[time-nuts] LTC6957 Low Phase Noise Buffer/Driver

[Bob Camp]

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: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] 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 <lists at rtty.us> wrote:

>On Apr 16, 2013, at 9:51 PM, Richard (Rick) Karlquist
<richard at karlquist.com> 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.
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