RF transmitter help

Discussion in 'Wireless & RF Design' started by cotc, Apr 12, 2012.

  1. cotc

    Thread Starter New Member

    Apr 12, 2012
    My group and I are currently trying to find a way to amplify a 1 Mhz crystal signal. We were just wondering what is the simplest way to do so. Simple op-amps? Any help would be greatly appreciated! Thanks :)
  2. Papabravo


    Feb 24, 2006
    Op-Amps are of limited usefulness in RF applications because they need to have gain at DC and thus require high gain-bandwidth products to be used at even low RF frequencies like 1 MHz.

    You should study the Class-C RF amplifier. In order to do the design properly you need to characterize the output impedance of the oscillator so you can do the complex conjugate match on the input of the amplifier. Then you need to specify what the amplifier will be driving and design your output stage accordingly.

    Google "Tuna Can Transmitter" for some 2 transistor circuits that have an oscillator and an RF amplifier.
    http://www.njqrp.org/tuna/TT2 Manual revB.pdf
    cotc likes this.
  3. wmodavis

    Distinguished Member

    Oct 23, 2010
    Try a transistor.