-----Original Message----- From: Magnus Danielson [mailto:[EMAIL PROTECTED] Sent: 28 June 2006 07:02 PM To: [email protected]; [EMAIL PROTECTED] Subject: Re: [time-nuts] Conditioning clock signal paths
From: <[EMAIL PROTECTED]> Subject: Re: [time-nuts] Conditioning clock signal paths Date: Wed, 28 Jun 2006 18:35:09 +0200 Message-ID: <[EMAIL PROTECTED]> >> Hi Magnus, >Hi Stephan, >> So I guess the verdict is that it is best to band limit your clock signal >> with a low-pass filter. This filter is then still supposed to still allow >> the necessary rise time for adequate PSSR. >That would only solve your problem partly, and also, as you pull your >filter >down in frequency you could actually worsen your situation as you lower the >slewrate as you cut away the overtones which contribute to a quick >transition. >No, what you have to do instead is to increase the slewrate gain. You >basically >want an amplifier to have sufficient linear gain around your trigger point >so >that the output of the amplifier is basically slew-rate limited. Any >incomming >noise will also be amplified, but as the slope is amplified the time- >stretch >they cover at the trigger point is much smaller and hence the noise-induced >trigger-jitter is reduced. Naturally, if you in the process add alot of >noise >you can spoil your result. Hi Magnus, Thank you for the excellent advice. From what I understood is this: the higher your slew rate the smaller the time epoch onto which you map the sum of your signal and the noise. This decreases the jitter in a proportional relationship to you slew rate. Am I missing the point completely? How does this relate to bandwidth limiting to reduce noise? (to me it seems it only applies to sinusoids then?). Best regards, Stephan. _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
