Using RF6886 at 144MHz

Discussion in 'Wireless & RF Design' started by nylonman, Apr 14, 2012.

  1. nylonman

    Thread Starter New Member

    Jul 28, 2011
    9
    0
    Hi, I'm planning to use a RF6886 linear power amplifier for a project. It should operate around 144MHz and the problem is that the data sheet does not provide any data about these range of frequencies. It provides data for the 433MHz-470MHz and 865MHz-955MHz ranges only. I don't know if I'm missing something but I cant figure out how to choose the adequate components for the input and output pins, I mean, to match the impedances with the rest of the "world". I assume that the inductor-capacitor T connected at the input is a matching network. Is there any way to find out the input impedance of the chip at 144MHz using the data sheet or should I get it experimentally?

    Here is the data sheet http://www.rfmd.com/CS/Documents/RF6886DS.pdf

    Thanks in advance.
     
  2. bertus

    Administrator

    Apr 5, 2008
    15,645
    2,344
    Hello,

    In the datasheet is given that it can be used for 100 to 1000 Mhz.

    With the correct input and output matching it can be used on 144 Mhz.

    Bertus
     
  3. nylonman

    Thread Starter New Member

    Jul 28, 2011
    9
    0
    The problem is that the datasheet doesn't provide the input impedance at all frequencies. I should know it at 144MHz in order to pick the components of the matching network.
     
  4. Papabravo

    Expert

    Feb 24, 2006
    10,136
    1,786
    For $100,000 or so you could get a VNA and measure it. You might find one a bit cheaper on eBay. g\Good Luck.
     
  5. BlackCow

    Active Member

    May 11, 2009
    65
    1
    Perhaps you could make an educated guess and adjust accordingly? Or are you working with high enough power that you might fry something if the impedance isn't matched just right?
     
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