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How to simulate a crystal oscillator In LTspice?
Not open for further replies. I’m attaching an LTspice file that simulates a crystal oscillator with resonant frequency 1MHz, and it works fine. But if I change L1 from 2.5 H to 9.8 mH to simulate a crystal oscillator with resonant frequency 16MHz, it flat-lines (no oscillations).
Is it possible to simulate a 2 MHz crystal oscillator?
This means that it is very impractical to simulate such an oscillator in a transient (time) simulation as it will take very long to reach a stable state as amplitude changes take extremely long (many cycles of that 2 MHz).
Can a crystal oscillator be fooled by a high Q?
With a crystal oscillator you can very easily be fooled by the high Q because when you excite the crystal, it appears to keep oscillating in the simulation while in practice the oscillation will die out. Thanks for contributing an answer to Electrical Engineering Stack Exchange!
What kind of circuit can I use to model quartz?
This document explains how a Quartz Crystal can be modeled using a series RLC circuit and a parallel (package) Capacitor. Please note that Crystal Oscillators are available in the XTAL.OLB Library under the SPB/OrCAD Installation.
What kind of resonance does a quartz crystal have?
Quartz crystal oscillators tend to operate towards their “series resonance”. Figure 1: Equivalent Electrical Model The equivalent impedance of the crystal has a series resonance where Cs resonates with inductance, Ls at the crystals operating frequency.
Is it possible to simulate a crystal oscillator?
Good point that simple scaling may not work and more inductance may be needed. Crystal oscillators can be difficult to simulate. A typical 16 MHz oscillator will take around 0.2 ms to start up, and so the amplitude for the first 1000 cycles will be tiny. The digitisation of the simulator may prevent it working.