Products > Test Equipment
FeelTech FY6600 60MHz 2-Ch VCO Function Arbitrary Waveform Signal Generator
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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