I've been following the discussion of the noise introduced by 74AC gates with
some interest.
In an attempt to achieve a clean transition, I've been using gates from
http://potatosemi.com/
Lacking the test equip. to verify the results, I've been taking the claimed
specs at face value.
I must
I wrote: “The input uses a LT1016 10ns comparator as the input stage
that drives several CD74AC00E quad nand gates” and got this response.
“This is a terrible design. The comparator will add considerable
jitter. What were they thinking? Rick Karlquist N6RK“
While my post was to show that
Hi
We do indeed make some assumptions when talking about frequency distribution.
If the need it to drive the standard input on a couple of conventional counters
and an economy class signal generator, that's one end of the output
spectrum.
If I want to use the signal to drive one side of a
Hi All,
I read Garry's email about using the 74AC04 as a distribution amplifier.
Did I read it right, does Gary say you will get -178 dBc/Hz at 10 kHz
offset???
Being one of only 3 or 4 companies in the world that manufactures
distribution amplifiers that break the -170 dBc/Hz region at 10
I picked up a used 10 Mhz distribution amplifier made by an English
company. The input uses a LT1016 10ns comparator as the input stage
that drives several CD74AC00E quad nand gates. The output from each
AC00 I.C. is fed through filters to recreate a pretty good sinewave.
From: Martyn Smith mar...@ptsyst.com
Subject: [time-nuts] Phase Noise of 74AC gates
I'm not about to say how we achieve -170 dBc/Hz phase noise, but we
definitely don't use op amps or logic gates!!
Regards
Martyn
Is this an advertisement? I don't think anybody believes a logic gate provides
Martyn Smith wrote:
Hi All,
I read Garry's email about using the 74AC04 as a distribution amplifier.
Did I read it right, does Gary say you will get -178 dBc/Hz at 10 kHz
offset???
Being one of only 3 or 4 companies in the world that manufactures
distribution amplifiers that break the -170
Bruce Griffiths wrote:
He's made similar comments before.
It actually isnt that difficult to achieve an isolation amplifier phase
noise floor below -170dBc/Hz if one is careful to use appropriate parts,
design techniques, and the input signal level is high enough.
The real problem is
Arthur Dent wrote:
I picked up a used 10 Mhz distribution amplifier made by an English
company. The input uses a LT1016 10ns comparator as the input stage
that drives several CD74AC00E quad nand gates. The output from each
AC00 I.C. is fed through filters to recreate a pretty good sinewave.
Rick Karlquist wrote:
Bruce Griffiths wrote:
He's made similar comments before.
It actually isnt that difficult to achieve an isolation amplifier phase
noise floor below -170dBc/Hz if one is careful to use appropriate parts,
design techniques, and the input signal level is high enough.
The
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