Two stage opamp simulation

[lijun_sun]

I simulate an amp with hspice and get the phase-frequency graph.But I was confused by the graph. When the phase nears 180 degree there is a break in the graph,why?



Who can help me?

 

[fxxjssc]

hi,
phase-frequency decrease 90o when encounter one pole. so 180 degree when two pole. 270 when three.
in Hspice, what make you confused just the way of expression. as what you see from the graph, after decrease 180 in phase, the phase continue to decrease.
may help you understanding

 

[Chethan]

I simulate an amp with hspice and get the phase-frequency graph.But I was confused by the graph. When the phase nears 180 degree there is a break in the graph,why?



Who can help me?

can u reduce the size of the jpg image and upload it again??
it costs 4 points for the user to open it....

 

[lijun_sun]

ok,thanks!