asymmetric stripline





Given a pc board like...





======================================= ground
^
12 mils
v
======= trace ----------

^
24 mils
v


======================================= ground




and assuming FR-4 and 1 oz copper, does anybody know what trace width
gives 50 ohms? My rough guess is 12 mils.

googling online calculators yields an impressive collection of
defunct/missing/silly web pages. I suppose I could fire up ATLC, but
that's a heap of work.

Help appreciated.


John

.



Relevant Pages

  • Re: buried trace impedance
    ... L1 traces are simple microstrip, 20 mils above the plane, so something ... like Appcad gives the trace impedances, about 87 ohms for a 10 mil ... the impedance would be 66.5 ohms. ...
    (sci.electronics.design)
  • Re: buried trace impedance
    ... L1 traces are simple microstrip, 20 mils above the plane, so something ... like Appcad gives the trace impedances, about 87 ohms for a 10 mil ... the impedance would be 66.5 ohms. ...
    (sci.electronics.design)
  • Re: buried trace impedance
    ... L1 traces are simple microstrip, 20 mils above the plane, so something ... like Appcad gives the trace impedances, about 87 ohms for a 10 mil ... the impedance would be 66.5 ohms. ...
    (sci.electronics.design)
  • Re: buried trace impedance
    ... L1 traces are simple microstrip, 20 mils above the plane, so something ... like Appcad gives the trace impedances, about 87 ohms for a 10 mil ... the impedance would be 66.5 ohms. ...
    (sci.electronics.design)
  • Re: buried trace impedance
    ... L1 traces are simple microstrip, 20 mils above the plane, so something ... like Appcad gives the trace impedances, about 87 ohms for a 10 mil ... the impedance would be 66.5 ohms. ...
    (sci.electronics.design)