ADL5391 multiplier problem

Hello,

I am testing my new ADL5391-Evaluationboard, and coming across with the following problem. As you can see on the figures, the multiplication output is somehow disturbed. The output is not a proper sine-function anymore. Some peaks are higher, some smaller.  It seems that the two input sin/cos-functions internally get some DC before multiplication. I use the board in single-ended mode, so I added an 56Ohm resistor for R2. Any ideas how to fix this problem?

Thanks!

Best regards,

Sam

Squaring result of sine-function  

Squaring result of rect-function

Parents
  • What is the GADJ pin biased to?  Is it floating?

    Did you check all the signal paths, making sure everything is electrically connected as it should?

    Also, how much current is it drawing?  It should be about 135 mA at 5V.  I would also check all the bias levels on the pins, which should be 2.5V.

Reply
  • What is the GADJ pin biased to?  Is it floating?

    Did you check all the signal paths, making sure everything is electrically connected as it should?

    Also, how much current is it drawing?  It should be about 135 mA at 5V.  I would also check all the bias levels on the pins, which should be 2.5V.

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