EDC Notes or ECAD (similar to Vakil sir Notes) Electronics , EXTC Branch. Engineering Group
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Transcript of EDC Notes or ECAD (similar to Vakil sir Notes) Electronics , EXTC Branch. Engineering Group
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FrequencY ResPonse xrcy range over which the amplifiel Tl be effectlvely
i"it" u"iawidth. To get more bandwidth' wg,usua|1
;ilJe J"o "uu"a
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as follows.; it"d"""d of the input signal' But' because of the coul
""p."itor" and junction
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a bn ampfifier'ts shown in Fi$'6'5' Here' the galn ls Plotl
rn O""rUa versus frequency of tnput slgnal ln log scale'
Gatn ln dectbel = zOlog(voA)
The frequency response shows the vartation of gatn of
.*jtifi"t *ittt i..qnbncy of tnput signal' Slnce the tn1&;;;;;"1""-*t "'Joutput
v-oltage 9lgd1.g?!",!Itiiit"tJit" maxlmum value (zo.togrrJz =-TB.T l9q
"ig".f amplitude iJkept constant' we ercpect the
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fr. "igtin"ance
of thls point rs tlat the output.power
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(v- \ ' . - v;*'''"'=[fr ),*"=frdB points,
' , - t2power =fryflR,=*
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t
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FtE.6.5FrequencY
(6.2) & (6.3) show that at 3dB points' power ls reduced by
' r f
bandwtdth=(f2-fJ(6.4)
f2 ls upPer halfof an amPlifier'
f, ls lower half powei frequency 'and
frequencY.
The characterlstlcs show that the response ls poor at of PowerArnPlifiersand very hlgh frequencies. The reduction in galn at
ge- output etage ln any 3S!u$er.:I:TT-.I :*pf#::
A?ffi-;:il".:n:il"t;;,F;" th" e11, i:*ll'-}llcifi$.*il'.t:;;t':l a1ll-o:^Yi-1-ol:f: *,T;'f$#::;';ffffi;ftffi'Jffi;;;;"q""ncreE l" 9": to th.ortl:,ffi; ;i;;u""' app;:gabre p.Yg-,1.-:le output devrces
"rr""Gg effec"ts of lunciion capacttance of the qlt"i"tot',i if,"n ,s roodspeaker. CRr, servomotor.s etc'
;fii;'::r"ffii".Jo'"1""."Jbx;;;tt* c"f""it ""*. 'lY;;;;;;;;
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frequen6tes is due tb ttre drop across lnput coupliig "tp^1"11:-11 ii:'frequencles rs due to the drop across lnut coupung canlcltoil ;f *u or;tput sta$9 ln any ann"u$e1 svstem ls a pgwer
(c") and output "orrpurrg "ip"cuor
tc"l. ir, "iaiu"orr,'at low,l,#*itlfier, irrg ippift;;-"td9 ffifitie tii. power ampllfler
frequencies, bypass capacuor c" cannoi"ri."u"av o*."ii9!{g9 rs a qa4-J "iff"r
r-ffit *hld Prptdsq sun-tcJgl.{
the ac signat to gror-J. t rs reSults -rn a-slnall :f4":-{l ;dia;;-l,;.1 t-o the i9*' dtt11et'.I11;1 Til*',]; ?i:,Ez
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