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ADF4350 Eval Board Low Freq Waveforms wrong

Question asked by hardrock on Dec 15, 2014
Latest reply on Dec 15, 2014 by hardrock

I just got two ADF4350 eval boards (the single output ones) and have been running them up around 3GHz just fine but when I slowed the out freq down to 200MHz, the waveforms look AC coupled: there is a ~400ps wide rising pulse followed by a 400ps wide falling pulse at the proper freq.  With 1nf caps it should not look like that.  Any idea what is wrong? Both boards do it.  Just going into a 50 ohm scope load.