Igure, Dmittance vs, Requency – INFICON PLO-10i Phase Lock Oscillator User Manual
Page 62: Agnitude and, Hase of, Rystal
PLO-10 PHASE LOCK OSCILLATOR
THEORY OF OPERATION
8-14
offset. The PLO-10 provides a mechanism for canceling out the imaginary current
effectively putting the center of the crystal back on the real axis. The true series resonant
frequency of the crystal is then the point where the conductance circle crosses the real
axis. This is the frequency at which the inductive and capacitive impedance’s in the L, R
& C branch cancel out and the crystal looks like a pure resistance of value R.
Figure 25 Admittance vs. Frequency, Magnitude and Phase of Low Q Crystal
MAGNITUDE
PHASE
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