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I advice u u read a bit this document. With protel only, it might be hard...
And I heard that this "method" need several prototypes and component implementaton can cause difference as well.
Like I've seen something on the inet : **broken link removed**
I really doubts about efficience of a pcb coil at any VHF frequency... I would like to hear if some guys here already used this technique in a real project. Were the results as expected, incoherance from simulation to real prototype and things like that
Some time ago I was searching solution for same problem and I found very old program from Agilent called APPCAD. It contains tool for spiral coils design. Surprisingly 3-pole filter with coils designed by this program works better than expected, on first try and no addidtional tunning needed. Try search for this program in forum, I think I seen it somewhere, but it must be old DOS version.
Some time ago I was searching solution for same problem and I found very old program from @gilent called APPCAD. It contains tool for spiral coils design. Surprisingly 3-pole filter with coils designed by this program works better than expected, on first try and no addidtional tunning needed. Try search for this program in forum, I think I seen it somewhere, but it must be old DOS version.
Of course the frequency will change. The inductance of the PWB inductor is affected by nearby metallic objects. At first it seems nice to use printed inductors, but the properties of the circuit board changes with batches (material, process variations). FR-4 material is not the best for RF if reasonably high Q-values is needed. Then it is also quite difficult to tune a resonance circuit if the inductance needs to be changed. Furthermore, a chip type inductor is indeed smaller.
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