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oscillator jitter measurement(jc , jcc)

analogdesign

Hai sir,

        I am simulating the LC VCO at a free running frequency of 5GHz. 

PSS settings: Beat frequency - 4.5GHz, number of harmonics - 10, tstab=100n

pnoise settings: pss beat freq - 4.5GHz, sweep type - relative, sweep range 100k to 2.5GHz, max sidebands -10, noise type-jitter 

are the above pss and pnoiose settings correct

I am getting the phase noise of -78dBc/Hz at 1MHz offset. the measurement of jitter jc gives 157fs 

for measuring jcc what  must the value of k.

Is the setting noise type-jitter correct, if it is wrong which one we have to choose(source, modulated).

please help

thank you 

satya

.

Parents

  • hai 

    thanks for your reply. 

    Objective is to measure the jitter of the oscillator. which one to choose, jc or jcc. if jcc what must be the value of k.

    reference freq=50MHz, Oscillator freq=5GHz

    from transient analysis i get the oscillator frquency as 5GHz, but from pss and pnoise it is 4.92GHz.

    the value of beat frquency chosen can be less than 5GHz.

    thanks 

    satya

Reply

  • hai 

    thanks for your reply. 

    Objective is to measure the jitter of the oscillator. which one to choose, jc or jcc. if jcc what must be the value of k.

    reference freq=50MHz, Oscillator freq=5GHz

    from transient analysis i get the oscillator frquency as 5GHz, but from pss and pnoise it is 4.92GHz.

    the value of beat frquency chosen can be less than 5GHz.

    thanks 

    satya

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