The Crystal Filter

The BSS, in it’s present incarnation, will have an IF at 9 Mhz and individual input RF bandpass filters for each ham band. The filters will be switched with FST3257 CMOS switches. A 6-pole, 9 Mhz QER crystal filter has been prototyped with low-cost ECS crystals from Digikey and looks very good. Here is the LTSpice design analysis:





Actual measured results are quite close. I’ll post them when I get a chance.


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Q R P e r

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Dian Kurniawan

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