Amplify the signal generator current ?

Discussion in 'Homework Help' started by Meshaal, Dec 10, 2012.

  1. Meshaal

    Thread Starter New Member

    Dec 10, 2012
    3
    0
    Gentelman,

    I have signal generator with 50 ohm impedance
    Is there any circuit to amplifier the current but let the voltage input=output?

    Sugnal generator output:
    Sign wave 5MHz
    5 volt.

    I want to amplify the output current its too low.
     
  2. tshuck

    Well-Known Member

    Oct 18, 2012
    3,531
    675
    I'm not sure about the frequency responses, but I'm sure you can do something along these lines...

    Common Collector amplifier can do it, but there are others too.

    Basically, any voltage follower circuit that can operate near 5MHz should work...
     
  3. Meshaal

    Thread Starter New Member

    Dec 10, 2012
    3
    0

    i already use the Common Collector but its still not working , im trying to get 1mW output .....
     
  4. WBahn

    Moderator

    Mar 31, 2012
    17,777
    4,805
    Your original post said you had 5V and a 50Ω output. Are you getting 5V across a 50Ω load? If so, then is that 5V peak or RMS? If it's RMS, then you should be getting 500mW to the load. If it's not, then we need a lot more information about your signal generator and your load.
     
  5. MrChips

    Moderator

    Oct 2, 2009
    12,449
    3,365
    Current is related to the voltage by Ohm's Law, I = V/R.

    If your load is 50Ω the the current is predetermined by the voltage.

    Do you mean to enquire about increasing the current output capability of the signal generator when drive a load that is less than 50Ω?
     
  6. Meshaal

    Thread Starter New Member

    Dec 10, 2012
    3
    0
     
  7. WBahn

    Moderator

    Mar 31, 2012
    17,777
    4,805
    What is the load that you are trying to drive?

    What is the voltage that you are seeing across the load when connected to your generator?

    What kind of voltage is it? Amplitude? RMS? Peak?

    What is the shape of the waveform? Sinusoid? Triangle? Square?
     
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