APPLICATION NOTE
3
Figure 3: Equivalent Circuit (Model) Parameters
L1 = 2.5, C2 = 0.01pF, R1 = 640Ω, C1 = 2.5pF
Series Resonant Frequency
f
s
= 1/2π√ L
s
C
s
= 1/2π√ 2.5*0.01p = 1.0065MHz
Parallel Resonant Frequency
f
p
= 1/2π√ L
s
(C
p
*C
s
)/(C
p
+C
s
) = 1/2π√ 2.5(2.5p*0.01p)/(2.5p+0.01p) = 1.0085MHz
Crystal Oscillators Q-factor
Q = X
L
/R = 2πfL/R = (2π*10
6
*2.5)/640 = 0.0245436*10
6
= 24543 ≈ 25000
Figure 4: Simulation Results
© Copyright 2016 Cadence Design Systems, Inc. All rights reserved. Cadence, the Cadence logo, and Spectre are registered trademarks of Cadence
Design Systems, Inc. All others are properties of their respective holders