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Inductor Self-Resonance Frequency: What's high enough? Inductor Self-Resonance Frequency: What's high enough?
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Old 19th June 2008, 05:29 AM   (permalink)
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Originally Posted by Mikebits View Post
How many air wound coils do you see in a PCS cell phone?
Exactly! I mean, forgive me for keeping up with the times--but I was told SMT was a proven technology. Cellular's got em. WiFi's got em. Bluetooth? You'd better believe it. "Wind an air core?" No thanks.
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Last edited by DigiTan; 19th June 2008 at 05:29 AM.
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Old 19th June 2008, 08:38 AM   (permalink)
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Exactly! I mean, forgive me for keeping up with the times--but I was told SMT was a proven technology. Cellular's got em. WiFi's got em. Bluetooth? You'd better believe it. "Wind an air core?" No thanks.
You need to consider the frequencies involved, at those frequencies you don't use coils at all, just etched PCB tracks - try reading about 'lecher lines' and such.
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Old 19th June 2008, 11:03 PM   (permalink)
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At only 180 MHz, I would use SMT inductors up to a hundred milliwatts or so. Just be sure to consider the current rating.
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