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high frequency amplifier

Discussion in 'General Electronics Discussion' started by mahin, Aug 12, 2012.

  1. mahin

    mahin

    11
    0
    May 2, 2012
    hi everybody
    i need an amplifier circuit:
    ***output impedance of signal generator(is available)=600 ohms
    ***load has capacitive impedance and very low (i don't know exact value) so output impedance of amplifier should be =<10 ohms.
    ***frequency range is 100-500 kHz.
     
  2. john monks

    john monks

    693
    1
    Mar 9, 2012
    Have you considered using an operational amplifier?
    What gain do you need?
    What is your application?
     
  3. Electrobrains

    Electrobrains

    259
    5
    Jan 2, 2012
    You could use a power operational amplifier like the Apex/Cirrus type PA16.
    It has 350kHz Power Bandwidth (in 10 Ohm), but costs a bit.

    Or look at a cheaper, maybe still useful type: OPA548T

    Or you take a faster, cheaper amplifier and build your own power stage to it.
     
    Last edited: Aug 12, 2012
  4. Alchymist

    Alchymist

    26
    2
    Apr 16, 2011
    Use a darlington pair and configure it for an emitter follower output.
     
  5. CDRIVE

    CDRIVE Hauling 10' pipe on a Trek Shift3

    4,960
    648
    May 8, 2012
    You didn't state what output voltage (PP) you need and what the waveform will be, Sin, Square, Triangle ? Does the signal have go negative?
     
  6. mahin

    mahin

    11
    0
    May 2, 2012
    sine and output=<25v, and....very low output impedance (5-10 ohms). have negative voltage.
     
  7. mahin

    mahin

    11
    0
    May 2, 2012
    thank you, do you know output impedance of opa548a? it isn't in datasheet.
     
  8. Electrobrains

    Electrobrains

    259
    5
    Jan 2, 2012
    You have to calculate that from your own given conditions and the specs and diagrams in the data sheet (MAXIMUM OUTPUT VOLTAGE SWING vs FREQUENCY, MAXIMUM POWER DISSIPATION vs AMBIENT TEMPERATURE, SAFE OPERATING AREA, OUTPUT VOLTAGE SWING vs OUTPUT CURRENT etc.)

    Or, make it practical - buy one and test it (cheapest place found on ebay, but in China)
     
  9. CDRIVE

    CDRIVE Hauling 10' pipe on a Trek Shift3

    4,960
    648
    May 8, 2012
    Impressive OpAmp!
    Found this in the data sheet... " A SPICE macromodel is available for design analysis."

    It's not in the data sheet. Do you know where it can be downloaded from?

    Thanks,

    Chris

    Edit: Found it. See next post.
     
    Last edited: Aug 13, 2012
  10. CDRIVE

    CDRIVE Hauling 10' pipe on a Trek Shift3

    4,960
    648
    May 8, 2012
  11. CDRIVE

    CDRIVE Hauling 10' pipe on a Trek Shift3

    4,960
    648
    May 8, 2012
    What's the max VPP output of your Gen when terminated into 600Ω?
     
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