How to use .measure in HSpice?

[Fractional-N]

hspice rms

How can I use .measure command in HSpice to determine cutoff (-3db) and unity gain (0db) freqs
Can you explain the usage explicitly and clearly
HSpice help is so confusing

 

[heifu1747]

measure statement in ac analysis in hspice

?? it seems so hard

 

[Fractional-N]

hspice measure peak

thnx Mathuranathan, but u have just copied HSPices help here!
what I want is to measure a quantity when other quantity equals a special value, OK!
so
am I supposed to write as follows? in HSPice?

.MEASURE AC<-(this is to say we are using ac simulation) FIND unitygain<-(this is a variable that I wish "unity-gain-freq" be assigned to) WHEN VDB(Vout)=0<-(this is the circuits output voltage in dB)

Well as u probably guess I tried it, and it doesnt work.
anybody can tell me what should I do?
simply please, I am not so talented