[time-nuts] xtal oscillator phase noise

Bruce Griffiths bruce.griffiths at xtra.co.nz
Thu Jan 3 15:38:44 EST 2008


Henk

If the real part of the impedance (at resonance) at the base of the
oscillator transistor is high this will significantly increase the real
part of the impedance at the emitter of the oscillator transistor seen
by the crystal thus decreasing its loaded Q. The real part of the
impedance of the tuned circuit at the oscillator base is likely to be
quite high (several kohm) at resonance and depending on the transformer
turns ratio the real part of the impedance seen by the base of the
oscillator transistor may also be significant.

Bruce



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