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

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bugi:
In the first results measurement, with sine and multitone with linear and log graphs, I think you accidentally swapped the markings between filter and no filter sine curves between the linear and log graphs. At least they would match each other correctly if either screenshot swaps those two. I'd guess the linear should do the swap as it currently claims that the 11th order filter has less loss than no filter.

alexvg:
Edit: Previous measurements are corrected.

Crosstalk measurement
The crosstalk occurs after the filter, between LNS1/LNS2 and final output.

Yellow curve - CH1 with multitone 0.5-12.45MHz (no filter)
Magenta curve - CH2 off (11th order filter)


Yellow curve - CH1 off (no filter)
Magenta curve - CH2 with multitone 0.5-12.45MHz (11th order filter)

alexvg:
I'm working on a highly optimized 5th order filter and simple to build to replace the complex 11th order filter which could be hard to build for the beginner.

or

alexvg:
I've done the schematic of the new filter at build it... With 5% capacitors and inductances (without any sort).

I've currently working on the same filter but with selected capacitors and inductances.

The schematic



The circuit



Multitone sweep -11th (magenta) vs 5th (yellow) order filter, 1dB/div, 100MHz lin


Multitone sweep -11th (magenta) vs 5th (yellow) order filter, 5dB/div, 100MHz lin


Multitone sweep -11th (magenta) vs 5th (yellow) order filter, 3dB/div, 125MHz lin


Multitone sweep -11th (magenta) vs 5th (yellow) order filter, 6dB/div, 125MHz lin


Multitone sweep - 11th (magenta) vs 5th (yellow) order filter, 10dB/div, 500MHz lin


Sine sweep - 11th (magenta) vs 5th (yellow) order filter, 1dB/div, 50MHz lin


Sine sweep - 11th (magenta) vs 5th (yellow) order filter, 10dB/div, 500MHz lin


Square signal at 2.5MHz - 11th (magenta) vs 5th (yellow) order filter


Square signal at 5MHz - 11th (magenta) vs 5th (yellow) order filter


Square signal at 10MHz - 11th (magenta) vs 5th (yellow) order filter


Square signal at 25MHz - 11th (magenta) vs 5th (yellow) order filter


Channel crosstalk
Yellow : measurement on 5th order filter channel at off state, 11th order filter channel with multitone sweep.
Green : measurement on 5th order filter channel at off state, 11th order filter channel with multitone sweep at off-state !!!
Magenta : measurement on 11th order filter channel at off state, 5th order filter channel with multitone sweep.
Blue : measurement on 11th order filter channel at off state, 5th order filter channel with multitone sweep at off-state !!!


Pro and cons of this 5th order filter "1st version"
- Need to select with high precision the capacitors and inductances
- Very simple and fast to install
- The compensation filter provides excellent linearity
- The square signal is more raw with lot of harmonics than soft square signal with the 11th order filter

Ebel0410:
Hi Alex,

That's a wonderful and helpful hack you did here, many thanks.
Work in progress I would say...

I didn't see the schematics of the 11th order filter published, could you please provide it us with de components values ?
(what filter designing soft are you using, Qucs?)

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