In message <[EMAIL PROTECTED]>, Ian
Wilson <[EMAIL PROTECTED]> writes
>Though I would hazard a guess that you are operating at higher freqs than
>the original poster. They mentioned FM, assuming normal FM bands, I would
>assume printed inductors get unreasonably large, and discrete have
>reasonable size, Q, SRF etc at the 88-108 MHz band these days. (Not that
>one would want high Q for supply/ground coupling anyway and would usually
>deliberately degrade Q to prevent noise peaking.)
>
>Or do you find that you do get useful inductance from printed inductors at
>100MHz-odd freqs? What sort of inductance can be achieved in reasonable
>space using printed inductors and standard line/spacing of say 8/8 or 6/6?
>
>Ian
Ian,
One calculator I have here suggests that for a square spiral 10mm
across, 5 turns, no ground plane you should get an inductance of around
120nH and some 10% lower with a ground plane.
I have not verified this on the simulator (but can if you have something
specific in mind)
--
David Want
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