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FeelTech FY6600 60MHz 2-Ch VCO Function Arbitrary Waveform Signal Generator

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cybermaus:
That would be square wave or sampled wave with hard vertical edges right?

Yes, the sample jitter has been discussed quite a bit already.
But Sine is OK, showing they are in fact shifting the phase during the waveform construct.

alexvg:
I've tested the output with a spectrum analyser and finishing the design of the new output filter.
I'm going to implement the filter in the next few day.
I also found that my current version of the FY6600 generates lots of harmonics beyond 2Vpp.

Here's theorical frequency response and 10MHz square signal.


Linearity between 1M and 120M

soundtec:
I guess all the good weather has the people minds on other things  ,either way its seems to have gone very quiet lately ,
I had trouble even accessing the post as its gone from the top of the test list ,and the search didnt find it .I needed to browse to the webpage on another tab to find the post while already logged in another tab

Anyway good to see some progress Alexvg,
Will you implement the new filter on the existing pads on the board?
designing a small smd based daughter board might be a nice idea if your design works out ,
Presumably you intend better roll off of the out of band frequency ripples and also more linear behaviour over the wanted range .
I'll be very interested in the results of your tests ,how does the new filter design look in the modeling software?

alexvg:
Here is a simple test with 2 capacitors of 69pF (to validate the 50R output impedance of the DAC)

alexvg:
Some measurements...

Channel 1 without 5nd order filter at 2Vpp and 8Vpp
Channel 2 with 1st order filter at 46MHz instead of 5th order filter, tested at 2Vpp and 8Vpp

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