ac and pz discrepancies

Hi,

I have a simple 2-stage OTA (without any compensation) and again getting results which absolutely do not make any sense.

pz analysis tells me:

****************
PZ Analysis `pz'
****************
DC simulation time: CPU = 0 s, elapsed = 679.016 us.
                      Poles (Hz)

           Real                       Imaginary                 Qfactor

   1   -3.67643e+09                  0.00000e+00              5.00000e-01
   2   -1.47901e+11                  0.00000e+00              5.00000e-01
   3   -1.62910e+11                  0.00000e+00              5.00000e-01
   4   -3.44741e+11                  0.00000e+00              5.00000e-01

                      Zeros (Hz)
                      at V(vop,vom)/V3

           Real                       Imaginary                 Qfactor

   1    5.66921e+10                  0.00000e+00              -5.00000e-01
   2   -1.52018e+11                  0.00000e+00              5.00000e-01

Constant factor =  8.36594e+25

DC gain =  5.98046e+02

This is result of ac analysis (with the points from pz annotated):

Can this really be? This looks perfectly inconsistent to me. How can there only be one dominant pole which is above all much too high?

Based on hand calculations using values from dc op analysis (gds, Cdd and Cgg) I get the pole from the first stage as 1.054GHz, from the second stage as 990.2GHz.

I tried tweaking options for pz analysis but there are not really any useful options (like accuracy).

Thank you!

itos