[time-nuts] 10MHz Square to Sine Wave Conversion

[Michael]

Before I waste time simulating too much...

Does anyone have any intuition around temperature dependence of these designs? Is one 'style' significantly better than another?

I'm far more concerned about phase shift of the fundamental during temperature swings than I am relative harmonic levels/phase moving around. 

Michael

> Hi

> But your 3 pole will not be as good as my 5 pole. My 5 pole will not be as good as the next poster’s
> 13 pole. My 5 added traps will not do as much as the next poster’s 13 traps.

> What *will* happen as all of these parts are added:

> 1) It becomes a real mess to properly lay out and align
> 2) Even with good equipment, you will need ever more accurate parts to implement it
> 3) The sensitivity of the result to minor parts variation will keep going up. (I get -180 dbc here and “only” -120 dbc 1% away).
> 4) The odds of anybody actually building one go down probably as the square of the number of parts involved. 

> The simple filter topology posted earlier by Charles is indeed quite adequate. You can get -60 dbc harmonics without
> going very crazy on the design. Part values can either be calculated from formulas that have existed for > 80 years
> or you can play with simulation. 

> Bob