Risto Tiilikainen wrote:

JJ wrote:

"Highest performance"? Is that output amplitude? Or minimum startup
time? Or startup reliability? Or lowest power requirement? Or what?

Jitter, that's a little easier to define but it's usually not the most
relevant parameter in radio. It is related to sideband and phase noise
and in fact cannot be completely decoupled from either.


tor :-)


Tim KA0BTD





Its not for a radio. I want to minimize the cycle to cycle variations
in timing and it should be simple enough to make with 1 or 2
transitors. So not looking for NASA spec stuff, just reliable so it
starts every time.

JJ


Hi !

Any of those oscillators is OK if resonance circuit Q is kept high and
oscillation power in average low level.
High Q will guarantee easy and fast starting every time
Average low level keeps components cool and cycle to cycle variations
are reduced
Third important question is loading the oscillator.
High impedance FET buffer which is not galvanic ally connected to
oscillator is very good solution.
The gate of buffer FET can be provided with an "antenna" wire
collecting tiny energy from the oscillator resonance circuit.
This kind of loose coupling guarantees that effects of external
variations are minimized.

These principles also guarantee that buffer will amplify 1st order and
upper harmonics are powerfully reduced (in oscillator and in first
buffer)
I have experienced superior results with these guidelines when
constructing LC oscillators

73, Risto OH2BT

HI !
Sorry . I read again your subject.
You were asking from crystal oscillators and I began to explain LC
oscillators
Risto