Documentation

« Calculateur d'impédance » : différence entre les versions

Page créée avec « In high frequency PCB designs the impedance of a signal leading medium needs to be recognized. So it is convenient to determine the later width of a track in the layout al... »
 
Aucun résumé des modifications
Ligne 1 : Ligne 1 :
In high frequency PCB designs the impedance of a signal leading medium needs to be recognized. So it is convenient to determine the later width of a track in the layout already in the schematic. This should be possible for single signals or for signal classes as well. It is about the principle of how a StripLine should be constructed. [http://en.wikipedia.org/wiki/Stripline StripLine].<br><br>
Dans un dessin de PCB à haute fréquence l'impédance d'un moyen conductif  de signal doit être reconnue.
Donc, il est récommendable de déterminer la largeur d'une piste de PCB déjà dans le schéma. Cela devrait être possible pour les signaux singles ou pour les classes de signaux ainsi. Il s'agit du principe de la façon dont un StripLine doit être construit. [http://en.wikipedia.org/wiki/Stripline StripLine].<br><br>


[[Image:stripline.png|StripLine (Cross section)]]<br>Image: StripLine (Cross section). The StripLine is the copper in the center.<br><br>
[[Image:stripline.png|StripLine (section)]]<br>Image: StripLine (section). Le StripLine est le cuivre au centre.<br><br>


Open in TARGET 3001! the impedance calculator either in the dialog ''Change signal wires'' (Double click on a signal wire or press [e] after having highlighted the signal) or in the dialog ''Edit signal classes'' (menu Actions).<br><br>
Ouvrez en TARGET 3001! le calculateur d'impédance soit dans la boîte de dialogue: ''Change signal wires'' (Double clic sur un signal ou poussez [c] pour <u>c</u>hanger aprés marquage) ou dans la dialogue ''Edit signal classes'' (menu Actions).<br><br>
<table cellpadding="20" border="0">
<table cellpadding="20" border="0">
<tr>
<tr>
<td>[[image:impedanzkalkulator1_e.png|300px|The dialog "Change signal wires"]]<br>Image: The dialog: "Change signal wires"</td>
<td>[[image:impedanzkalkulator1_f.png|300px|The dialog "Change signal wires"]]<br>Image: The dialog: "Change signal wires"</td>
<td>[[image:impedanzkalkulator2_e.png|300px|The dialog "Edit signal classes"]]<br>Image: The dialog: "Edit signal classes"</td>
<td>[[image:impedanzkalkulator2_f.png|300px|The dialog "Edit signal classes"]]<br>Image: The dialog: "Edit signal classes"</td>
</tr>
</tr>
</table><br>
</table><br>
Ligne 18 : Ligne 19 :
If the StripLine is placed double (differential StripLine), the distance '''s''' between both tracks plays an additional role. The required spacing between the tracks is calculated and overtaken to the signal class definitions as well.
If the StripLine is placed double (differential StripLine), the distance '''s''' between both tracks plays an additional role. The required spacing between the tracks is calculated and overtaken to the signal class definitions as well.


[[Image:stripline_e.png|The Impedance calculator]]<br>Image: The Impedance calculator suggests the best track width and overtakes the value to a signal or a signal class.<br><br><br><br>
[[Image:stripline_f.png|The Impedance calculator]]<br>Image: The Impedance calculator suggests the best track width and overtakes the value to a signal or a signal class.<br><br><br><br>






[[en:Impedance calculator]][[de:Impedanz-Kalkulator]][[fr:Calculateur d'impédance]]
[[en:Impedance calculator]][[de:Impedanz-Kalkulator]][[fr:Calculateur d'impédance]]

Version du 4 juin 2014 à 12:57

Dans un dessin de PCB à haute fréquence l'impédance d'un moyen conductif de signal doit être reconnue. Donc, il est récommendable de déterminer la largeur d'une piste de PCB déjà dans le schéma. Cela devrait être possible pour les signaux singles ou pour les classes de signaux ainsi. Il s'agit du principe de la façon dont un StripLine doit être construit. StripLine.

StripLine (section)
Image: StripLine (section). Le StripLine est le cuivre au centre.

Ouvrez en TARGET 3001! le calculateur d'impédance soit dans la boîte de dialogue: Change signal wires (Double clic sur un signal ou poussez [c] pour changer aprés marquage) ou dans la dialogue Edit signal classes (menu Actions).

The dialog "Change signal wires"
Image: The dialog: "Change signal wires"
The dialog "Edit signal classes"
Image: The dialog: "Edit signal classes"


The following terms are of interest:

  • The hugeness (height) h of the dielectric agens the StripLine is embedded to (= the body of the PCB)
  • The copper thickness t of the StripLine
  • The permittivity εr of the dielectric agens

A certain Nominal impedance Z required, needs the required track width w according to the the facts given. This track width can be overtaken to the signal or the signal class as standard width.

If the StripLine is placed double (differential StripLine), the distance s between both tracks plays an additional role. The required spacing between the tracks is calculated and overtaken to the signal class definitions as well.

The Impedance calculator
Image: The Impedance calculator suggests the best track width and overtakes the value to a signal or a signal class.



fr:Calculateur d'impédance