AD8638 Gain issue

Dears,

        There's application that use AD8638 in RF receive front end. And  use it under third order intermodulation situation(input signal frequency is 60MHz) there just up to 28dBm(and the data sheet note it can meet 33dBm)  . Does there any advice or solve way to implement to the max gain in this application ?

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    •  Analog Employees 
    on Jan 7, 2019 5:23 PM

    Are you over driving the AD8368?  Its output third-order intercept (OIP3) is indeed 33 dBm, but that is a calculated number based off fundamental tones of much lesser power level. 

    Output P1dB is +16 dBm and max gain is 22 dB, so the biggest signal you can apply at the input is -6 dBm (at max gain).  Please ensure that the signal levels are below the output P1dB and associated input P1dB = OP1dB - Gain.

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  • 0
    •  Analog Employees 
    on Jan 7, 2019 5:23 PM

    Are you over driving the AD8368?  Its output third-order intercept (OIP3) is indeed 33 dBm, but that is a calculated number based off fundamental tones of much lesser power level. 

    Output P1dB is +16 dBm and max gain is 22 dB, so the biggest signal you can apply at the input is -6 dBm (at max gain).  Please ensure that the signal levels are below the output P1dB and associated input P1dB = OP1dB - Gain.

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