question about Hspice

hi all,

when I check the phase margin after ac analysis of amp, if the pm below -180 degree, it jumped to +180, how can I make it shown from 0 to -360 degree?

thanks.

You just need to specify the option UNWRAP in the .AC statement.

http://www.ece.cmu.edu/~ee762/hspice...2001_2-78.html