kicad/pcb_calculator/attenuators/bridget_tee_formula.html

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<p style="margin-bottom: 0cm"><font face="Times New Roman, serif"><font size="5" style="font-size: 18pt">Z<sub>in</sub>
desired input impedance in <b>&#8486;</b></font></font></p>
<p style="margin-bottom: 0cm"><font face="Times New Roman, serif"><font size="5" style="font-size: 18pt">Z<sub>out</sub>
desired output impedance <b>Z in = Z out</b></font></font></p>
<p style="margin-bottom: 0cm"><font face="Times New Roman, serif"><font size="5" style="font-size: 18pt"><i><b>a</b></i>
attenuation in dB</font></font></p>
<p style="margin-left: 1.25cm; margin-bottom: 0cm"><font face="Times New Roman, serif"><font size="5" style="font-size: 18pt"><b>L
= 10</b><sup><b>a/20</b></sup> (the loss)</font></font></p>
<p style="margin-bottom: 0cm"><br/>
</p>
<p style="margin-bottom: 0cm"><font face="Times New Roman, serif"><font size="5" style="font-size: 18pt"><b>Bridged
tee attenuator</b></font></font></p>
<p style="margin-left: 1.25cm; margin-bottom: 0cm"><font face="Times New Roman, serif"><font size="6" style="font-size: 24pt"><i><b>R1
= Z<sub>in</sub> * (L &minus; 1)</b></i></font></font></p>
<p style="margin-left: 1.25cm; margin-bottom: 0cm"><font face="Times New Roman, serif"><font size="6" style="font-size: 24pt"><i><b>R2
= Z<sub>in</sub>/(L &minus; 1)</b></i></font></font></p>
</body>
</html>