[SI-LIST] Re: Spread Spectrum Clock Synthesizers
- From: "Chris McGrath" <chris.mcgrath@xxxxxxxx>
- To: <Shiraz.Bashir@xxxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Mon, 3 May 2004 06:16:05 -0700
Processors that require an external clock to feed an internal PLL will
have specific limits to spread spectrum input clock parameters
(modulation range, % spread) and they should be stated in the processor
designer's guide since the requirements are processor dependent. Any
PLL input with a tight jitter specification will likely prohibit use of
spread spectrum clocking.
-Chris
> -----Original Message-----
> From: Bashir, Shiraz (MED) [mailto:Shiraz.Bashir@xxxxxxxxxx]=20
> Sent: Friday, April 30, 2004 6:40 PM
> To: 'si-list@xxxxxxxxxxxxx'
> Subject: [SI-LIST] Spread Spectrum Clock Synthesizers
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> HI,
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> Does any body has experience in using Spread Spectrum Clock=20
> Synthesizers/ Driver (similar to CY2287).=20
> http://eent3.sbu.ac.uk/units/ade/warpdocs/CDrom/CDROM/DOCS/PRO
> DUCT/CLOCK/CY2
> 287.PDF
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> My question is what happens when a PLL (CY2287) output is fed=20
> into another PLL (inside Motorola MPC8270ZU microprocessor) ?
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> Spread Spectrum Clock Synthesizers manufacturer claim that=20
> they reduce EMI as compared to non-modulated parts.
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> Also what specifications should I look at while selecting a=20
> Spread Spectrum Clock Synthesizer to meet my system=20
> requirement (i.e., MPC8270ZU).
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> Thanks,
> shiraz
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> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx=20
> [mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of mahamud khandokar
> Sent: Friday, April 30, 2004 3:42 PM
> To: si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] Ansoft Nexxim? versus Hspice
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> Dear All,
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> =20
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> can anyone tell me which one is the best for simulation:=20
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> =20
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> Ansoft Nexxim(tm) or Hspice
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> =20
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> please tell me something positive/negetive ,if anyone used=20
> this new software before.
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> I need to buy one of them for my company. we are PCB design=20
> based company.
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> =20
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> Thanks.
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> =20
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> Misty
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> =20
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> =09
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