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<div class=Section1>
<p class=MsoNormal><span class=SpellE><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'>Zdravim</span></font></span><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'>,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Ono to <span class=SpellE>neni</span> jen
o tom filtru.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Docela <span class=SpellE>nechutne</span>
se to <span class=SpellE>chova</span>, <span class=SpellE>kdyz</span> ten filtr
<span class=SpellE>budite</span> z <span class=SpellE>nekterych</span> bran
MCU, <span class=SpellE>ktere</span> <span class=SpellE>namaji</span> shodnou
velikost odporu <span class=SpellE>pri</span> sepnuti na Log.0 a Log.1.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Typicky v <span class=SpellE>pripade</span>
<span class=SpellE>vystupu</span> <span class=SpellE>otevreny</span> kolektor a
<span class=SpellE>nezalezi</span> na tom, ze je ten odpor v kolektoru na <span
class=SpellE>cipu</span>.<o:p></o:p></span></font></p>
<p class=MsoNormal><span class=SpellE><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'>Vysledekm</span></font></span><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'> je, ze RC konstanty se <span class=SpellE>lisi</span> <span
class=SpellE>pri</span> <span class=SpellE>nabijeni</span> a <span
class=SpellE>vybijeni</span> a <span class=SpellE>me</span> to <span
class=SpellE>delalo</span> <span class=SpellE>potize</span>,<o:p></o:p></span></font></p>
<p class=MsoNormal><span class=SpellE><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'>kdyz</span></font></span><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'> jsem <span class=SpellE>chtel</span> <span class=SpellE>dosahnout</span>
<span class=SpellE>vetsi</span> <span class=SpellE>presnosti</span>…<o:p></o:p></span></font></p>
<p class=MsoNormal><span class=SpellE><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'>Takze</span></font></span><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'> <span class=SpellE>neni</span> od <span class=SpellE>veci</span> si
zjistit zapojeni <span class=SpellE>tech</span> <span class=SpellE>vystupu</span>
v MCU a sehnat si <span class=SpellE>katalogove</span> <span class=SpellE>udaje</span>
o odporech v <span class=SpellE>jednotlivyh</span> stavech.<o:p></o:p></span></font></p>
<p class=MsoNormal><span class=SpellE><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'>Ja</span></font></span><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'> jsem to nakonec <span class=SpellE>resil</span> extra <span
class=SpellE>spinacem</span>(Maxim obvod) se <span class=SpellE>zarucenym</span>
odporem v obou <span class=SpellE>vystupnich</span> stavech…<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>A <span class=SpellE>az</span> teprve za
nim ten filtr…<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Ale na ten tu najdete <span class=SpellE>lepsi</span>
<span class=SpellE>odborniky</span>, <span class=SpellE>ja</span> jsem jej
navrhoval v <span class=SpellE>ElectronicWorkbench</span>, <span
class=SpellE>takze</span> jsem se <span class=SpellE>dival</span> co se tam <span
class=SpellE>deje</span>.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Mimo to, pokud nechcete <span
class=SpellE>vrazet</span> prachy za <span class=SpellE>kvalitni</span> <span
class=SpellE>vystupy</span>(Maxim), tak v <span class=SpellE>kteremsi</span>
<span class=SpellE>starem</span> AR/PE byl <span class=SpellE>clanek</span> s levnou
náhražkou s CMOS logikou a i ten filtr tam <span class=SpellE>jakysi</span>
byl <span class=SpellE>popsany</span>…<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<div>
<p class=MsoAutoSig><font size=3 color=navy face="Times New Roman"><span
lang=EN-US style='font-size:12.0pt;color:navy;mso-ansi-language:EN-US;
mso-no-proof:yes'>S pozdravem,<o:p></o:p></span></font></p>
<p class=MsoAutoSig><font size=3 color=navy face="Times New Roman"><span
lang=EN-US style='font-size:12.0pt;color:navy;mso-ansi-language:EN-US;
mso-no-proof:yes'><span style='mso-spacerun:yes'>
</span>Marek Pavlu<o:p></o:p></span></font></p>
</div>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<div style='border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm 4.0pt'>
<p class=MsoNormal><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma'>-----<span class=SpellE>Original</span> <span class=SpellE>Message</span>-----<br>
<b><span style='font-weight:bold'>From:</span></b>
hw-list-bounces@mailman.nethouse.cz
[mailto:hw-list-bounces@mailman.nethouse.cz] <b><span style='font-weight:bold'>On
Behalf Of </span></b>Novotný Pavel<br>
<b><span style='font-weight:bold'>Sent:</span></b> Friday, July 23, 2004 10:38
PM<br>
<b><span style='font-weight:bold'>To:</span></b> [HWnews]<br>
<b><span style='font-weight:bold'>Subject:</span></b> Poradite pri patku s PWM
, respektive s navrhem RC filtru?</span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<div>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Nam tu MCU, ktery umi PWM, pricemz PWM Clock=12.58MHz a
rozliseni je 16bitu, rad bych ho vyuzil jako Sigma Delta DAC , ale bohuzel
jsem spise programator a digitalni bastlir a tak si nevim rady s navrhem
lowpass filtru.</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Predpokladam, ze pri plnem 16bit rozliseni bude sirka pasma
192Hz a pri snizeni rozliseni na 12bitu cca 3kHz.</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Otazkou je jak by mel vypada RC clanek a jaky OZ dat za nej
pro rozliseni 16 respektive 12bitu. Pripadne zda bude pouziti RC filtru stacit
a nebude potreba pozit aktivni low-pass filtr a pokud ano tak jaky ?</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Uvitam kazdou radu a odkaz na literaturu,ktera mi umozni do
problematiky hloubeji proniknout.</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Dekuji</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>
J.Drexler</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
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