fundamentals of microelectronics · 2015-12-18 · microsoft powerpoint - f-slide7.ppt...
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Fundamentals of Microelectronics
CH1 Why Microelectronics? CH2 Basic Physics of Semiconductors CH3 Diode Circuits CH4 Physics of Bipolar Transistors CH5 Bipolar Amplifiers CH6 Physics of MOS Transistors CH7 CMOS Amplifiers CH8 JFET Transistor
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Chapter 8 JFET Transistor
Physics of Operation
I/V Characteristic
Biasing
Small-Signal Model
JFET Amplifier
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JFETساختار فيزيکی Junction Field Effect Transistor
Figure: n-Channel JFET.
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Figure: The nonconductive depletion region becomes broader with increased reverse bias.(Note: The two gate regions of each FET are connected to each other.)
به ازای ولتاژ های مختلف گيت JFETعملکرد
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ادامه
الکتريکی در اين ترانزيستور عبور حامل های بار تحت تاثير پتانسيل گيت و يا به عبارت ديگر ميدان.عرضی ناشی از گيت است
اين ترانزيستور جزء دسته ترانزيستورهای تک قطبی)Unipolar ( است چراکه در آن فقط حامل.های اکثريت در برقراری جريان ايفای نقش می کنند
transversal fieldis used to control
Channel
JUNCTION FET: depletion layers of pn-junctions close the channel
Flow
depletion layer
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Figure: Circuit for drain characteristics of the n-channel JFET and its Drain characteristics.
:ناحيه اهمی يا مقاومتی يا تريود يا خطی
0,2 22 GDSDSPGS
P
DSSD IVVVV
VI
I
0,2
2 GPGS
P
DSSD IVV
VII
2
1
P
GSDSSD V
VII
کوتاه اتصال ازای به ترانزيستور اشباع ناحيه در درين جريان را DSSI و off-pinch ولتاژ را pV باال روابط در.است شده تعريف يکديگر به S و G های گره
off-pinchناحيه اشباع يا فعال يا
PGDPGS VVVV ,0
Nنوع JFETولتاژ -مشخصه جريان
PGDPGS VVVV ,0
or
:ناحيه قطعPGS VV
0,0 GD II
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Figure: Transfer (or Mutual) Characteristics of n-Channel JFET
2
1
P
GSDSSDS V
VII
IDSS
VGS (off)=VP
off-Pinch ناحيه در GS/VDI مشخصه
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ID/VDS مشخصه
22 2 DSDSPGS
P
DSSD VVVV
VII
2
1
P
GSDSSD V
VII
PGD VV
PGD VV
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Figure: Typical drain characteristics of an n-channel JFET.
Saturation or Pinch off Reg.
Locus of pts where PGSDS VVV
ID/VDS مشخصه
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نماد الکتريکی
G
D
S
n-channel JFET
G
D
S
G
S
D
p-channel JFET
ID ID ID
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11
JFETنمونه ای از يک
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JFET باياس
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مثال
2
1
P
GSDSSD V
VII mAIVV
DSS
P
93
Determine the operating point.
Assume pinch-off region:
mAIormAIIIIVIkV
VIDD
DD
DGSDs
GSD 21
3219
223
19 22
PGSD
PGSD
VVVmAI
VVVmAI?
?
42
21So ID=2mA is not acceptable.
)3(26622101?
PGSDSDDDSD VVVVIkIkVmAI
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مدل سيگنال کوچک
DSSDP
m IIV
g 2
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مشترک-تقويت کننده سورس
dLout
in
dLmV
rRRR
rRgA
||
||
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مشترک-تقويت کننده گيت
dLout
mind
dm
Ldin
dLmV
rRRg
Rrifrg
RrR
rRgA
||
11
||
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مشترک-تقويت کننده درين
dm
dLout
in
mdL
dLV
rgr
RR
Rg
rR
rRA
1||
1||
||