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GROUP 3
CONTROL SYSTEM SCORE:
UNIVERSITY OF PANGASINAN- PHINMA Education Neto!"
Co##e$e o% En$inee!in$ & A!c'itectu!e
(e)a!t*ent o% E#ect!onic+ & E#ect!ica# En$inee!in$
E,)e!i*ent No .
THE COLLPITS OSCILLATOR
Su/*itted /0:
ESTEVES1 FRELYN
UNTALAN1 2ESSIE 2AMESIN2A(A1 2ERA MAE
NAVARRO1 RYAN
(E GU4MAN1 CARL VINCENT(ULAY1 2OHN NICA
UENAVI(E41 GIOVANNI
Su/*itted to:
En$! 2e%%!e0 P e!ida
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Pa!t+
(C .5 V Su))#0
T!an+i+to!: Idea# N 2FET
Re+i+to!+: . "61 .57 "6Inducto!: 8i!tua# 97 H1 ;. *H
Ca)acito!: 8i!tua# 55 )F1 . O+ci##o+co)e
> S)ect!u* Ana#0?e!
Fo!*u#ae
F!e=uenc0 o% O+ci##ation
fc= 1
2 L
1C
1C
2
C1+C
2
Gain
Av=gm rd
Condition %o! O+ci##ation
C1
C2
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R11k
C1180pF
Q1
2N3370
L160H
C222pF
C3
0.8nF
R260k
C40.1F
V112 V
L25.1mH
XSC1
A B
Ext Trig+
+
_
_ + _
; Co*)a!e it' t'eo!etica# ca#cu#ation+:%c *ea+u!edDDDDDDDDDDDD
ca#cu#atedDDDDDDDDDDD
9 Sto) t'e +i*u#ation and )#ace a S)ect!u* Ana#0?e! on t'e
o!"+)ace
R11k
C1180pF
Q1
2N3370
L160H
C222pF
C3
0.8nF
XSA1
TIN
R260k
C40.1F
V112 V
L25.1mH
XSC1
A B
Ext Trig+
+
_
_ + _
Connect t'e out)ut #ead o% t'e o+ci##ato! to t'e in)ut o% t'e
S)ect!u* Ana#0?e!
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P!e++ Set S)an Set Sta!t .7 "H?1 End .7 MH?1 A*)#itude Lin and
Ran$e
5V@(IV P!e++ Ente!.7 Re+ta!t t'e +i*u#ation B'en t'e o+ci##ation
'a+ +ta/i#i?ed1 d!a$ t'e !ed *a!"e! to
t'e )o+ition o% t'e +)ect!u* #ine o/+e!8ed Note t'e %!e=uenc0 in
t'e #oe! #e%t
co!ne! o% t'e S)ect!u* Ana#0?e! indo:
%c DDDDDDDDDDD.. Ca#cu#ate L. nece++a!0 to ac'ie8e a %!e=uenc0
o% o+ci##ation o% < MH? Re)#ace L.
/0 dou/#e-c#ic"in$ on it and +e#ectin$ Re)#ace Run t'e
+i*u#ation to 8e!i%0 0ou!
ca#cu#ation.5 Gi8en t'at $* .9 *+ and !d .5 "61 dete!*ine 'et'e!
o+ci##ation+ i## /e
+u+tained
E,)ected Outco*e
Oc+i##o+co)e
S)ect!u* Ana#0?e!
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Additiona# C'a##en$eRe-de+i$n t'e ci!cuit o% Fi$u!e
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18012
2212
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O/+e!8ation
A+ e do t'e e,)e!i*ent1 e o/+e!8ed *an0 t'in$+ To ca#cu#ate t'e
%!e=uenc0 o% t'e
o+ci##ation1 e need to )e!%o!* t'e %o!*u#a /0 ta"in$ t'e 8a#ue+
o% t'e L.1 C.
and C5 In t'e additiona# c'a##en$e1 i% 0ou c'an$e t'e 8a#ue o%
C.and C51 t'e $!a)' in t'e
o+ci##o+co)e and in t'e +)ect!u* ana#0?e! i+ di%%e!ent %!o* t'e
o!i$ina# e,)ected outco*e o%t'e ci!cuit Be o/+e!8ed t'at t'e 2FET
*u+t e,'i/it an a/+o#ute 8a#ue o% o)en ci!cuit 8o#ta$e
$ain $!eate! t'an o! e=ua# to t'e !atio C.@C5 in o!de! to
+u+tain o+ci##ation+
Be a#+o o/+e!8ed t'at t'e !ation o% t'e to ca)acito!+ +'ou#d /e
#e++ t'an t'at t'e8o#ta$e $ain to +u+tain t'e o+ci##ation
Conc#u+ion
Bit' t'i+ e,)e!i*ent1 e conc#ude t'at Co##)it+ o+ci##ato! i+
u+ed %o! 'i$'e!
%!e=uencie+1 t0)ica##0 /eteen . and ;77 MH? It i+ c'a!acte!i?ed
/0 t'e ca)aciti8e 8o#ta$e
di8ide! *ade u) o% C. and C5 T'i+ %eed/ac" 8o#ta$e i+ u+ed %o!
t'e o+ci##ation+ Co#)itt+o+ci##ato!+ can /e de+i$ned u+in$ 2T+1
FET+ o! 2FET+
T'e $!a)' o% t'e o+ci##ation de)end+ on t'e 8a#ue o% t'e to
ca)acito!+ %o! t'e+e
ca)acito!+ +e!8e+ a+ t'e 8o#ta$e di8ide! o% t'e ci!cuit
