Crystals, and other things that tick

Ian Stirling (root@mauve.demon.co.uk)
Mon, 13 Jul 1998 05:22:47 +0100 (BST)


I suspect this may be a red herring, as the logical way to go is not
to swap a ceramic resonator for a crystal, but to add $.01 cost to the
chipset, and make it PLL to the 32Khz crystal, which has to be there
unless you want to lose the RTC altogether.

Also, another interesting development is oscillators for easing those
EMC woes. You have a oscillator that instead of sitting on one frequency
wanders up and down by around a percent every few hundred microseconds.
This has the effect of "spreading" the noise peaks, making a sharp
spike in the emission spectrum into a broad plateu(sp?, it's late) ,
substantially easing design.

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