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Update the formulas for Tee and Pi Attenuators 

This makes clear that we are utilizing the voltage attenuation formula while keeping the correct formulation as it is implemented in the code

Fixes https://gitlab.com/kicad/code/kicad/-/issues/12659
This commit is contained in:
Huanyin Liu 2022-10-19 15:49:09 +00:00 committed by Seth Hillbrand
parent e3842514e7
commit c64b4b8179
4 changed files with 8 additions and 4 deletions
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3
pcb_calculator/attenuators/pi_formula.h
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@ -4,7 +4,8 @@ _HKI( "### Pi Attenuator\n"
"___Z<sub>in</sub>___ is desired input impedance in &#x2126;<br>\n"
"___Z<sub>out</sub>___ is desired output impedance in &#x2126;<br>\n"
"\n"
"___L = 10<sup>a/20</sup>___<br>\n"
"___K = V<sub>I</sub>/V<sub>O</sub> = 10<sup>a/20</sup>___<br>\n"
"___L = K<sup>2</sup> = 10<sup>a/10</sup>___<br>\n"
"___A = (L+1) / (L&minus;1)___<br><br>\n"
"___R2 = (L&minus;1) / 2&middot;&radic;(Z<sub>in</sub> &middot; Z<sub>out</sub> / L)___<br>\n"
"___R1 = 1 / (A/Z<sub>in</sub> &minus; 1/R2)___<br>\n"

3
pcb_calculator/attenuators/pi_formula.md
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@ -3,7 +3,8 @@ ___a___ is attenuation in dB<br>
___Z<sub>in</sub>___ is desired input impedance in &#x2126;<br>
___Z<sub>out</sub>___ is desired output impedance in &#x2126;<br>
___L = 10<sup>a/20</sup>___<br>
___K = V<sub>I</sub>/V<sub>O</sub> = 10<sup>a/20</sup>___<br>
___L = K<sup>2</sup> = 10<sup>a/10</sup>___<br>
___A = (L+1) / (L&minus;1)___<br><br>
___R2 = (L&minus;1) / 2&middot;&radic;(Z<sub>in</sub> &middot; Z<sub>out</sub> / L)___<br>
___R1 = 1 / (A/Z<sub>in</sub> &minus; 1/R2)___<br>

3
pcb_calculator/attenuators/tee_formula.h
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@ -4,7 +4,8 @@ _HKI( "### Tee Attenuator\n"
"___Z<sub>in</sub>___ is desired input impedance in &#x2126;<br>\n"
"___Z<sub>out</sub>___ is desired output impedance in &#x2126;<br>\n"
"\n"
"___L = 10<sup>a/20</sup>___<br>\n"
"___K = V<sub>I</sub>/V<sub>O</sub> = 10<sup>a/20</sup>___<br>\n"
"___L = K<sup>2</sup> = 10<sup>a/10</sup>___<br>\n"
"___A = (L+1) / (L&minus;1)___<br><br>\n"
"___R2 = 2&middot;&radic;(L &middot; Z<sub>in</sub> &middot; Z<sub>out</sub>) / (L&minus;1)___<br>\n"
"___R1 = Z<sub>in</sub> &middot; A &minus; R2___<br>\n"

3
pcb_calculator/attenuators/tee_formula.md
View File

@ -3,7 +3,8 @@ ___a___ is attenuation in dB<br>
___Z<sub>in</sub>___ is desired input impedance in &#x2126;<br>
___Z<sub>out</sub>___ is desired output impedance in &#x2126;<br>
___L = 10<sup>a/20</sup>___<br>
___K = V<sub>I</sub>/V<sub>O</sub> = 10<sup>a/20</sup>___<br>
___L = K<sup>2</sup> = 10<sup>a/10</sup>___<br>
___A = (L+1) / (L&minus;1)___<br><br>
___R2 = 2&middot;&radic;(L &middot; Z<sub>in</sub> &middot; Z<sub>out</sub>) / (L&minus;1)___<br>
___R1 = Z<sub>in</sub> &middot; A &minus; R2___<br>