PSpice Application Notes

PSpice App Note_Modelling Quartz Crystals Purpose

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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

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