΩ
=10.2μA
Hence,
IE=(β+1)IB=(101)(10.2μA)
=1.03mA
∴VE=IERE=(1.03mA)(1.5kΩ)=1.545V