ECE3050AnalogElectronicsQuiz2
May 23, 2008
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1. For the circuit given, V+=15V,V−=−15 V,R1=30kΩ,R2=10kΩ,R5=9.2kΩ,ID=1.5mA,and
IC=1.25 mA.FortheMOSFET,ID=10
−3×(VGS −2)2.FortheBJT,VBE =0.65 V and β=49.
(a) Solve for R4for the specified ID.
VGG =V+R2+V−R1
R1+R2
=7.5V RGG =R1kR2=7.5kΩ
VGS =rID
K+VTO =3.225 V R4=VGG −V−−VGS
ID
=2.84 kΩ
(b) Solve for R3for the specified IC.
VBB =V+−IDR3RBB =R3
VBB −V−=IC
βRBB +VBE +IC
αR5
=⇒V+−IDR3−V−=IC
βR3+VBE +IC
αR5
=⇒R3=
V+−V−−VBE −IC
αR5
IC
β+ID
=11.55 kΩ
1