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Clock to run a circut, new way?

Discussion in 'Electronic Design' started by Saint, Feb 19, 2005.

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  1. Saint

    Saint Guest

    Hello, im a uni/collage student and while experimenting in the lab I
    created a small system which produces a 5V square wave signal to power
    a digital TTL/CMOS circut. However, unlike the traditional clocks, e.g
    555 timer, This clock uses no capcitor to create the delay for the
    frequency. It works and is fully tested, with lab components and can
    reach speeds of up to 17MHz. I am not sure if it has been invented
    before, or even if it would be useful, but it could possibly be faster
    or cheaper than some of its counterparts. Sorry I can not tell you how
    I built it as i have not yet got a patent and want to keep it on the
    low. Has anyone heard of something similar? or know any advantages of a
    capacitorless clocking device? Any help with this would be appreciated.
     
  2. Ken

    Ken Guest

    Since it's been "fully tested", what're the spec's? Low frequency
    capability? Accuracy? Stability? Output drive? Operating voltages and
    current requirements?
     
  3. Fred Bloggs

    Fred Bloggs Guest

    Delay? Did you say delay? What a novel concept.
     
  4. Ian Stirling

    Ian Stirling Guest

    There are many such devices.
    Phase delay schemes, for example using multiple amplifiers or gates, or
    R/C or R/L or L/C networks, transmission lines, or ... in order to provide
    a frequency dependant delay in combination with an amplifier to make a
    clock.
    Or mechanical schemes, using vibration of crystals or tuning forks, or ...
     
  5. Pooh Bear

    Pooh Bear Guest

    You'll need to ensure it works at 3 - 3.3 V too for it to be of any general
    interest not to mention lower voltages too.

    How accurate is the frequency ? Unit to unit.

    17MHz isn't fast enough for lots of stuff btw.

    When I last checked, you can't patent a 'circuit'. It has to be an
    application. The Chinese don't care much for intellectual property law - so
    it'll get ripped off anyway. ;-)


    Graham
     
  6. Luhan Monat

    Luhan Monat Guest

    Yo,

    The chance that you have something original here is vanishingly small,
    and the odds of getting a patent are even worse.
     
  7. Saint wrote...
    Relaxation oscillators without any obvious explicit capacitors are
    common, but they do have capacitors, which are an intrinsic part of
    the components in the oscillators. Consider using logic gate delay.
    This delay is due to capacitance and stored charge in the wiring and
    transistors making up the gate. For example, a logic-inverter ring
    oscillator, where the frequency is tuned with the IC supply voltage.
     
  8. Fred Bloggs

    Fred Bloggs Guest

    ....any old amplifier with positive feedback...
     
  9. keith

    keith Guest

    Sure you can patent a circuit. It's not generally done because it's too
    easy to circumvent a "topology" patent. Not too many others care much
    about IPL either, unless you have some expensive hired hands.
     
  10. Tim Shoppa

    Tim Shoppa Guest

    while experimenting in the lab I
    Yeah, most of the time when I set out to build an amplifier it
    oscillates instead :). Don't worry, you'll get better at it...
     
  11. mercury columns
     
  12. keith

    keith Guest

    The programmer's corrilary: "Constants aren't and Variables won't."
     
  13. Luhan Monat

    Luhan Monat Guest

    Old saying among analog engineers: "Oscillators dont - everything else
    does".
     
  14. Ian Stirling

    Ian Stirling Guest

    Covered by the above.
     
  15. John Larkin

    John Larkin Guest

    ^^^^
    AC


    John
     
  16. Ken Smith

    Ken Smith Guest


    Way back when I was a mere lad, I knew someone who had invented a very
    slow PNP transistor. Only after he invented it did he discover that he was
    about the 3rd to do so. The HFE of the device was low because the base
    was effectively about a foot thick. Its great charm was that if you
    applied a pulse on the base, a pulse would appear on the collector with a
    lot more delay than the frequency responce of the circuit would suggest.
    The extra delay was due to the holes having to wander through some sort of
    magic doping gradient in the base. Perhaps this has just been
    re-invented.
     
  17. Ken Taylor

    Ken Taylor Guest

    "Some girls will, some girls won't."

    Ken
     
  18. Ian Stirling

    Ian Stirling Guest

    And some oscillate between the two extremes.
     
  19. keith

    keith Guest

    Most go only one way though.
     
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