TheOddPandy
Newbie level 2
Hello everyone,
I'm trying to simulate injection locked oscillator(ILO) with cadence.I use the subharmonic as the injection source,I design a 20G oscillator to inject the 60G oscillator.
But when I use pss and pnoise to simulate,I found a problem.The phase noise is almost equal to the phase noise of the 20G oscillator,but theoretically use a 20G injection source with low phase noise to a 60G oscillator should cause a 20log3(about 9dB) phase noise deterioration at least.
I'm attaching my pss,pnoise setup and spectre.out(Vout3 and Vout4 is the different output of the 60G oscillator).You can see "the periodic noise analysis 'pnoise':freq=20.4564GHz" in the spectre.out.I think this maybe the reason why my phase noise is almost equal to the phase noise of the 20G oscillator.
So I think I may make mistakes in pss and pnoise setup.I didn't know how to simulate two oscillators with different frenquencies together.What's mistake in my setup,or my circuit maybe wrong,fail to locked?Should I try to use ads to simulate?
Please help me.
Thanks a lot!
I'm trying to simulate injection locked oscillator(ILO) with cadence.I use the subharmonic as the injection source,I design a 20G oscillator to inject the 60G oscillator.
But when I use pss and pnoise to simulate,I found a problem.The phase noise is almost equal to the phase noise of the 20G oscillator,but theoretically use a 20G injection source with low phase noise to a 60G oscillator should cause a 20log3(about 9dB) phase noise deterioration at least.
I'm attaching my pss,pnoise setup and spectre.out(Vout3 and Vout4 is the different output of the 60G oscillator).You can see "the periodic noise analysis 'pnoise':freq=20.4564GHz" in the spectre.out.I think this maybe the reason why my phase noise is almost equal to the phase noise of the 20G oscillator.
So I think I may make mistakes in pss and pnoise setup.I didn't know how to simulate two oscillators with different frenquencies together.What's mistake in my setup,or my circuit maybe wrong,fail to locked?Should I try to use ads to simulate?
Please help me.
Thanks a lot!
Last edited: