How to get the duty cycle of a frequency with Hspic?

[icpaopao]

How to get the duty cycle of a frequency with Hspic?

I want to get the duty cycle with the 'measure'.
How can I do ?

 

[RDRyan]

Maybe this can do:

.meas tran T1 when v(out)='0.5*v(vdd)' cross=1
.meas tran T2 when v(out)='0.5*v(vdd)' cross=2
.meas tran T3 when v(out)='0.5*v(vdd)' cross=3
.meas tran Duty param='(T2-T1)/(T3-T1)'

Ryan

 

[icpaopao]

Thank you.
But I have 300 cycles. And I wanna get the average.
Then , how to repeat these'measure's quickly?

 

[RDRyan]

It seems we should repeat it 300 times for 300 cycles. I think. but I have another solution for your case: I often use a wave display tool - CosmosScope do this work. there are many function in CosmosScope that can measure different parameters.

Ryan

 

[icpaopao]

I use the cosmosScope,too.
But I need to repeat this process for many corners,so I want to find a convinient way.
And I am in the same trouble of caculating the jitter.

Could you have any advices?
Thank you.

 

[RDRyan]

I am also faced the trouble. so far, I haven't found a convenient way. For different corners, I have to do the same thing.

Ryan