%%?Demo:?Phase?Locked?Loop
%?This?demo?shows?the?executable?specifications?and?design?with?simulation
%?capabilities?of?Simulink.?It?highlights:
%??
%?1.?Creating?conceptual?models?of?signal?processing?systems?and?running
%?simulations
%
%?2.?Adding?finite?state?machines?to?the?design
%
%?3.?Creating?models?of?physical?components?（e.g.?circuitery）
%
%?4.?Using?discrete-time?signal?to?create?mixed-signal?models
%
%?5.?Converting?digital?models?to?fixed-point
%
%?6.?Optional:?（not?implemented?yet）?generating?C?and/or?HDL

%%?What?is?a?Phase-Locked?Loop?
%?A?phase-locked?loop?（PLL）?is?a?closed-loop?feedback?control?system?that
%?generates?and?outputs?a?signal?in?relation?to?the?frequency?and?phase?of
%?an?input?（“reference“）?signal.?A?phase-locked?loop?circuit?responds?to
%?both?the?frequency?and?the?phase?of?the?input?signals?automatically
%?raising?or?lowering?the?frequency?of?a?controlled?oscillator?until?it?is
%?matched?to?the?reference?in?both?frequency?and?phase.
%?
%?This?type?of?mechanism?is?widely?used?in?radio?telecommunications
%?computers?and?other?electronic?applications?where?it?is?desired?to
%?stabilize?a?generated?signal?or?to?detect?signals?in?the?presence?of
%?noise.?Since?an?integrated?circuit?can?hold?a?complete?phase-locked?loop
%?building?block?the?technique?is?widely?used?in?modern?electronic
%?devices?with?signal?frequencies?from?a?fraction?of?a?cycle?per?second?up
%?to?many?gigahertz.??（Source:?wikipedia.org.）


%%?A?linear?Phase?Locked?Loop?in?Simulink
%?The?first?step?of?the?demo?shows?how?to?model?and?simulate?a?linear?PLL
%?that?can?track?a?1?MHz?reference?signal.
%
%?A?classic?or?linear?PLL?uses?a?mixer?as?a?phase?detector.?This?yields?a
%?DC?component?that?is?proportional?（but?not?linear）?with?the?phase
%?difference?and?a?component?at?a?frequency?that?is?twice?the?input
%?frequency.?A?loop?filter?is?used?to?get?rid?of?the?second?component.?The
%?output?of?the?loop?filter?is?fed?into?a?VCO?that?increases?the?freqeuncy
%?if?there?is?a?positive?phase?difference?and?that?decreases?the?frequency
%?if?there?is?a?negative?phase?difference.
%
%?Start?with?the?basic?components?of?a?PLL:?a?Multiply?block?（Math
%?Library）?an?Analog?Filter?Design?block?（Filter?Design?library?in?the
%?Signal?Processing?Blockset）?and?a?Voltage?Controlled?Oscillator
%?（Communications?Blockset?Components?sublibrary?in?the?Synchronization
%?library）.
%
%?Double?click?on?the?blocks?to?show?how?to?set?the?parameters?for?each
%?block:
%
%?The?Analog?Filter?Design?block;
%????Design?method:?butterworth
%????Filter?type:?Lowpass
%????Filter?order:?5
%????Passband?edge?frequency:?1e6*2*pi.
%
%?The?VCO?block;
%????Quiescent?frequency:?1e6
%????Input?sensitivity:?1e5
%????Initial?phase:?0.

open_system（‘linearpll‘）;?set_param（bdroot‘SimulationCommand‘?‘update‘）
sim（bdroot）;

%%
%?In?order?to?simulate?the?system?we?need?a?test?input?and?vizualiation.
%?To?achieve?this?add?a?S

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2012-11-16?13:01??Phase?Locked?Loo\
?????目錄???????????0??2012-11-16?13:15??Phase?Locked?Loo\Images\
?????文件???????37898??2007-04-20?00:30??Phase?Locked?Loo\cppll.mdl
?????文件???????45910??2007-05-04?21:44??Phase?Locked?Loo\dpll.mdl
?????文件???????46721??2007-04-20?05:04??Phase?Locked?Loo\dpll_fixpt.mdl
?????目錄???????????0??2012-11-16?11:43??Phase?Locked?Loo\html\
?????文件???????43520??2012-11-16?11:38??Phase?Locked?Loo\html\Thumbs.db
?????文件??????238484??2007-05-04?21:59??Phase?Locked?Loo\html\fixpttool.jpg
?????文件???????14387??2007-04-20?00:17??Phase?Locked?Loo\html\pfd.jpg
?????文件???????38042??2007-05-04?21:56??Phase?Locked?Loo\html\plldemo.html
?????文件????????4347??2007-05-04?21:56??Phase?Locked?Loo\html\plldemo.png
?????文件????????9728??2007-05-04?21:55??Phase?Locked?Loo\html\plldemo_01.png
?????文件????????6033??2007-05-04?21:55??Phase?Locked?Loo\html\plldemo_02.png
?????文件????????5134??2007-05-04?21:55??Phase?Locked?Loo\html\plldemo_03.png
?????文件????????8169??2007-05-04?21:55??Phase?Locked?Loo\html\plldemo_04.png
?????文件????????8519??2007-05-04?21:55??Phase?Locked?Loo\html\plldemo_05.png
?????文件???????14397??2007-05-04?21:55??Phase?Locked?Loo\html\plldemo_06.png
?????文件???????10221??2007-05-04?21:55??Phase?Locked?Loo\html\plldemo_07.png
?????文件????????8674??2007-05-04?21:56??Phase?Locked?Loo\html\plldemo_08.png
?????文件????????5169??2007-05-04?21:56??Phase?Locked?Loo\html\plldemo_09.png
?????文件????????9645??2007-05-04?21:56??Phase?Locked?Loo\html\plldemo_10.png
?????文件????????6896??2007-05-04?21:56??Phase?Locked?Loo\html\plldemo_11.png
?????文件????????5358??2007-05-04?04:26??Phase?Locked?Loo\html\plldemo_eq79689.png
?????文件????????1551??2009-06-19?14:47??Phase?Locked?Loo\license.txt
?????文件???????29832??2012-11-16?13:01??Phase?Locked?Loo\linearpll.mdl
?????文件???????16037??2007-05-04?21:50??Phase?Locked?Loo\plldemo.m
?????文件???????47261??2007-04-27?01:08??Phase?Locked?Loo\powerpll.mdl