RE: Clock Dithering - some more information

I found the report Jack refers to on the website, and I think it is well worth reading. Regards - Chris Chileshe - Ultronics Ltd -Original Message- From: Jacob Schanker [SMTP:j.schan...@worldnet.att.net] Sent: Thursday, June 21, 2001 8:39 PM To: emc-p...@ieee.org Subject:

Re: Clock dithering

tkrepdavsml7e...@jmwa.demon.co.uk, John Woodgate j...@jmwa.demon.co.uk inimitably wrote: 4.3.2.7.2.20010618143751.00b3d...@box.tin.it, Paolo Roncone paolo...@tin.it inimitably wrote: As for interference to broadband receivers (like TV equipment) I remember a Lexmark study published a few years

Re: Clock dithering

200106182001.qaa14...@interlock2.lexmark.com, rogle...@lexmark.com inimitably wrote: According to our extensive tests in conjunction with Philips Consumer Electronics, digital TV (both COFDM and ATSC) is actually less susceptible to interference from spread spectrum clocks (ssc) than current

Re: Clock dithering

4.3.2.7.2.20010618143751.00b3d...@box.tin.it, Paolo Roncone paolo...@tin.it inimitably wrote: As for interference to broadband receivers (like TV equipment) I remember a Lexmark study published a few years ago that showed no increased interference from modulated clocks vs unmodulated clocks

Re: Clock dithering

According to our extensive tests in conjunction with Philips Consumer Electronics, digital TV (both COFDM and ATSC) is actually less susceptible to interference from spread spectrum clocks (ssc) than current analog TV (both PAL and NTSC). Philips has stated in a letter to us that they do not

Re: Clock dithering

Hi Cyril, I have a very good (EMC-wise) experience with clock dithering. I started using the Spread Spectrum Clock Generation (SSCG) technique (patented by Lexmark) in 1995 when I worked for my previous company. We made printers and one of our main customers was IBM. They pushed us to use an

Re: Clock dithering

Hi Cyril, I have a very good (EMC-wise) experience with clock dithering. I started using the Spread Spectrum Clock Generation (SSCG) technique (patented by Lexmark) in 1995 when I worked for my previous company. We made printers and one of our main customers was IBM. They pushed us to use an

RE: Clock dithering

Hi Cyril, Have you tried reducing the current that comes out of the clock oscillator with a series-resistor ? ( a small ferrite may help also). Are you sure the clock line does only route on earth-plane covered areas on the board ? To determine if the harmonic comes from clock or other signals

RE: Clock Dithering

Be careful. IBM (perhaps Lexmark now) holds a patent on certain aspects of this technology. Richard Woods -- From: Binnom, Cyril A [SMTP:binno...@ems-t.com] Sent: Friday, June 15, 2001 10:07 AM To: emc-pstc Cc: McBride, James; Wismer, Sam;