[SOLVED] **error** inductor/voltage source loop found containing 0:vf defined in subckt

[deardeepa76]

Hi,

I am trying to simulate the circuit shown in attachment. I am getting this message in HSPICE

**error** inductor/voltage source loop found containing 0:vphibar defined in subckt 0

I have added 3 milliohm resistors to break the loop, but still I could not fix it. what is wrong with the circuit?
can anyone help me with this issue?

-Deepa

 

[erikl]

VPhi    Vdd Gnd  PULSE(0 5  0  5n 5n 90n 200n)  
VPhibar Vdd Gnd  PULSE(0 5 50n 5n 5n 90n 200n)

I suspect these 2 voltage sources are responsible (short circuit).

 

[deardeepa76]

Yes erikl, I understand that, but I have included 1milliohm resistor after all the voltage sources in the circuit.
VPhi is connected to Source of MNMOS_1 through RR1 and VPhibar is connected to source of MNMOS_2 through RR2.
I have read in forums that introducing a small shunt resistor will break the voltage source/inductor loop, but here why it doesn't work?

 

[erikl]

I guess Vdd is your positive supply node? So you still have 2 short-circuited voltage (pulse) sources VPhi & VPhibar in parallel between Vdd & Gnd.
I think you need to change the 3 voltage sources to

VVin    N_4 Gnd  DC 0 AC 1 0
VPhi    N_3 Gnd  PULSE(0 5  0  5n 5n 90n 200n)  
VPhibar N_5 Gnd  PULSE(0 5 50n 5n 5n 90n 200n)

... and remove the 3 resistors.

 

[deardeepa76]

Yes erikl, it worked thanks a lot