[time-nuts] Square to sine wave symmetrical conversion (part 2)

Alex Pummer alex at pcscons.com
Sat Jul 25 14:06:15 EDT 2015


all of these oscillators, which do not deliver sinusoid output, have 
some threshold, which changes the form of  the original sinusoid wave 
shape -- since the best phase-noise performance could be generated with 
a resonator and resonators inherently generate sinusoid wave form -- and 
that said threshold is always modulated by noises [at least by thermal 
voltage noise]  which causes jitter-> phase noise
73
KJ6UHN
Alex

On 7/25/2015 3:47 AM, Charles Steinmetz wrote:
> Jerry wrote:
>
>> But back there somewhere is a sinewave.
>
> Not necessarily.  Many oscillator circuits do not deliver a good sine 
> wave to begin with (in which case you may need as much filtering to 
> get a clean sine wave as if you started with an asymmetrical square 
> wave), and many packaged oscillators have CMOS logic outputs (in which 
> case you would have to break into the sealed package to get at any 
> sine or sine-ish signal there may be).
>
> Best regards,
>
> Charles
>
>
>
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