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kicad/pcb_calculator/attenuators/pi_formula.html

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kicad_curl.cpp: fix a compil warning on Windows (regression) pcb_calculator: fix incorrect formulas shown in attenuators panel. Png files are no more used, and formulas are now html doc files.
2016-01-16 14:27:42 +00:00
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=windows-1252"/>
<title></title>
<meta name="generator" content="LibreOffice 5.0.3.2 (Windows)"/>
<meta name="created" content="00:00:00"/>
<meta name="changed" content="2016-01-16T13:32:32.474000000"/>
<style type="text/css">
@page { margin: 2cm }
p { margin-bottom: 0.25cm; line-height: 120% }
a:link { so-language: zxx }
</style>
</head>
<body lang="fr-FR" dir="ltr">
<p style="margin-bottom: 0cm; font-style: normal; font-weight: normal; line-height: 100%">
<font face="Times New Roman, serif"><font size="6" style="font-size: 22pt"><b>Z</b><sub><b>in</b></sub>
desired input impedance in &#8486;</font></font></p>
<p style="margin-bottom: 0cm; font-style: normal; font-weight: normal; line-height: 100%">
<font face="Times New Roman, serif"><font size="6" style="font-size: 22pt"><b>Z</b><sub><b>out</b></sub><sub>
</sub> desired output impedance in &#8486;</font></font></p>
<p style="margin-bottom: 0cm; font-style: normal; font-weight: normal; line-height: 100%">
<font face="Times New Roman, serif"><font size="6" style="font-size: 22pt">a
attenuation in dB</font></font></p>
<p style="margin-bottom: 0cm; font-style: normal; font-weight: normal; line-height: 100%">
<font face="Times New Roman, serif"><font size="6" style="font-size: 22pt">L
= 10<sup>a/10</sup> (the loss)</font></font></p>
<p style="margin-bottom: 0cm; font-style: normal; font-weight: normal; line-height: 100%">
<font face="Times New Roman, serif"><font size="6" style="font-size: 22pt">A
= (L + 1)/(L &minus; 1)</font></font></p>
<p style="margin-bottom: 0cm; font-style: normal; font-weight: normal; line-height: 100%">
<br/>
</p>
<p style="margin-bottom: 0cm; font-style: normal; line-height: 100%"><font face="Times New Roman, serif"><font size="6" style="font-size: 28pt"><b>Pi
attenuator</b></font></font></p>
<p style="margin-bottom: 0cm; line-height: 100%"><font face="Times New Roman, serif"><font size="6" style="font-size: 28pt"><i><b>R2
= (L &minus; 1)/2 * &radic; ((Z<sub>in</sub> * Z<sub>out</sub>)/L)</b></i></font></font></p>
<p style="margin-bottom: 0cm; line-height: 100%"><font face="Times New Roman, serif"><font size="6" style="font-size: 28pt"><i><b>R1
= 1/( A/Z<sub>in</sub> &minus; 1/R2)</b></i></font></font></p>
<p style="margin-bottom: 0cm; line-height: 100%"><font face="Times New Roman, serif"><font size="6" style="font-size: 28pt"><i><b>R3
= 1/ (A/Z<sub>out</sub> &minus; 1/R2)</b></i></font></font></p>
</body>
</html>