INFICON XTM/2 Thin Film Deposition Monitor - Manual (Page 100)

5 - 10
IP
N 07
4-
18
6S
XTM/2 Operating Manual
sustained as long as the gain provided by the amplifiers is sufficient to offset
losses in the crystal and circuit and the crystal can provide the required phase
shift.
Figure 5-4 Active Oscillator Circuit
The basic crystal oscillator’s stability is derived from the rapid change of phase
for a small change in the crystal’s frequency near the series resonance point,
as shown in
Figure 5-5 .
Figure 5-5 Crystal Frequency Near Series Resonance Point