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GHz signal of 1 Amp

Discussion in 'Electronic Design' started by Efthimios, Oct 17, 2007.

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  1. Efthimios

    Efthimios Guest

    Hallow people!!

    I am physics student and I need to create a GHz signal with an
    amplitude close to 1 Amp for an experiment.

    Does any of you know if this is possible????

    And if yes how??
     
  2. Microwave oven and a metal ring?
     
  3. Efthimios

    Efthimios Guest

    Good idea but I do not think I can get 1 Amp.
     
  4. Charles

    Charles Guest

  5. Efthimios

    Efthimios Guest

  6. Efthimios

    Efthimios Guest



    Do you know how much an Amplifier like this will cost??
     
  7. Phil Hobbs

    Phil Hobbs Guest

    Depends on the impedance level. Most microwaves produce 800W or more of
    2.4 GHz--with a 50-ohm impedance, you only need 6% coupling efficiency
    to get 1A rms. Figuring out how much you actually got will be the
    interesting part...you could probably just run a bit of heavy coax to a
    properly designed probe, e.g. strip the braid off the last 3 cm of the
    coax to make a 1/4-wave probe, and be very careful about RF burns due to
    not grounding the coax shield or doing anything else idiotic. RF burns
    are much nastier than ordinary burns, because they're caused by RF arcs.
    They're typically third degree, with the smell of charred flesh--and
    because they're often very deep, they can be very slow to heal. (On the
    other hand, if you got hit by the same arc at DC or 60 Hz, you'd
    probably be dead). If you don't have anyone there who understands high
    power RF, buy something from AR instead, and forget everything I said
    above.

    Cheers,

    Phil Hobbs
     
  8. Rich Grise

    Rich Grise Guest

  9. Tom Bruhns

    Tom Bruhns Guest

    As others have asked, 1 amp through what impedance? 1 amp (rms) at 50
    ohms is only 50 watts. If you think you can't get 1 amp induced in a
    metal ring in a microwave oven, you've probably never tried it (and
    then tried to remove the ring with your bare fingers).

    A magnetron is a good way to generate a lot of microwave power
    cheaply, but it's possible you have other needs, too, that you haven't
    told us about. Does the frequency matter? How about frequency
    stability? How accurately do you want to control the 1 amp? Does the
    load change over time (e.g. as it heats up)? What, exactly, is the
    load? (I can fairly easily get you one amp out of my signal generator
    that can output only +20dBm, if it's through a load of my choosing.
    Using a quarter wave long transmission line resonant at the frequency
    of interest, made from copper pipe, I can transform the 50 ohm output
    to a very low impedance. 1 amp at 0.1 ohms is only 0.1 watts, or
    +20dBm.)

    Cheers,
    Tom
     
  10. Tim Wescott

    Tim Wescott Guest

    At zero volts? Sure! You just need a resonant circuit and a way to
    excite it.

    So what _power_ level do you need?

    --
    Tim Wescott
    Control systems and communications consulting
    http://www.wescottdesign.com

    Need to learn how to apply control theory in your embedded system?
    "Applied Control Theory for Embedded Systems" by Tim Wescott
    Elsevier/Newnes, http://www.wescottdesign.com/actfes/actfes.html
     
  11. One amp, and no other thing mentioned, could just be the collector current
    in a transistor.
    Could be a simple circuit.
     
  12. colin

    colin Guest

    you can use something like a large PHEMT or MESFET

    Colin =^.^=
     
  13. JosephKK

    JosephKK Guest

    Efthimios posted to sci.electronics.design:
    First you have to be able to talk coherently about the task.
     
  14. JosephKK

    JosephKK Guest

    Efthimios posted to sci.electronics.design:
    How about you do some calculations instead of guessing and dismissing
    and disrespecting?
     
  15. JosephKK

    JosephKK Guest

    Efthimios posted to sci.electronics.design:
    Twit, your schoolwork assignment is to design and cost estimate it by
    volume.
     
  16. LVMarc

    LVMarc Guest

    yeah it is more than possible .. can source an amplifier circa 75 watts
    output.. has extra head room so that you may take this output and apply
    it to NON 50 ohm physics test cells you are likely to have. Have
    significant exwepricne in this power level and physics est cells!

    best regards,

    marc
     
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