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ADL5391 multiplier problem

Question asked by Sam87 on Jan 22, 2015
Latest reply on Jan 26, 2015 by jdobler

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

mult2.jpg

Squaring result of sine-function  

F0001TEK.BMP

Squaring result of rect-function

F0002TEK.BMP

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