Please help! RFDE simulation error

Hi All,

I am using rfde to simulate a circuit with transformers and self designed inductors. However, when I'm doing post layout simulation using ADSsim of RFDE, I got a warning which says "Warning detected by hpeesofsim in Bsource `I1.I77_esdndsx1.grtlp' during DC analysis `Tran1'.
    SYM warning: Zero to a non-positive exponent." Then the simulation goes to several iteration and stuck there forever.

I noticed that the "esdndsx1" in the warning comes from the pad, but other students in my lab is using the same pad, and also runing ADSsim, but see no warning or error like this. The whole log is shown below. Anyone please help me? Thanks a lot.

hpeesofsim (*) 410.shp Mar 17 2014 (64-bit built: 03/17/14 19:07:27)
Copyright Agilent Technologies, 1989-2014.
Processing VAMS source '/byunlab/ics/pdk/ibm130nm/IBM_PDK/cmrf8sf/V1.8.0.4DM/Spectre/models/coupled_cpw.va'
 compiled source cache is valid
Processing VAMS source '/byunlab/ics/pdk/ibm130nm/IBM_PDK/cmrf8sf/V1.8.0.4DM/Spectre/models/hacap.va'
 compiled source cache is valid
Processing VAMS source '/byunlab/ics/pdk/ibm130nm/IBM_PDK/cmrf8sf/V1.8.0.4DM/Spectre/models/mvcap.va'
 compiled source cache is valid
Processing VAMS source '/byunlab/ics/pdk/ibm130nm/IBM_PDK/cmrf8sf/V1.8.0.4DM/Spectre/models/esd_modules.va'
 compiled source cache is valid
Processing VAMS source '/byunlab/ics/pdk/ibm130nm/IBM_PDK/cmrf8sf/V1.8.0.4DM/Spectre/models/esdnsh_spe.va'
 compiled source cache is valid
Processing VAMS source '/byunlab/ics/pdk/ibm130nm/IBM_PDK/cmrf8sf/V1.8.0.4DM/Spectre/models/gsnap.va'
 compiled source cache is valid
Processing VAMS source '/byunlab/ics/pdk/ibm130nm/IBM_PDK/cmrf8sf/V1.8.0.4DM/Spectre/models/single_cpw.va'
 compiled source cache is valid
Processing VAMS source '/byunlab/ics/project/ibm130nm/xiaoyanw/rfw_i130/beh_prbs_rand_jit/veriloga/veriloga.va'
 compiled source cache is valid

Warning detected by hpeesofsim during netlist parsing.
    Skipping instance `dgnfet.<ConditionalCircuit>.vds_check' of type `assert',
    In file `/byunlab/ics/project/ibm130nm/yuey/models/dgnfet.scs' at, or just before, line 219.

Warning detected by hpeesofsim during netlist parsing.
    Skipping instance `dgnfet.<ConditionalCircuit>.vgs_check' of type `assert',
    In file `/byunlab/ics/project/ibm130nm/yuey/models/dgnfet.scs' at, or just before, line 220.

Warning detected by hpeesofsim during netlist parsing.
    Skipping instance `dgnfet.<ConditionalCircuit>.vgd_check' of type `assert',
    In file `/byunlab/ics/project/ibm130nm/yuey/models/dgnfet.scs' at, or just before, line 221.

Warning detected by hpeesofsim during netlist parsing.
    Skipping instance `dgnfet.<ConditionalCircuit>.vgb_check' of type `assert',
    In file `/byunlab/ics/project/ibm130nm/yuey/models/dgnfet.scs' at, or just before, line 222.

Warning detected by hpeesofsim during netlist parsing.
    Skipping instance `dgnfet.<ConditionalCircuit>.vbs_check' of type `assert',
    In file `/byunlab/ics/project/ibm130nm/yuey/models/dgnfet.scs' at, or just before, line 223.

Warning detected by hpeesofsim during netlist parsing.
    Skipping instance `dgnfet.<ConditionalCircuit>.vbs_chkfwd' of type `assert',
    In file `/byunlab/ics/project/ibm130nm/yuey/models/dgnfet.scs' at, or just before, line 224.

Warning detected by hpeesofsim during netlist parsing.
    Skipping instance `dgnfet.<ConditionalCircuit>.vbd_check' of type `assert',
    In file `/byunlab/ics/project/ibm130nm/yuey/models/dgnfet.scs' at, or just before, line 225.

Warning detected by hpeesofsim during netlist parsing.
    Skipping instance `dgnfet.<ConditionalCircuit>.vbd_chkfwd' of type `assert',
    In file `/byunlab/ics/project/ibm130nm/yuey/models/dgnfet.scs' at, or just before, line 227.

Warning detected by hpeesofsim during netlist parsing.
    Skipping instance `dgnfetpsp.<ConditionalCircuit>.vds_check' of type `assert',
    In file `/byunlab/ics/project/ibm130nm/yuey/models/dgnfet_psp.scs' at, or just before, line 209.

Warning detected by hpeesofsim during netlist parsing.
    Skipping instance `dgnfetpsp.<ConditionalCircuit>.vgs_check' of type `assert',
    In file `/byunlab/ics/project/ibm130nm/yuey/models/dgnfet_psp.scs' at, or just before, line 210.

NXP SiMKit (ver. 4.1 (4.1))

Analog module platform compile:
    [3] amswork.mosvarcap (valid object cache, no platform compile required )
    [4] amswork.It2_monitor (valid object cache, no platform compile required )
    [9] amswork.beh_prbs_rand_jit (valid object cache, no platform compile required )
    Analog module design library exists, no link required.
Done with exporting devices.

Warning detected by hpeesofsim in topology check during circuit set up.
    Number of nodes with no DC path to ground (topology corrected): 393


COMPONENT : I6.Sport1
    Characterizing to 60 GHz
    Use an adaptive sample spacing of 234.4 MHz.

COMPONENT : I7.Sport1
    Characterizing to 40 GHz
    Use an adaptive sample spacing of 625 MHz.

Warning detected by hpeesofsim during TRAN analysis `Tran1'.
    COMPONENT : `I7.Sport1'
       DC data are provided but the imaginary parts are not zero.

COMPONENT : I12.Sport1
    Characterizing to 40 GHz
    Use an adaptive sample spacing of 625 MHz.

Warning detected by hpeesofsim during TRAN analysis `Tran1'.
    COMPONENT : `I12.Sport1'
       DC data are provided but the imaginary parts are not zero.

COMPONENT : I5.Sport1
    Characterizing to 60 GHz
    Use an adaptive sample spacing of 1.875 GHz.

COMPONENT : I9.I57.Sport1
    Characterizing to 40 GHz
    Use an adaptive sample spacing of 625 MHz.

COMPONENT : I9.I55.Sport1
    Characterizing to 40 GHz
    Use an adaptive sample spacing of 625 MHz.

COMPONENT : I9.I9.Sport1
    Characterizing to 40 GHz
    Use an adaptive sample spacing of 625 MHz.

COMPONENT : I9.I25.Sport1
    Characterizing to 40 GHz
    Use an adaptive sample spacing of 625 MHz.

COMPONENT : I9.I29.Sport1
    Characterizing to 40 GHz
    Use an adaptive sample spacing of 625 MHz.

COMPONENT : I9.I45.Sport1
    Characterizing to 40 GHz
    Use an adaptive sample spacing of 625 MHz.

COMPONENT : I9.I51.Sport1
    Characterizing to 40 GHz
    Use an adaptive sample spacing of 625 MHz.

COMPONENT : I9.I49.Sport1
    Characterizing to 40 GHz
    Use an adaptive sample spacing of 625 MHz.

COMPONENT : I9.I52.Sport1
    Characterizing to 40 GHz
    Use an adaptive sample spacing of 625 MHz.

COMPONENT : I9.I0.Sport1
    Characterizing to 40 GHz
    Use an adaptive sample spacing of 625 MHz.

Warning detected by hpeesofsim in Bsource `I1.I77_esdndsx1.grtlp' during DC analysis `Tran1'.
    SYM warning: Zero to a non-positive exponent.


TRAN Tran1[1] <input.ckt>   time=(0 s->40 ns)

  iter = 1   RHS I= 3.096e-05 V= 3.369e-08 k fail RHS V[I1.I66_I2_mixer_CM0.l1.i]= 1.250e-06 (1.2x)  dV= 8.536e-13 dI= 6.242e-08
  iter = 2   RHS I= 3.068e-07 V= 7.094e-14
  iter = 1   RHS I= 3.787e-07 V= 1.097e-13  dV= 1.394e-15 dI= 4.375e-07
  iter = 2   RHS I= 1.383e-07 V= 5.971e-14
  iter = 1   RHS I= 4.292e-07 V= 1.103e-13  dV= 3.770e-15 dI= 5.926e-07
  iter = 2   RHS I= 5.110e-08 V= 1.705e-14
  iter = 1   RHS I= 2.210e-07 V= 5.049e-14  dV= 4.965e-15 dI= 7.255e-07
  iter = 2   RHS I= 1.677e-08 V= 6.642e-15
  iter = 1   RHS I= 2.117e-05 V= 1.305e-07 k fail RHS I[net024]= 6.305e-05 (3.5x)  dV= 5.520e-13 dI= 1.364e-07
  iter = 2   RHS I= 2.927e-07 V= 9.308e-13 k fail RHS I[I1.I2_I4_I5_avD2_21.g]= 1.740e-09 (5.5x)  dV= 4.492e-16 dI= 3.054e-08
  iter = 3   RHS I= 2.942e-07 V= 6.967e-13
  iter = 1   RHS I= 5.452e-07 V= 1.196e-12  dV= 3.034e-15 dI= 8.682e-07
  iter = 2   RHS I= 1.628e-07 V= 4.637e-14
  iter = 1   RHS I= 4.461e-07 V= 1.022e-12  dV= 3.624e-15 dI= 1.141e-06
  iter = 2   RHS I= 4.368e-08 V= 5.110e-14
  iter = 1   RHS I= 3.169e-07 V= 9.313e-14  dV= 5.349e-15 dI= 1.184e-06
  iter = 2   RHS I= 1.759e-08 V= 2.037e-14
  iter = 1   RHS I= 2.991e-05 V= 2.326e-07 k fail RHS I[rftx1_p]= 1.695e-05 (1.8x)  dV= 8.654e-13 dI= 6.790e-05
  iter = 2   RHS I= 2.231e-07 V= 9.450e-13 k fail RHS I[I1.I2_I3_I0_avD2_63.g]= 8.165e-09 (2.3x)  dV= 4.137e-16 dI= 3.662e-08
  iter = 3   RHS I= 3.305e-07 V= 7.094e-13
  iter = 1   RHS I= 5.075e-05 V= 3.666e-12  dV= 6.019e-13 dI= 3.857e-04
  iter = 2   RHS I= 1.204e-07 V= 3.964e-13
  iter = 1   RHS I= 1.103e-04 V= 9.182e-13  dV= 2.855e-15 dI= 5.432e-04
  iter = 2   RHS I= 4.871e-08 V= 5.905e-14
  iter = 1   RHS I= 1.103e-04 V= 4.471e-13  dV= 4.726e-15 dI= 5.432e-04
  iter = 2   RHS I= 1.476e-08 V= 2.496e-14
  iter = 1   RHS I= 2.988e-05 V= 1.943e-07 k fail RHS I[rftx1_p]= 2.253e-05 (2.4x)  dV= 1.064e-12 dI= 6.127e-05
  iter = 2   RHS I= 1.766e-07 V= 2.670e-12 k fail RHS I[I1.I2_I4_I0_avD2_63.g]= 1.048e-08 (2.9x)  dV= 4.637e-16 dI= 2.617e-08
  iter = 3   RHS I= 2.567e-07 V= 2.516e-12
  iter = 1   RHS I= 3.733e-05 V= 6.579e-12  dV= 1.068e-12 dI= 3.064e-04
  iter = 2   RHS I= 1.162e-07 V= 1.107e-12
  iter = 1   RHS I= 9.954e-05 V= 3.936e-12  dV= 2.694e-15 dI= 4.902e-04
  iter = 2   RHS I= 5.175e-08 V= 6.604e-13
  iter = 1   RHS I= 9.953e-05 V= 1.432e-12  dV= 5.076e-15 dI= 4.902e-04
  iter = 2   RHS I= 1.502e-08 V= 3.902e-13
  iter = 1   RHS I= 3.617e-05 V= 1.564e-06 k fail RHS I[net024]= 2.250e-04 (13x)  dV= 1.351e-12 dI= 1.681e-08
  iter = 2   RHS I= 1.864e-07 V= 2.688e-12 k fail RHS I[I1.I2_I4_I5_avD2_21.g]= 7.715e-10 (2.4x)  dV= 3.799e-16 dI= 2.284e-08
  iter = 3   RHS I= 1.467e-07 V= 3.264e-13
  iter = 1   RHS I= 3.870e-07 V= 6.126e-12  dV= 1.255e-15 dI= 1.638e-07
  iter = 2   RHS I= 1.223e-07 V= 9.046e-13
  iter = 1   RHS I= 2.652e-07 V= 8.412e-13  dV= 2.716e-15 dI= 3.314e-07
  iter = 2   RHS I= 4.515e-08 V= 1.303e-13