hspice 极零点分析出现warning

Chaos_Green · 发表于 2011-5-27 10:07:26

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****** pole/zero analysis
**warning** underflow 1 time(s) in pole/zero analysis
**warning** underflow 1 time(s) in pole/zero analysis
**warning** underflow 1 time(s) in pole/zero analysis
**warning** underflow 1 time(s) in pole/zero analysis
.............
input =  0:vin1       output = v(6)

   poles (rad/sec)                poles ( hertz)
real          imag          real          imag
-4.77573x    0.             -760.081k    0.
-468.830x    0.             -74.6166x    0.
-492.670x    0.             -78.4108x    0.
-8.63344g    0.             -1.37405g    0.
-14.3726g    0.             -2.28748g    0.

   zeros (rad/sec)                zeros ( hertz)
real          imag          real          imag
-503.296x    -588.089k    -80.1021x    -93.5973k
-8.08488g    446.764k       -1.28675g    71.1047k
-81.1766g    58.4049g       -12.9197g    9.29542g
-81.1805g    -58.4014g    -12.9203g    -9.29488g
198.490g       0.             31.5906g       0.

  ***** constant factor = 163.465n

这些 warning 是什么意思？打印的极零点的值还准不准确？

yearslater · 发表于 2011-9-13 19:28:42

我也遇到了啊
而且这个复数极零点怎么出现啦。。。折叠共源共栅OTA的
   poles (rad/sec)                poles ( hertz)
**********************************************************************
real          imag          real          imag
  -12.4336x       0.          -1.9789x       0.
-3.9217g       -3.9342g    -624.1544x    -626.1489x
-3.9217g       3.9342g    -624.1544x    626.1489x
-7.9060g       0.          -1.2583g       0.
  -11.9800g       0.          -1.9067g       0.
  -12.4184g       0.          -1.9765g       0.
  -16.3111g       0.          -2.5960g       0.
node=vid    real= -3.8509E-16 imaginary=  1.3490E-16
**warning** underflow 1 time(s) in pole/zero analysis
   zeros (rad/sec)                zeros ( hertz)
**********************************************************************
real          imag          real          imag
-3.8427g       6.8541g    -611.5911x       1.0909g
-3.8427g       -6.8541g    -611.5911x       -1.0909g
-7.5648g       0.          -1.2040g       0.
  -11.9473g       0.          -1.9015g       0.
  -16.3085g       0.          -2.5956g       0.
  236.1106g       0.          37.5782g       0.