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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

  • Dear satya

    > are the above pss and pnoiose settings correct

    What is your objective? Why is your beat frequency 4.5 GHz when the oscillator frequency is 5 GHz?

    > for measuring jcc what  must the value of k.

    Jcc is the cycle to cycle jitter. This value is dependent on the number of cycles of the output signal over which it is measured. Hence, one must specify the number of cycles to measure Jcc. 

    I am sorry for my vague answers and additional questions, but I am not clear what your actual simulation objective is and your expected result.

    Shawn

Reply

  • Dear satya

    > are the above pss and pnoiose settings correct

    What is your objective? Why is your beat frequency 4.5 GHz when the oscillator frequency is 5 GHz?

    > for measuring jcc what  must the value of k.

    Jcc is the cycle to cycle jitter. This value is dependent on the number of cycles of the output signal over which it is measured. Hence, one must specify the number of cycles to measure Jcc. 

    I am sorry for my vague answers and additional questions, but I am not clear what your actual simulation objective is and your expected result.

    Shawn

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