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

[Bob Camp]

Hi

The narrower the bandpass of the network, the more delay it will have. The
more delay it has, the more phase shift you will have over temperature. With
a “low Q” T network, the phase shift is pretty small. It is likely you will have 
as much shift in other parts of your system as in a Q = 1 match network.

Bob

> On Jul 17, 2015, at 2:23 PM, Michael <mikenet213 at comcast.net> wrote:
> 
> 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
> 
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