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Simulation of Subharmonically Injection Locked Oscillator (Read 116 times)
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Simulation of Subharmonically Injection Locked Oscillator
Nov 21st, 2017, 2:35am
I am trying to simulate an injection locked oscillator where the injection frequency (25MHz) an integer fraction of the oscillator frequency (5GHz). If I try to use PSS I have to set beat frequency very low and it does not converge. So I wanted to use QPSS but it asks to specify two periodic input tones when I have just the injection frequency as the input.  Could anyone please suggest how do we do the phase noise simulation of Subharmonically locked oscillator.
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Ken Kundert
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The Spectre

Posts: 2081
Silicon Valley
Re: Simulation of Subharmonically Injection Locked Oscillator
Reply #1 - Nov 24th, 2017, 6:55pm
An injection-locked oscillator should be simulated as a driven circuit, not as an autonomous circuit.

Choose the 'beat' frequency to be the fundamental frequency (the common submultiple of the stimulus and the locked oscillation frequency), and choose tstab to be large enough so that the oscillator reaches lock before tstab expires.

To confirm that you have the 'beat' frequency and the tstab correctly, you can run a transient analysis with strobing. You should set the strobe frequency equal to your chosen beat frequency and simulate for at least tstab. With strobing, any signal you choose should appear to either settle or at least be close to settling by the time you reach tstab.

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