Hi, A possible explanation is that they use the term "high gain front end" when they assume a controlled noise bandwidth while for a comparator the assume an un-controlled noise bandwidth. The comparator has of coarse also a noise bandwidth that should be controlled by the designer.
Henk Op 17 apr. 2013, om 18:12 heeft "Bob Camp" <[email protected]> het volgende geschreven: > Hi > > I have no real idea how they distinguish their "high gain front end" from a > comparator. Judging from the way it was rattled off, I suspect there's a > patent application floating around somewhere. > > Bob > > -----Original Message----- > From: [email protected] [mailto:[email protected]] On > Behalf Of David > Sent: Wednesday, April 17, 2013 9:24 AM > To: Discussion of precise time and frequency measurement > Subject: Re: [time-nuts] LTC6957 Low Phase Noise Buffer/Driver > > On Wed, 17 Apr 2013 07:26:46 -0400, Bob Camp <[email protected]> wrote: > >> On Apr 16, 2013, at 9:51 PM, Richard (Rick) Karlquist > <[email protected]> wrote: >> >>> On 4/14/2013 7:48 AM, Brian Davis wrote: >>>> Not sure if it's already been mentioned, but Linear has introduced a new >>>> part that looks interesting : >>>> >>>> LTC6957 Low Phase Noise Buffer/Driver >>>> http://www.linear.com/product/LTC6957-1 >>> >>> This is VERY interesting, especially the low noise PECL output. I have >>> never seen any ECL device ever come close to that noise level. >>> It would be interesting to see how they did that. >>> >> >> The description from their tech guys is "Very high gain front end. It's a > saturating amp rather than a comparator." > > What criteria do they use to distinguish the two? Application? > Differential inputs and outputs? > > I am not surprised that it would have lower jitter than ECL if the > later lacks an independent external reference. > > I have been looking into low jitter triggers for sampling systems > recently and will probably end up using a discrete differential > amplifier driving ECL logic. > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
