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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