[SI-LIST] Re: [SI-List]: Spread Spectrum Modulation Rate
- From: "Rob Oglesbee" <roglesbee@xxxxxxxxxxxxxxxxxx>
- To: "'SI-LIST'" <si-list@xxxxxxxxxxxxx>
- Date: Mon, 15 Dec 2014 08:27:21 -0500
Vinod,
The reason for ~30kHz is to get the modulation rate above audio band in case
it gets demodulated by an audio system. Higher modulation rates work well,
too, but the faster you go the more you have to worry about downstream PLLs
tracking it. 30-50kHz was a good compromise range.
Regards,
Rob Oglesbee
Radian Research
(765) 449-5505
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-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of vinod ah
Sent: Monday, December 15, 2014 6:04 AM
To: SI-LIST
Subject: [SI-LIST] [SI-List]: Spread Spectrum Modulation Rate
Hi All,
This query is with respect to Spread spectrum clocking/PLL design.
We see that modulation rate for Spread spectrum clocking will usually be
30KHz-33KHz.
Is there any legacy reason or design constraint or any other reason for
keeping the modulation rate at 33KHz instead of 10KHz or 100KHz etc..
Regards
Vinod A H
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