RE: [SI-LIST] : Inductor Selection

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From: Ingraham, Andrew (Andrew.Ingraham@compaq.com)
Date: Wed Nov 08 2000 - 06:04:13 PST


> I have a question about inductor selection. I am designing a filter
> circuit to filter out noise from a power supply input to a PLL circuit. I
> want to filter out noise up to 1MHz. What should be the self resonance of
> such an inductor. The Q can be low, the application is broad band. Any
> help would be greatly appreciated.
 
PLLs often need very good rejection of low frequency supply noise. An LC
filter might have too high a cutoff frequency to be beneficial, and might
work better if a small resistor is substituted for (or put in series with)
the inductor.

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