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Zemes Diode
De hin itien I Aemicenduehng deuice
hauig two higbly dajed Conduting
laues.tuso eamainal dnd ne juion
Zemes diode is bi- duectional
deuice senicDnduchng

T# oherade in both foruad biasing and

Revense biading
2) Zemes dBode
layes ae highly dhed as cembaked to omat
- ido
’ Nohnal diode i - o1
3Zemer diode -
(3) Zemer dinde is o boattive sesiattue deuie.

() The width debleion layer. in zenen

.
diode than that o Aomal diode
dmalleh than
(5) Th attenqth baies sield acbAA the
langer in zenes dipde as
Compared to Nnhmaldiode..
eeee

o0o
oeeee

6) At veay hih valo o Revesse bias ualtage,

Zemer beakabuwM takeA þlace in zen diode
Zenen brea kd on -a) Osehul breakdown B Ngt ber manent
Zonea dinde i usegas fea Yolkage gulatin biaig
OR
Anode
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Metaltictortact
pt

Anode Cothode
-debletiomtaye
(ao nmpbile hage ien
Zeme diode consizt
top hiahly doped
Aemiconductin laye ie pt andN
hhen pt amd Nt layers are /oined
estat Howem AN to p+ ide and holes taethery
Hat
m.
oL)m pt to N* side due o conermbatiin
eamd holes
Cembiinatien ta kes hlace neas the junctiem. Du to
hi, a debleien layer id tormed amd change
jasmed
Due to immobile ion tutthen combnaten
thede
holed ond estopA that} hy the ield dus
to these fmmobile ionsa cotod baien hield
amd the botentol d e to thee immobile im
is called pokmial haiiea
Zenen diode Censist o too deaminal
pt yermpal |a Arude tenmimal
I4 iu a eminal thygh
which toÀuAhd erent ente amdevere Curet
leave
(2) Nt terminal Cathoele denai m)
though uohich korand cwne nt <eave and
ever eCuthent eTder
 Page No.
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aozkiyg Zenes Diode i
Tt wAks im two nmodes

fakiatd biusing Mode. Eext

loe e
te Eext and Eh
le e are obboAile to
Ye each otho

pt erminal
Cemtared to Nt termialL
Ae we apbly the Foroahd bias Notage
exden nal elecic Held create sern
fuom pt o Nt
ahich i ophoditeto basnien hield. Dw to
thii net elect ic held aDs the baien.
de chsase as a sesut th
ouw of elechemem
Nt to pt stast, dug to ths a jaand
farANd euend
stant hou Enet = À-Eext
the
3) Ih
T we bwtthen innease, the harwand hiaa
valtage bannie podetial hun th decsease
à sesalt foruand cusren furthe inaease
AB_a patiulan alua o ferward bjad yoltape,
bannie þodemhal
bolemtal becer
becerme zeo This bDeTial
iA called
A! ths Comditim, a lazge foward cwre ent
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D"zy fr Ge

In feroand biasing ceent u plowig due

to majoity change 'catiens and
dtrection hempt to t auig
NoTe i Thi soh lo hd chahacleniHia
dicde mDAma díode u idenical.

Kevese Biasigg Made i H.p.

Staoity change
pt Care

Maiosiky chas lol

Minzit harg
Minoity e

Ent

In Kevesie biaking pt deminal iA at

bo tenial as Cemþared to Nt teminal
we aty Reveye bias voltage, Net
held the baien inhe QLed becae
bazie hield and erden nal field ave
same direction
Enet
In Revese binsing, nayobiy chage cazitas
ahe
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qmd nninokig charqe cathiehA ane mouing towand

he dsplelibn layoi.
loyeh due to the met elktate gield
Htnte, nly mingzty charge Cauiess ahe sl honiible
fo Cuhhet blouo n hevense biasing
biasing , thiù cihset
Reveeateaion chtmt
Tn ReveNse biaaina, cuhhent iaowing due to
minokity chage canales and hauiry
dlecien hem Nt to p teminald
As we kutheh nceALe the. heverse bias valtage,
zeni beak down takeu lace as a sesulta
large a0ouont cWsint Hast oww sem Nt to Pt
lange Fohdd

2ene

VFonuasd valioe)
Retgtturent

Zener bxeak dosn o H.

pt

+
V<ReibAe
Voltag biaa}
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AB veay high valu of heyerse bias voltage,

electic hield (Enet acrDss thÁ
bakhte beconnes
becomes vet high
Due to thiu e comin out hrom the fom
oAide he
dehletion lae.

EEeEext Due to this bhag keetd ethole bait caatu

inside depleion ayer
he
Gected duo to
Ahongelecic hield and the Aike heith
Qndthe
ionA amd bomda A
holes Cheased This peoces sepeat tonimously
due to thiA lange ererAe cwhhenttat yo
This (omditim icolled Zener bzeakdosy
Zene bheakdon a mot beximament: Thati

Hois the zener b eakdousn votage vay Loith ehnh?

AA we imlase he ewwitha
the ucleus de chease . So we meedAmall ield
the e on ink Hence, use cam
thot breakdnyan Noltage decrease
wth nease demhenacthuxe
Chaacka Reves
utics aageLenes diode

(2nen break
down vollag
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Characea tsttes o! IdealZemeh diode -

I=0

Zene
Kzen!

CaseT i- Eo LANd Biasing i

hen V<Ve
in toruand biasing hen
amd zene diode
the valuo ot T s
behaves Iike an obe
cùcuit
ahen then.
the will be equal to kmee Voltage (l
amd
diode
Volt.,
hehe
uhhent
behavea like baty
oung Then, zeHer

Case IT Kevehse Biasing i

When V< Vz. them
Zemehdiode behayesike bben cicit
be ol in his cendHon.

the
zenu sill be in OAstate Qnd zener dode
behave like batey
Vz
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Abhlication a Zemek dipde i
VolHage Kulatu

zemer diode u in heverse biased cond ifib.

No, we oil) check that zemer is "DN" oR bEe"
StebI Eind the voltage acrosd Ke, because
volBage acrDse RelVaLJevesse bias the
ZeN diode.
Asaume zemea diocle ia not bhelent
tAAAAAF

KVL h hii cicuit

Aby
I
R+RL
R+R

Steb 2 Case T Whem VAL KVz zene ol

opencúrud
R+R
#
R+RL R+R

NEVeY R
R+RL
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(zeme "oN
R
IAL
Equiualent diagam -R

R
Aþbly kyL t A:- TR -I, 4T -0

AA
(2 kn)

FindHhe alus
Zenen

AAume zeMer diode is mot bhlent

R(R
AAAA TA
(2\7

T:
12
RtR

<VeZener et
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(i)
TA
(iii)

AAA
RLtekn

Zontr"on'

$2K
249
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