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Envelope amplifier

Haider Al kanan
Prodigy 90 points
Other Parts Discussed in Thread: THS6012I need to build Envelope tracking power amplifier , using main power amplifier with supply voltage 8-15volt , how to select envelope amplifier (driver) for that power amplifier if I need to feed that envelope amplifier with signal from Agilent signal generator? Do I need DSP module between the envelope amplifier and signal generator?
  • 0
    TI__Genius 13935 points
    Hello Haider,

    Have you contacted Agilent about their test equipment? We can't help much with configuring Agilent test equipment.

    If you can post your voltage in, voltage out and bandwidth specifications we can recommend a buffer amplifier. A system block diagram would also help.

    Regards,
    Loren
  • 0 in reply to Loren Siebert 1
    Prodigy 90 points
    Hi Loren, Thanks for response, the Agilent SG output power is 17dbm max as input to the driver , and I need 15volt max output from the driver, can I get driver meet that specs or might need extra amplifier . My bandwidth is around 20MHz. The driver output current around 500mA
  • 0 in reply to Haider Al kanan
    TI__Genius 13935 points
    Hello Haider,

    4.47Vpp to 15Vpp is a gain of 3.4V/V. A 20MHz signal at 15Vpp is 950 V/us slew rate. The driver output current is combined with the output voltage is 2.5Watts of power.

    It looks like the THS6012 may meet these needs.

    www.ti.com/.../ths6012.pdf

    With this amount of power you will need to have a good thermal design, possibly even a heat sink.

    This is the product selection page with 400mA or higher.

    www.ti.com/.../high-speed-op-amps-products.page



    Regards,
    Loren
  • 0 in reply to Loren Siebert 1
    Prodigy 90 points
    Thanks Loren, I had a look on the data sheet and read a statement saying the typical unity gain at 15v supply , so Does that card has varivable resistors to change the gain, or how?
    I also looking for DSP board that calculate the envelope from a complex OFDM signal I+jQ which is around 20MHz bandwidth baseband. The DSP output is fed to PA using a driver in between . I also need to write a math function on DSP board as a relation between input and output voltage