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What kind of signal do you want to delay? If it's a periodic clock,Could some analog guru please help ? Digital circuits can use a delay
locked loop to generate a negative delay - is there any corresponding
analog circuit to achieve the same result ? Any hints, suggestions
would be invaluable. Thanks in advance for your help.
On Fri, 26 Mar 2010 09:09:27 -0700 (PDT), Daku <dakupoto@gmail.com
wrote:
Could some analog guru please help ? Digital circuits can use a delay
locked loop to generate a negative delay - is there any corresponding
analog circuit to achieve the same result ? Any hints, suggestions
would be invaluable. Thanks in advance for your help.
What kind of signal do you want to delay? If it's a periodic clock,
all sorts of phase shifters or delay lines will work. A 0.75T delay
line looks like a -0.25T delay. Or invert phase and delay 0.25, same
result.
If it's a general signal, it's impossible.
John
Well, so much for the stock market investment machine I was going to build!
Or a PLL.On Fri, 26 Mar 2010 09:09:27 -0700 (PDT), Daku <dakupoto@gmail.com
wrote:
Could some analog guru please help ? Digital circuits can use a delay
locked loop to generate a negative delay - is there any corresponding
analog circuit to achieve the same result ? Any hints, suggestions
would be invaluable. Thanks in advance for your help.
What kind of signal do you want to delay? If it's a periodic clock,
all sorts of phase shifters or delay lines will work. A 0.75T delay
line looks like a -0.25T delay. Or invert phase and delay 0.25, same
result.
If it's a general signal, it's impossible.
Ayup.
It is a delay line with a variable tap, or some sort of variable RCOn Mar 26, 9:09 am, Daku <dakup...@gmail.com> wrote:
Could some analog guru please help ? Digital circuits can use a delay
locked loop to generate a negative delay - is there any corresponding
analog circuit to achieve the same result ?
Firstly, what is 'delay locked loop'?
Firstly, what is 'delay locked loop'?Could some analog guru please help ? Digital circuits can use a delay
locked loop to generate a negative delay - is there any corresponding
analog circuit to achieve the same result ?
Even a small negative delay could be put into a feedback loop to getJohn Larkin wrote:
On Fri, 26 Mar 2010 09:09:27 -0700 (PDT), Daku <dakupoto@gmail.com
wrote:
Could some analog guru please help ? Digital circuits can use a delay
locked loop to generate a negative delay - is there any corresponding
analog circuit to achieve the same result ? Any hints, suggestions
would be invaluable. Thanks in advance for your help.
What kind of signal do you want to delay? If it's a periodic clock,
all sorts of phase shifters or delay lines will work. A 0.75T delay
line looks like a -0.25T delay. Or invert phase and delay 0.25, same
result.
If it's a general signal, it's impossible.
John
Well, so much for the stock market investment machine I was going to build!
It's a delay line in the feed back path of an oscillator. A "digital PLL", ifOn Mar 26, 9:09 am, Daku <dakup...@gmail.com> wrote:
Could some analog guru please help ? Digital circuits can use a delay
locked loop to generate a negative delay - is there any corresponding
analog circuit to achieve the same result ?
Firstly, what is 'delay locked loop'?
When one needs a signal and a delayed copy of that signal, one uses
a delay line (simplest is just a long cable). Then, the events
on the signal cable are occurring prior to those on the delay line,
and you can refer timings to the delay-line-output and
call the direct signal 'negative delay'. That's how an
oscilloscope can trigger on a pulse and still show the
lead-up to the pulse on the display.
That depends on your phase detector. If you're talking about a classicOn Mar 26, 9:20 pm, John Larkin
jjlar...@highNOTlandTHIStechnologyPART.com> wrote:
What kind of signal do you want to delay? If it's a periodic clock,
all sorts of phase shifters or delay lines will work. A 0.75T delay
line looks like a -0.25T delay. Or invert phase and delay 0.25, same
result.
If it's a general signal, it's impossible.
John
The problem I am trying to solve is :
Consider an analog PLL and the reference signal is pure sinusoidal. In
a "locked in" mode, the VCO output will be a sinusoidal signal of
exactly same frequency as the reference signal, but has an added phase
(basically delay),
because of the way the VCO works. So is there a way to remove this
phase ??
What kind of signal do you want to delay? If it's a periodic clock,
all sorts of phase shifters or delay lines will work. A 0.75T delay
line looks like a -0.25T delay. Or invert phase and delay 0.25, same
result.
If it's a general signal, it's impossible.
John
Cool. So with a small TLine put in a feedback loop will give looongOn Fri, 26 Mar 2010 09:26:24 -0700, Tim Wescott <tim@seemywebsite.now
wrote:
John Larkin wrote:
On Fri, 26 Mar 2010 09:09:27 -0700 (PDT), Daku <dakupoto@gmail.com
wrote:
Could some analog guru please help ? Digital circuits can use a delay
locked loop to generate a negative delay - is there any corresponding
analog circuit to achieve the same result ? Any hints, suggestions
would be invaluable. Thanks in advance for your help.
What kind of signal do you want to delay? If it's a periodic clock,
all sorts of phase shifters or delay lines will work. A 0.75T delay
line looks like a -0.25T delay. Or invert phase and delay 0.25, same
result.
If it's a general signal, it's impossible.
John
Well, so much for the stock market investment machine I was going to build!
Even a small negative delay could be put into a feedback loop to get
arbitrary long negative delays, enough to see the Drudge Report a week
in advance.
John
That depends on your phase detector. If you're talking about a classic
mixer-style phase detector that returns zero error when the VCO is 90
degrees off from the reference -- yes.
So you can solve that, either by making a network that phase shifts the
VCO by 90 degrees before applying it to the phase detector, or -- if
your reference is also a pure tone -- by using a digital reference
detector that returns zero error when the phases match.
--
Tim Wescott
Control system and signal processing consultingwww.wescottdesign.com
Bummer!On Mar 26, 9:09 am, Daku <dakup...@gmail.com> wrote:
Could some analog guru please help ? Digital circuits can use a delay
locked loop to generate a negative delay - is there any corresponding
analog circuit to achieve the same result ? Any hints, suggestions
would be invaluable. Thanks in advance for your help.
A very common instance of this is 'advanced sync' used in television
to make a video source create a signal early so by the time it goes
through processing it's at the desired time. As Larkin said, it only
works with a periodic signal. AND, that 'advanced' signal is only
delayed 'almost' 1 time period back so it seems advanced. It's not -
so Tim Westcott can't have his investment machine.
A very common instance of this is 'advanced sync' used in televisionCould some analog guru please help ? Digital circuits can use a delay
locked loop to generate a negative delay - is there any corresponding
analog circuit to achieve the same result ? Any hints, suggestions
would be invaluable. Thanks in advance for your help.