KNUSTals

oknownasMITofAfr
icahasso
mes t
uden
tswh oar
esup
pos
edt
operf
ormanexper
imen
twi
tha
semico
nduct
ordev
ice
.En
gine
erCo mmeydes
ir
estoobt
ainsa
meh o
lea
ndel
ect
rondr
if
tcur
rent
.Howi
s
car
ri
ercon
cent
rat
io
nssup
posedtobechos
en?

Pa
rap
hra
sedp
lea
se

*
car
ri
erd
ens
it
ie
s

Ho
wdo
esaf
ull
wav
ere
cti
fi
era
ffe
ctt
her
ipp
lee
ffe
ct

Ho
wisCo
ll
ect
orc
urr
enta
ffe
cte
dbyt
emp
era
tur
eint
hee
ber
smo
llt
ran
sis
tor

Mo
del
oft
ran
sis
tor*

Dr
awt
hec
har
act
eri
st
ic
soft
heJ
ET

S
hat
taWa
leaf
orme
rel
ect
ri
cal
eng
ine
eri
ngs
tud
entd
eci
dedt
obl
ows
omewa
tts
.

I
s=6
*10^
-16
,th
epe
ako
utp
uto
fth
emi
cr
oph
ones
ign
ali
s20mVc
alc
ula
tet
hep
eako
utp
utv
olt
age

S
ket
chan
oni
nve
rti
ngo
pamp
(fi
ni
teAo
)an
dde
riv
eth
efo
rmu
laf
ori
tsg
ain

S
ket
chas
qua
rer
ootOpa
mp

I
tiscon
nec
teda
cro
ssad
iod
e..
Ske
tcht
her
esp
ons
eoft
hed
iod
ean
dwr
it
eane
xpr
ess
ionf
ort
hed
iod
e
c
urre
nt.

Vp
<<Vt

S
tat
e4c
har
act
eri
st
ic
sofa
nid
eal
Opa
mp

As
inus
oid
alwa
vewi
thawa
vef
ormVpa
ndad
cvo
lta
geVoi
sint
hef
ormV(
t)
=Vo+Vp
cos
wt

Dr
awt
heI
Vch
ara
cte
ris
ti
cso
fap
inp
hot
ode
tec
tor

I
Vch
ara
cte
ris
ti
cso
fJF
ET

S
tat
eth
eco
ndi
ti
onf
orBe
tai
nse
nsi
ti
vi
tyf
ors
elfb
ias

Ane
ngi
neera
tawire
les
sb as
estat
io
nreal
iz
edh
isr
ece
ive
rwa
sre
cei
vi
ngh
ighs
atur
ati
onc
urr
ent
.Us
ea
MOS
FETtodes
ignavar
iab
legai
ncir
cui
t.

*
note
xac
two
rdst
ho

Ex
pla
inc
han
nel
pin
cho
ffi
nMOS
FET
Dr
awar
ect
if
ie
rdr
iv
ingar
esi
st
iv
elo
ad

Ho
wth
ech
ann
elo
fth
eJF
ETi
sfo
rme
d??

De
scr
ibeh
owt
hec
han
nel
inaMOS
FETi
sfo
rme
d.

Wh
yist
henc
han
nel
JFETr
efe
rre
dtoa
sSt
ati
c

2a
dva
nta
geso
fFETOVERBJ
T

Ex
pla
inc
uto
ffp
oin
toft
heBJ
T

Wr
it
eane
qua
tio
nth
atr
ela
test
het
ri
odea
ndp
inc
hof
fre
gio
noft
ran
sis
tor
.

Ex
pla
int
hea
cti
vemo
deo
faBJ
T

S
ket
char
ect
if
ie
rsup
ply
ingar
esi
st
iv
elo
ad

Wr
it
eth
eEi
nst
ei
n'
seq
uat
io
nsh
owi
ngt
her
ela
tio
nbe
twe
enmo
bil
i
ty,
dri
ft
/di
ff
usi
onc
urr
ent
s.

*
reg
ion

I
dea
ltr
ans
ist
ori
nst
eadi
thi
nk