How to use .measure in HSpice?

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Fractional-N

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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
 

measure statement in ac analysis in hspice

?? it seems so hard
 

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
 

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