FreeLists / si-list / [SI-LIST] Re: Parallel Resonance of crystall oscillator

[ViswanathanRavi@xxxxxxxxxxxxxx]

U have missed the NOT gate in the crystal that provides 180 deg shift. Add 
that to the 2 caps and u have 360 deg phase shift


-Ravi Viswanathan





Parthasarathy Sampath <parthsv@xxxxxxxxx>
Sent by: si-list-bounce@xxxxxxxxxxxxx
01/09/2003 08:29 AM
Please respond to parthsv

 
        To:     si-list@xxxxxxxxxxxxx
        cc: 
        Subject:        [SI-LIST] Parallel Resonance  of crystall oscillator



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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