[SI-LIST] Parallel Resonance of crystall oscillator
- From: Parthasarathy Sampath <parthsv@xxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Wed, 8 Jan 2003 18:59:56 -0800 (PST)
Hi all,
I have a question regarding crystall oscillator
operating at parallel resonance.
At parallel resonance, the impedance offered by
series resonant ckt within crystal oscillator is
inductive. This inductive reactance is cancelled by
the capacitive reactance offered by parallel
capacitance in the crystall oscillator and the load
capacitance. So there should not be any phase in the
circuit since the reactances get cancelled. However a
lot of articles say load capacitance provide a phase
shift of 180 in order to oscillate in closed loop.
Since the load capacitance is included in the parallel
resonance to cancel inductive reactance, how can it
contribute 180 degress phase shift.
Thanks in advance,
Partha
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