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

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alexvg:
I've done the output 11th order filter with SMD components.



alexvg:
All tests have been done with 50R load.

Sine sweep 0.5-30MHz - Spectrum 1-500MHz lin - 10dB/div - No filter (yellow) vs 11th order filter (magenta)


Sine sweep 0.5-30MHz - Spectrum 1-50MHz lin - 1dB/div - No filter (yellow) vs 11th order filter (magenta)


Sine sweep 0.5-30MHz - Spectrum 0.1-50MHz log - 1dB/div - No filter (yellow) vs 11th order filter (magenta)


Multitone sweep 0.5-12.45MHz - Spectrum 0.1-50MHz log - 1dB/div - No filter (yellow) vs 11th order filter (magenta)


Multitone sweep 0.5-12.45MHz - Spectrum 0.1-500MHz lin - 10dB/div - No filter (yellow) vs 11th order filter (magenta)




alexvg:
All tests have been done with 50R load and 20dB att.

Yellow : no filter
Magenta : 11th order filter

1MHz square output


5MHz square output


10MHz square output


25MHz square output


30MHz square output

alexvg:
Final measurement... with 50R load.

1MHz signal (blue = no filter, green = 11th order filter)



1MHz signal without any filter (yellow)


1MHz signal with 11th order filter (magenta)

alexvg:
Result
The filter is not shielded some DAC harmonics could not be correctly filtered. These harmonics and parasitics frequency cound be measured on the output.

Next time ?
Replace 50MHz oscillator with a new one (+/-1ppm).

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