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Small signal RF amplifier ideas?

Discussion in 'Electronic Basics' started by Bill Bowden, Apr 25, 2013.

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  1. Bill Bowden

    Bill Bowden Guest

    Some ideas I hear about RF amps are to decouple each stage with a
    series resistor and a cap across the stage. The resistor is chosen to
    drop a small voltage and the cap to have a low reactance. Next, use a
    low noise device in the first stage and also separate the stages
    across the board to avoid positive feedback. Another trick is to align
    any tuned inductors at 90 degree angles to minimize feedback. Also use
    double sided PB board to provide a good ground plane. Another trick is
    to shift the phase 180 degrees with a unity gain stage to further
    reduce feedback if necessary depending on layout. Is there some limit
    to the overall gain of a small signal RF amp, or does it depend on the
    noise generated by the circuit itself? I don't have much experience
    with low noise devices. What devices are recommended (transistors, op-
    amps)?

    -Bill
     
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