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Simulators >> RF Simulators >> Phase Noise Simulation for Frequency Dividers
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Message started by Alez on Sep 6^th, 2004, 4:21am

Title: Phase Noise Simulation for Frequency Dividers
Post by Alez on Sep 6^th, 2004, 4:21am

Hi

I'm trying to simulate the phase noise of an injection-

locked frequency divider by configuring it like this:

1. I built an oscillator, a normal negative-resistance oscillator.

2. I simulated the phase noise of this oscillator using PSS and PNoise. Then, collected the result.

3. I connected this oscillator to the frequency divider.

The question is:

How can I simulate the phase noise of the frequency divider because now my divider is working as a "locked oscillator", i.e. the oscillator having an input ???

Thank you so much.

Alez

Title: Re: Phase Noise Simulation for Frequency Dividers
Post by Jitter Man on Sep 6^th, 2004, 9:15am

To simulate the noise of an oscillator with a frequency divider, you combine them and treat the pair as an oscillator. The only real difference between simulating the oscillator alone and the oscillator with the divider is that the expected output frequency is specified to be N smaller when the divider is present, where N is the divide ratio of the divider. Also, the pair of nodes that Spectre monitors should be associated with the output of the divider so that Spectre is observing a signal with a strong component at the fundamental frequency.

[glb]Jitter Man[/glb]

Title: Re: Phase Noise Simulation for Frequency Dividers
Post by Alez on Sep 7^th, 2004, 1:23am

thank you for your reply JitterMan

I will try it :)