transmitter current limiting

Discussion in 'Wireless & RF Design' started by ant17, Jun 23, 2013.

  1. ant17

    Thread Starter New Member

    Jun 23, 2013
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    0
    hi i bulit 555 timer circuit running at 100khz square wave driving the gate through a 10 ohm resistor the with source connected to ground i want antenna connected at the drain and want apply 12 volts to the drain but i want to limit the through the drain to 6 amps or 72 watts how is this normally achived as a 10watt resistor would burn up
     
  2. Papabravo

    Expert

    Feb 24, 2006
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    1,800
    You don't us a resistor for an RF load. BTW such a signal would be illegal at those power levels. Expect large fines and or jail time if you get caught.
     
  3. ant17

    Thread Starter New Member

    Jun 23, 2013
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    0
    what do you use as a rf load on a mosfet rf amplifier
     
  4. Papabravo

    Expert

    Feb 24, 2006
    10,179
    1,800
    You use something that has the appropriate impedance at the frequency of operation.
     
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