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FMCOMMS1 large ~30Mhz and ~90Mhz “spurs” on channel 1 ADC input

Question asked by jay_d on Apr 16, 2013
Latest reply on May 16, 2013 by mhennerich

 

  On the FMCOMMS1 I see two large “spurs” at about 30MHz and 90MHz around -60dB down for channel 1 using the IIO oscilloscope panel frequency domain, spectrum analyzer, mode with DDS and RX ADF4351 shut down. Where as if I go to channel 0 I see only the noise floor at about -90dB down.

    Is there some hardware design issue with the FMCOMMS channel 1 ADC that is causing these two large spurs?  If so is there any hardware mod that might be done to fix this?

 

 

Thanks,

James

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