# Problem of Convergence in simulating a model using Cadence Orcad 16.6 Pspice software?

I have a simple problem in simulating my circuit. First I will post all the details, Schismatic and netlist, then I will talk about the error and its options. I am using Cadence Orcad 16.6 Pspice and simulating a simple circuit the schematic along with simulation setting is given below.

The schamtic is very simple. I am giving input sine wave to my device and it has two output ports. The first is "N". Which I modeled using a voltage controlled voltage source. Before Going further, I will upload the netlist file I have written and integrated with the circuit.

.SUBCKT mem cap n vg
.PARAM p1=1, p2=-2, p3=3, p4=4,
+ epsilon0=8.85e-12, d_mos=0.65e-9, epsilon_mos={5*epsilon0},
+ d_g=30e-9, epsilon_g={19*epsilon0}, vt=-1, e=1.6e-19,
+ u=30, h=1.05e-34, weight=0.70,c_g={epsilon_g/d_g}, c_mos={epsilon_mos/d_mos},
+ c_t={1/((1/c_g)+(1/c_mos))},

.PARAM n_initial={((c_g*(-vt))/e)*0.0001},

En n 0 VALUE={(n_initial)}
.ENDS memcapacitor


Now the netlist is really simple...There is the parameter "n_initial" the value of which is calculated on the basis of previous parameters.When I calculated it value, It is equal to in the order 10^12 . Now I just want to output this n_initial value at the output node "n". This is constant value of the order 10^12 and it is not dependent on any input voltage .Its just a simple constant value calculated based on the previous parameters.

Issue: When I simulate this code, I get error given in the pic below, i.e Convergence issue in transient analysis.

I used almost all the techniques used in the file attached, i.e GMIN stepping and simulation option setting , change in number of iterations etc. But couldn,t solve the issue. Option: Then I changed the value of n_initial and reduced it to by using larger vale of "e" which is in the denominator. I used e value in the power of 10^-12 instead of 10^-19 and it worked. Conclusion: I concluded that problem is in the n_initial parameter value. If I increase this value and assign it to some node, It gives me error . When I reduce its value, It works just fine. Kindly give me suggestions. Thanks in advance. Note : if you need any other info, I will provide it happily. I can send all my file to anyone who will help me solving this problem.