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frequency mixing : ~ns electrical pulse at 100kHz + 400MHz RF sinusoidal wave

Discussion in 'Electronic Basics' started by Q-man, Nov 27, 2004.

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  1. Q-man

    Q-man Guest

    I would like to mix two electrical waves. One is ~ns electrical pulse
    at 100kHz and other is a 400MHz RF sinusoial wave.

    Would you please recommend any device which can mix two waves?

    I've heard that a GaAs SPDT switch or frequency mixer can do this kind
    of job.
    If you know how to use this kind of device, would you tell me the
    instruction of the operation?

    Thanks.
     
  2. John Fields

    John Fields Guest

     
  3. dB

    dB Guest

    (Q-man) wrote


    A diode. It's the simplest mixer there is.
     
  4. ddwyer

    ddwyer Guest

    Mixing is multiplication so that you wish to multiply the 400MHz sine
    with 0 or 1 at 100kHz . A switch can be used the The limits are how
    perfect the switch can be.
    Minicircuits double balances mixers would be as good as any solution.
     
  5. Q-man

    Q-man Guest

    I would like to mix two electrical sources. One is ~ns electrical
    pulse at 100kHz and the other is 400MHz RF sinusoidal wave.

    I think there is a problem to use the frequency mixer to combine two
    signals.
    It is because the nsec electrial pulse at 100kHz has a DC component. I
    cannot find any frequency mixer has DC output from IF port.

    May I hear your opinion ?
     
  6. Q-man

    Q-man Guest

    sorry for making a mistake. This is a correction.

    It is because the nsec electrial pulse at 100kHz has a DC component. I
    cannot find any frequency mixer has "DC input" from either RF or LO port.
     
  7. John Larkin

    John Larkin Guest

    Actually, the DC component will be very small if the duty cycle is
    nanoseconds per 10 microseconds. Still, ring diode mixers will let a
    lot of signal through with zero LO input.

    Fairchild has a bunch of interesting analog switches...

    http://www.fairchildsemi.com/parame...:3//Function//:in//Analog+Switch,Video+Switch


    John
     
  8. Q-man

    Q-man Guest

    That's right. If duty cycle is getting smaller, that effect will be
    minimized.

    By the way, I would like to try to use the SPDT switch to generate the
    mixed signals. I contact the Minicircuit but it is hard to understand
    how to use.
    If you know how to use this switch, would you please tell me ? There
    are five ports in this switch. RF in, control ports 1 and 2, RF out 1
    and 2. Especially i am confused about control ports.

    model : ZFSW-2-46
    http://www.minicircuits.com/dg03-218.pdf

    Thanks.
     
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