Cheap and simple RF amp for signal generator

Discussion in 'Wireless & RF Design' started by Ziplock9000, Apr 14, 2009.

  1. Ziplock9000

    Thread Starter New Member

    Apr 14, 2009
    4
    0
    I'm looking to build a low power (within legal limits) RF power amplifier that will alow me to connect my signal generator (as the carrier wave):

    LODESTAR LGA101A AUDIO SIGNAL GENERATOR

    and a line-level audio input to make a simple AM transmitter.
    Apparently I can just use an op amp, rather than a MOSFET because of the low frequencies involved?.

    Can someone provide me with a circuit diagram and parts list?

    Appreciated, thanks.

    Signal Generator Specs:
    Output Voltage :5V Rms or more
    Output Distortion :400 Hz - 20KHz, 0.1% or Less
    (100 range for 1KHz)
    50Hz - 500KHz, 0.5% or Less
    Output Flatness :±1.5dB (refer to 1KhZ)
    Square Wave Characteristics
    Output Voltage :10V p.p or more
    Rise Time : 0.25 us or Less
    Duty ratio :50%± 5% (refer to 1KHz)
    External Synchronization Characteristics
    Range ±3% of Oscillator Frequency
    Input Impedance : 10K Approximate
    Maximum Input :10V Rms
    Output Characteristics
    Impedance :600Ω ± 10%
    Attenuator: 0dB,-20dB, -40dB in 3steps (accuracy ± 1dB at 600Ω Load)
     
  2. KL7AJ

    AAC Fanatic!

    Nov 4, 2008
    2,040
    287
    A simple class-A common base amplifier can give you around 20 dB of gain over a wide frequency range. Good educational project.

    Eric
     
  3. Ziplock9000

    Thread Starter New Member

    Apr 14, 2009
    4
    0
    How would I incorporate the two inputs (the carrier wave from the signal generator and the line-level audio input).

    Thanks.

    Are there any tutorials or reference materials that would be good for this.

    I've googled, but I don't know which solution is most suitable.

    Thanks.
     
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