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AD9959, relative phases in a frequency sweep

Question asked by pandey on Apr 3, 2017
Latest reply on Apr 25, 2017 by JLKeip

Hi there,

 

I have an AD9959 with the evaluation board.

 

We want 3 RF outputs at 2MHz controlled via USB and external triggers at P0, P1 and P2 at U2. First, we want some hold in the output, all the frequencies and phases to be same and then a linear frequency sweep in one of the channel.

 

What I observe is, at the beginning of ramp relative phases are stable BUT not at the end of the ramp. 

 

How can I solve this problem?

 

Regards,

Saurabh.

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