icemc2008
Newbie level 5
Hello everyone,
I have a question about simulation jitter in ADS. for the first step, I dont use to eye diagram, I only want to simulation the output signal of a ring oscillator with/without noise on its power supply, and compare it with measurement.
From measurement, I got a statistal information about the period jitter, for example, I trigge the front edge of the signal, and measure the period, I got min, max, std. and a histogram distribution.
with ADS simulation, I do a transient simulation, and got the output signal. the question is : I dont sure about the function in ADS to extract the evoluation of the period.
from a example in ADS help :ClockWjitter (Voltage Source - Clock with Jitter)
I use the function cross() the extract the period, but when I plot the curve(for a ideal signal, without jitter), it seems to begin with 0 and need some time to arrive the stable value. Is there some other function, which could only got the stable value?
then use the histogram() or cross_hist() to plot the histogram distribution.
in the ADS help ClockWjitter (Voltage Source - Clock with Jitter), it use function below
period = cross(output_signal)
per2=period[1::sweep_size(period)-1] =====> what does it use for?
his=histogram(per1)
I try them in ADS and compare with my functions, I could not find the difference. does some one know the difference?
and when you do the simulation of jitter, do you have some better ideal or function for advise?
Thanks everyone, please give your opinion.
I have a question about simulation jitter in ADS. for the first step, I dont use to eye diagram, I only want to simulation the output signal of a ring oscillator with/without noise on its power supply, and compare it with measurement.
From measurement, I got a statistal information about the period jitter, for example, I trigge the front edge of the signal, and measure the period, I got min, max, std. and a histogram distribution.
with ADS simulation, I do a transient simulation, and got the output signal. the question is : I dont sure about the function in ADS to extract the evoluation of the period.
from a example in ADS help :ClockWjitter (Voltage Source - Clock with Jitter)
I use the function cross() the extract the period, but when I plot the curve(for a ideal signal, without jitter), it seems to begin with 0 and need some time to arrive the stable value. Is there some other function, which could only got the stable value?
then use the histogram() or cross_hist() to plot the histogram distribution.
in the ADS help ClockWjitter (Voltage Source - Clock with Jitter), it use function below
period = cross(output_signal)
per2=period[1::sweep_size(period)-1] =====> what does it use for?
his=histogram(per1)
I try them in ADS and compare with my functions, I could not find the difference. does some one know the difference?
and when you do the simulation of jitter, do you have some better ideal or function for advise?
Thanks everyone, please give your opinion.
