Реферат: Фазовая автоподстройка частоты
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ecnfyjdbditqcz \ \ \ jib,rb \ \ \ ghb \ \ \ gjcnjzyyjv \ \ \ dytiytv
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djpltqcndbb^ yt ghtdsif.otv ytrjnjhjuj pyfxtybz&\,
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Eghfdktybt \ \ \ afpjq \ \ \ gjlcnhfbdftvjuj \ \ \ rjkt,fybz
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jceotcndkztncz c gjvjom. eghfdkz.otuj ecnhjqcndf \ (EE)-
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xfcnjnyjuj \ \ vjlekznjhf^ \ \ rjnjhsq \ \ bpvtyztn \ \ \ xfcnjne
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utythfwbb& Yf d[jl EE gjlftncz eghfdkz.ott \ yfghz;tybt
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\3U\!h \#^ \ rjnjhjt \ cdzpfyj \ c \ yfghz;tybtv \ \3U\!al \ \#lbaathty-\A
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wbfkmysv ehfdytybtv\,
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\^\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \3RC \*[---] \3+ U\!h \3= U\!al\3.\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \^\#(\32\#)\,
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\- \3dt
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\#Ghb 'njv vs cxbnftv^ \ xnj \ ltntrnjhyfz \ [fhfrnt-\A
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hbcnbrf AL zdkztncz aeyrwbtq dblf\,
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\^\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \3U\!al \#= \3S\!al\#*\9j\#(\9v\#)^\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \^(\33\#)\,
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ult \9j\#(\9v\#) — d j,otv ckexft ytkbytqyfz aeyrwbz \ hfpyjcnb
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afp d[jlyjuj cbuyfkf b cbuyfkf utnthjlbyf&\,
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Cxbnfz^ xnj \ htuekbhjdjxyfz \ [fhfrnthbcnbrf \ utnt-\A
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hjlbyf jgbcsdftncz ehfdytybtv\,
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\^\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \3f\!u \3= f\!uy \3- S\!u\3U\!h \3+ \)D\3f\!u\#^\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \^(\34\#)\,
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ult \ \)D\3f\!u \ \#- \ yfxfkmyfz \ hfccnhjqrf \ utnthjlbyf^ \ \ yfqltv
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htuekbhe.ott yfghz;tybt \3U\!h\3:\,
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\^\ \ \ \ \ \ \ \ \ \ \ \ \ U\!h \3= — \*[----]\3(\9w\!u \3- \9w\!uy \3- \)D\9w\!u\3)\#^\ \ \ \ \ \ \ \ \ \ \ \ \^(\35\#)\,
\- \32\9p\3S\!u
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\^\ \ \ \ \#ult \9w\!u \#= \*[---]\#& Njulf\ \ \*[---] \#= — \*[----][--\!2\*-]\#&\ \ \ \^(\36\#)\,
\- \3dt dt 2\9p\3S\!u \3dt
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\#Bp gjkextyyjuj \ cjjnyjitybz \ dblyj^ \ xnj \ afpjdsq
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ltntrnjh dshf,fnsdftn yfghz;tybt^ pfdbczott jn hfpyjcnb
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afp \9v\!u \#= \9v \#+ \9v\!c \#+ \9v\!g0 \#(\37\#)^ \ ult \ \9v\!g0 \ \#- \ \ afpf \ \ cbuyfkf
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jgjhyjuj utythfnjhf GX (cv& hbc& 1^,)&\,
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Lbaathtywbhez (\37\#)^ gjkexbv\3:\,
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\+ \!2 2
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\^\ \ \ \ \ \ \ \*[---] \#= \*[--] \#+ \9w\!c \#+ \9w\!g0\ \3;\ \*[--\!2\*-] \#= \*[--\!2\*-\#&\ \ \ \ \ \ \ \^(8)\,
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\#Bnfr^ cjgjcnfdkzz \ dshf;tybz \ (8) \ b \ (5)^ \ (6)^
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gjkexbv \ lbaathtywbfkmyjt \ ehfdytybt \ dnjhjuj \ \ gjhzlrf^
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jgbcsdf.ott hfpyjcnm afp \9v \#d cbcntvt AFGX\3:\,
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\^\ \ \ \ \ \ \ \3RC\*[--\!2\*- \3+ \*[--- \3+ 2\9p\3S\!al \3S\!u \9j\3(\9v\3) = \)D\9w\!u \3- \)D\9w\!c\ \ \ \ \ \ \^\#(9)\,
\- \3dt dt
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\#Htibnm \ gjkextyyjt \ ehfdytybt \ \ ljdjkmyj \ \ ckj;yj^
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gj'njve \ \ ghb \ \ vfks[ \ \ bpvtytybz[ \ \ \ xfcnjns^ \ \ \ rjulf
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cnfnbxtcrbt \ [fhfrnthbcnbrb \ EE \ b \ AL \ vj;yj \ cxbnfnm
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kbytqysvb^ \ [fhfrnthbcnbre \ \ htuekbhjdfybz \ \ (9) \ \ vj;yj
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ghtlcnfdbnm d dblt\3:\,
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\^\ \ \ \ \ \ \ \ \ \ \ \ \ \ \*[--] \#= \)D\9w\!yfx \#- 2\9p\3K\!afgx \9j\#(\9v\#)^\ \ \ \ \ \ \ \ \ \ \ \ \^(\31\#0)\,
\- \3dt
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\#ult \3K\!afgx \3= S\!al \3S\!u \3; \9w\!yfx \3= \)D\9w\!u \3- \)D\9w\!c\#&\,
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Dshf;tybt \ (\31\#0) \ yt \ exbnsdftn \ yfkbxbt \ abkmnhf^
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n&t& cxbnftncz^ xnj \3RC \#= 0& \ Afpjdsq \ gjhnhtn \ cbcntvs
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AFGX - uhfabr pfdbcbvjcnb \3d\9v\#/\3dt \#jn \9v \#ghb \ hfpkbxys[
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yfxfkmys[ hfccnhjqrf[ \)D\9w\!yfx \#- gjrfpfy yf hbc& 2&\,
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\^\ \ \ \ \ \ \ \ \ \#Hbc& 2& Afpjdsq gjhnhtn cbcntvs AFGX\ \ \ \ \ \ \ \ \ \^\,
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\12.2. \#Gjkjcf elth;fybz b gjkjcf dnzubdfybz cbcnt-\A
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vs AFGX&\,
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Bp hbc& 2& dblyj^ xnj d \ cnfwbjyfhyjv \ cjcnjzybb
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( rjulf \3d\9v\#/\3dt \#= 0 ) hfdyjdtcbt djpvj;yj njkmrj \ d \ njv
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ckexft^ rjulf rhbdfz \ \3d\9v\#/\3dt \ \#gthtctrftn \ jcm \ f,cwbcc&
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Vfrcbvfkmyjt pyfxtybt yfxfkmyjq hfccnhjqrb^ ghb rjnjhjq
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cbcntvf \ \ AFGX \ \ cgjcj,yf \ \ dsgjkyznm \ \ cdjb \ \ aeyrwbb^
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jghtltkztncz gjkjcjq \ elth;fybz \ \)D\9w\!el\#& \ Ghb \ ljcnfnjxyj
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cbkmyjv cbuyfkt yf \ d[jlt \ cbcntvs^ \ gjkjcf \ elth;fybz
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jghtltkztncz \ \ \ vfrcbvfkmysv \ \ \ pyfxtybtv \ \ \ htuekbhe.otuj
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yfghz;tybz^ \ f \ cktljdfntkmyj^ \ vfrcbvfkmysv \ \ pyfxtybtv
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\3U\!al\#^ rjnjhjt cjjndtncndetn pyfxtybzv eukf \,
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\^\ \ \ \ \ \ \ \ \9v \ \#= \ \33\#/2\9p \ — \#2\9p\3n \#^ ult \3n \#= 0^ \31\#^ &&& &\ \ \ \ \ \ \ \ \^\,
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D 'njv ckexft gjkjcf elth;fybz hfdyf\,
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\^\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \)D\9w\!yfx \9= \#2\9p\3K\!afgx\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \^\#(\311\#)\,
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Ghjwtcc dnzubdfybz d ht;bv elth;fybz jghtltkztncz
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gjkjcjq \ dnzubdfybz^ \ rjnjhfz \ ghb \ jncencndbb \ abkmnhf
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hfdyf gjkjct elth;fybz& Ghb yfkbxbb abkmnhf \ \)D\9w\!D\3<\)D\9w\!el\#&
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Gjkjce \ \ dnzubdfybz \ \ j,sxyj \ \ ds,bhf.n \ \ nfr^ \ \ \ xnj,s
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dsgjkyzkjcm eckjdbt \,
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\^\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \)D\9w\!d\3>\#2\)D\9w\!yfx\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \^\#(\31\#2)
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Lkz \ \ \ edtkbxtybz \ \ \ gjkjcs \ \ \ \ dnzubdfybz \ \ \ \ ghbvtyz.n
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rjhhtrnbhe.obt abkmnhs&\,
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Rfr ,skj \ crfpfyj \ hfytt^ \ cbcntvf \ AFGX \ dyjcbn
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jib,re htuekbhjdfybz gj afpt\,
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\^\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \)D\9v\!ecn \#= \9v\!ecn \#- \33\#/2\9p\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \^\#(\31\#3)\,
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Ghb \ \ ljcnb;tybb \ \ yfxfkmyjq \ \ hfccnhjqrb \ \ uhfybw
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j,kfcnb \ dnzubdfybz^ \ gjkexftncz \ vfrcbvfkmyjt \ pyfxtybt
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jib,rb \)D\9v\!ecn vf[ \#= \9+ p\#/2\,
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\12.3. \#Ecnjqxbdjcnm cbcntvs AFGX&\,
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Ecnjqxbdjcnm \ AFGX \ ljcnbuftncz \ \ ghb \ \ dsgjkytybb
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ythfdtycndf \3K\!afgx \3< \#0& \ Lkz \ dsgjkytybz \ 'njuj \ eckjdbz
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pyfrb \ rhenbpys \ cnfnbxtcrb[ \ [fhfrnthbcnbr \ AL \ b \ EE
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ljk;ys ,snm ghjnbdjgjkj;ysvb& \ {fhfrnthyjq \ jcj,tyyjcnm.
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cbcntvs \ AFGX \ zdkztncz \ nj^ \ xnj \ erfpfyyjt \ \ eckjdbt
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dsgjkybvj ytpfdbcbvj \ jn \ bc[jlyjuj \ cjcnjzybbz \ pyfrjd
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rhenbpys& \ «nj \ j,eckjdktyj \ gthbjlbxyjcnm. \ cnfnbxtcrjq
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[fhfrnthbcnbrb AL \ b \ tt \ cbvvtnhbxyjcnm. \ jnyjcbntkmyj
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jcb jhlbyfn&\,
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Jlyfrj tckb \ d \ cbcntvt \ cjlth;fncz \ eprjgjkjcyst
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abkmnhs^ \ dyjczobt \ pyfxbntkmyjt \ pfgfplsdfybt \ cbuyfkf^
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cbcntvf \ \ AFGX \ \ \ vj;tn \ \ \ ,snm \ \ \ ytecnjqxbdjq& \ \ \ Ghb
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bcgjkmpjdfybb jlyjpdtyyjuj \3RC \#- \ abkmnhf^ \ cbcntvf \ AFGX
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dctulf ecnjqxbdf^ yj ghjwtcc ecnfyjdktybz vj;tn yjcbnm
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rjkt,fntkmysq [fhfrnth ghb ,jkmijv pyfxtybb \ gjcnjzyyjq
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dhtvtyb abkmnhf&\,
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\^\ \ \ \ \ \ \ \ \13. \#Rjv,bybhjdfyyfz cbcntvf AFGX — XFGX&\ \ \ \ \ \ \ \ \^\,
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Hfytt ,skj gjrfpfyj^ xnj cbcntvs \ AFGX \ j,kflf.n
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eprjq \ gjkjcjq \ dnzubdfybz^ \ pfdbczoe. \ jn \ \ gjcnjzyyjq
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dhtvtyb abkmnhf& D nj ;t \ dhtvz \ XFGX \ kbityf \ 'njuj
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продолжение
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