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How to measure the min_pulse_width for clock pin?

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Jerry Yau

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min_pulse_width

Hi ALL,
My problen just like the title and the spice fragment is listed below:

.PARAM TR=0.001N
.PARAM TX=5n
.PARAM HI=4.5V
.PARAM LO=0V

VCK CK VSS PULSE LO HI TD TR TR 'TX-TR' TP
.MEAS VO1 FIND PAR('V(Q)/(HI-LO)') AT='0.9*TP+TD'

Yau see the spice stimuli. I put a pulse on clock pin named "CK" and measure the output valuse on output pin named "Q". The parameter TR control the slew of clock. Do you think I must use very very short time for TR?
Or what is the correct method I should use?

Thanks.
 

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