AD8347 Baseband Frequency Limitiation?

Using the AD8347 in a direct down conversion (Zero IF) application.

2.4 GHz to basband with a 9600 bps data rate.

Not seeing output as expected. Is there a frequency limitation to the baseband output (some minimum ?)?

Thanks

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  • 0
    •  Analog Employees 
    on Mar 17, 2010 12:17 AM

    9600bps is a not a large BW. Therefore, the high pass corner introduced by AC coupling should not "eat into" too much of the DC energy. I'd suggest trying setting the cap to 1uF or 10uF cap so that the the Fc is much more smaller and the relative BW is much more smaller. Currently 400 Hz corner is way too high for a 9600 bps signal.

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  • 0
    •  Analog Employees 
    on Mar 17, 2010 12:17 AM

    9600bps is a not a large BW. Therefore, the high pass corner introduced by AC coupling should not "eat into" too much of the DC energy. I'd suggest trying setting the cap to 1uF or 10uF cap so that the the Fc is much more smaller and the relative BW is much more smaller. Currently 400 Hz corner is way too high for a 9600 bps signal.

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