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

[Henk ten Pierick]

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" <lists at rtty.us> 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: 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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