Analog neagtive delay generator - please help
in [Basics]
|
Prev: If you’re installing radio communications, data tracking, visual displays or navigation equipment.
Next: Galvanic disconnection with transformer
From: Daku on 26 Mar 2010 12:09 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.
From: John Larkin on 26 Mar 2010 12:20 On Fri, 26 Mar 2010 09:09:27 -0700 (PDT), Daku <dakupoto(a)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
From: Tim Wescott on 26 Mar 2010 12:26 John Larkin wrote: > On Fri, 26 Mar 2010 09:09:27 -0700 (PDT), Daku <dakupoto(a)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! -- Tim Wescott Control system and signal processing consulting www.wescottdesign.com
From: Tim Wescott on 26 Mar 2010 12:27 John Larkin wrote: > On Fri, 26 Mar 2010 09:09:27 -0700 (PDT), Daku <dakupoto(a)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. Or a PLL. > If it's a general signal, it's impossible. > Ayup. -- Tim Wescott Control system and signal processing consulting www.wescottdesign.com
From: whit3rd on 26 Mar 2010 18:42
On Mar 26, 9:09 am, Daku <dakup...(a)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. |