Method and circuit to reduce Jitter?

[Simon]

Hi,

I am an electrical engineering student and I am interested in circuit
design. Unfortunety I am not so familiar with analog design. Therefore I
want to place my question here in the newsgroup:

Is there a method to reduce jitter without the use of PLL? Where can I find
sophisticated circuits for this?

Any help, hints and comments are highly appreciated.

Greetings Simon

 

[PeteS]

Hi,

I am an electrical engineering student and I am interested in circuit
design. Unfortunety I am not so familiar with analog design. Therefore I
want to place my question here in the newsgroup:

Is there a method to reduce jitter without the use of PLL? Where can I find
sophisticated circuits for this?

Any help, hints and comments are highly appreciated.

Greetings Simon

Before trying to give specific advice, I'll point you at a decent
introduction to the subject:

http://www.highfrequencyelectronics.com/Archives/Apr04/HFE0404_Hancock.pdf

After that, we'd need a lot more information - PLLs have jitter that is
often worse than the driving input for instance, so they are not a
panacea.

Cheers

PeteS

 

[Jim Thompson]

Reduce jitter of what?

John

pre-exam ?

...Jim Thompson

 

[Don Bowey]

Hi,

I am an electrical engineering student and I am interested in circuit
design. Unfortunety I am not so familiar with analog design. Therefore I
want to place my question here in the newsgroup:

You should have begun with Google.

Is there a method to reduce jitter without the use of PLL? Where can I find
sophisticated circuits for this?

Yes. Google.

Any help, hints and comments are highly appreciated.

Greetings Simon

1. Search Google.

2. Pay some attention to the feedback filter.

Don

 

[Richard Henry]

I used to actually enjoy Exam Week. About an hour before each test,
I'd sit under an oak tree, skim the textbook, take the test, and then
I'd have the rest of the day off. If I was in a playful mood, I'd
finish the test in a half hour and leave, which would freak everybody
else out and boost me on the curve. Having done electronics since I
was a kid, I knew what was important. To most of the other guys, all
this was a maze of equations without a lot of real meaning... I was
the *only* electronics hobbyist in my EE class. I took one electrical
machinery class, with an especially ornery instructor, where class
average on quizzes was 15%, so my 50% was an A.

He'd lecture:

"OK, will this motor rotate clockwise or counterclockwise? Show of
hands? OK, next subject..."

My first college room-mate was a mechanical engineering major. As
such, he was required to take a Freshman course titled "Engineering
Graphics", which had been taught by the same ancient professor for
decades. The professor allowed students to bring any materials they
wished to the final exam. So, of course, the engineering fraternity
sold a bound volume of all the problems ever given in the EG finals,
complete with worked out solutions.

There were some humorous twists: some of the solution sheets included
lines included like "Drop your pencil and pick it up", Lean back and
stretch" or "Smile and wave to the proctor". Of course, you were
supposed to perform those acts, not copy them blindly into the test
papers.

 

[Rich Grise, Plainclothes Hippie]

LOL,

Wonder if any clueless student ever did copy them blindly. The prof
probably wondered, "What the h__??"

I wonder what the profs thought when a whole classful of students would
drop their pencils, or stretch, or smile and wave, simultaneously. ;-)

Cheers!
Rich

 

[Jim Thompson]

Repeat out loud

Wa
Tana
Siam

Wa
Tana
Siam

etc

I don't remember that one. But I do remember the Order of Siam in Boy
Scouts...

Oh
Wa
Ta
Goo
Siam

...Jim Thompson

 

[petrus bitbyter]

Hi,

I am an electrical engineering student and I am interested in circuit
design. Unfortunety I am not so familiar with analog design. Therefore I
want to place my question here in the newsgroup:

Is there a method to reduce jitter without the use of PLL? Where can I
find sophisticated circuits for this?

Any help, hints and comments are highly appreciated.

Greetings Simon

What have you done yourself before asking here? A lot of circuits introduce
jitter in a lot a signals and PLL is one of them. What circuit are you
talking about? Some years ago Electronics World had an article on reducing
jitter in signals. Being an electrical engineering student you should be
able to find this (and a lot more).

petrus bitbyter

 

[JW]

I don't remember that one. But I do remember the Order of Siam in Boy
Scouts...

Oh
Wa
Ta
Goo
Siam

I remember that one from an old Odd Couple episode.

 

[vasile]

Hi,

I am an electrical engineering student and I am interested in circuit
design. Unfortunety I am not so familiar with analog design. Therefore I
want to place my question here in the newsgroup:

Is there a method to reduce jitter without the use of PLL? Where can I find
sophisticated circuits for this?

Simon,
Your question should also explain a few more thigs:
1. which is the amplitude, the frequency and the shape of the signal
having this jitter
2. at least which is the magnitude order of your requested jitter
3. which is the circuit topology which is carrying this signal (IQ,
bipolar, unipolar etc)

PLL in 90% of the situations are adding a bigger jitter than a clean
low noise oscillator output may have.
Any sophysticated circuit has a limited chance to work opposed to a
simple circuit.
Remember one thing when you'll become engineer and you'll have a lot of
employeers on your hand: keep things simple in your design and in your
relations with other people.

greetings,
Vasile