Рет қаралды 1,182
In Previous Videos I mentioned, that I started a Project for a 10MHz GPS Disciplined Rubidium Frequency Standard, including a Stratum 1 NTP Server and Multiple Isolated Outputs for 10MHz Square and Sine.
This was of course one of the Projects that was put aside, bcs my Focus turned to other Designs, well I picked it up again :-)
For that Project I Designed this 4 Stages Crystal Ladder Filter and the Test Breakout Jig way back when :-) as a Proof of Concept !
In the Video I show the Functionality but the Drawbacks of it too, which are, the high Attenuation. This is due to the SMD Crystals I use (not Matched at all) and that the in/Out of the Filter isn't matched either. Its a Proof of Concept and the PCB can be used for Better same Package SMD Xtals and other Value MLCC Caps, which means the Design can be Highly Tuned without changing the PCB Layout.
Nevertheless Tuned or Not, I plan to use a Post Amplifier to equalize the Attenuation.
The are Online and PC Based Crystal Ladder Filter Calculator out there, the Results can be tested fast with the Larger Test Breakout Jig, optimized and the tried out as Mini SMD Version.
Following some Links on Crystal Ladder Filter Calculators:
Narrow band-pass crystal ladder filters
www.giangrandi...
Quartz Crystal Bandpass Filter Design
www.changpuak....
Ladder Crystal Filters For Radio Amateurs (PC Version)
warc.org.uk/?p...
Gerbers and Design Files are Available on Demand.
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#electronicscreators
#crystalladder
#bandpass