electronics 1 lec1116
TRANSCRIPT
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Chapter 7: FET BiasingChapter 7: FET Biasing(7.1-7.6)(7.1-7.6)
Instructor: Xuewei Zhang
11161!
BoylestadE"ectronic #e$ices an% Circuit Theor&E"ectronic #e$ices an% Circuit Theor&
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Electronic Devices and Circuit TheoryBoylestad
2013 by Pearson Higher Education, nc
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Co''on FET Biasing Circuits
FET Biasing Circuits.i/edBias
#elBias
oltageDivider Bias
#-T&pe *+FET Biasing Circuits#elBias
oltageDivider Bias
E-T&pe *+FET Biasing Circuits.eedbac ConigurationoltageDivider Bias
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Electronic Devices and Circuit TheoryBoylestad
2013 by Pearson Higher Education, nc
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,-Channe" FET +&'o"
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Electronic Devices and Circuit TheoryBoylestad
2013 by Pearson Higher Education, nc
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FET *peration Characteristics
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Electronic Devices and Circuit TheoryBoylestad
2013 by Pearson Higher Education, nc
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FET Transer Characteristics
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Electronic Devices and Circuit TheoryBoylestad
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2
1
=
P
GS
DSSDV
VII
Basic Current /e"ationships
For a"" FETs:
-0IG
SD II =
For FET+ an% #-T&pe *+FETs:
For E-T&pe *+FETs:245
TGSD VVkI =
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Electronic Devices and Circuit TheoryBoylestad
2013 by Pearson Higher Education, nc
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Fi0e%-Bias Coniguration
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Electronic Devices and Circuit TheoryBoylestad
2013 by Pearson Higher Education, nc
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Electronic Devices and Circuit TheoryBoylestad
2013 by Pearson Higher Education, nc
!""er #addle $iver, %e& 'ersey 0()*+ -ll $ights $eserved
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Electronic Devices and Circuit TheoryBoylestad
2013 by Pearson Higher Education, nc
!""er #addle $iver, %e& 'ersey 0()*+ -ll $ights $eserved
+e"-Bias Coniguration
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Electronic Devices and Circuit TheoryBoylestad
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+e"-Bias Coniguration
0=GV
DDDDSDSD RIVVVV =+=
ow %oes the stai"i2ation wor34
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Electronic Devices and Circuit TheoryBoylestad
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Electronic Devices and Circuit TheoryBoylestad
2013 by Pearson Higher Education, nc!""er #addle $iver, %e& 'ersey 0()*+ -ll $ights $eserved
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Electronic Devices and Circuit TheoryBoylestad
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5o"tage-#i$i%er BiasIG6 0 -7 IDres"onds to changes in VGS8
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Electronic Devices and Circuit TheoryBoylestad
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5o"tage-#i$i%er Bias Ca"cu"ations
The 9"oint is established by "lotting a line that intersects the transer curve8
21
2
RR
VRV DDG
+
=VGis e:ual to the voltage across divider resistor R2;
!sing a&;SDGGS
RIVV =
SDS
DDDDD
SDDDDDS
RIVRIVV
RRIVV
=
=
+= 45
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Electronic Devices and Circuit TheoryBoylestad
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5o"tage-#i$i%er -ointPlot the transer curve by "lotting IDSS, VPand the calculated values o ID
Plot the line that is deined by these t&o "oints;
VGS6 VG, ID6 0 -
VGS6 0 , ID6 VG? RS
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Electronic Devices and Circuit TheoryBoylestad
2013 by Pearson Higher Education, nc!""er #addle $iver, %e& 'ersey 0()*+ -ll $ights $eserved
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Electronic Devices and Circuit TheoryBoylestad
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o'ewor3 8ssign'ent 9(a)
Due at 10a@, Aednesday, 11?2* Cha"ter ( "roble@s; ),*,,10,12,1),1