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How to set the different options

Muffassir

 Hi all,

 

I want to simulate the inverter followed by inverter dc analysis as shown in the image attached inverter.png.

[url=http://images.elektroda.net/40_1332403987.png][img]images.elektroda.net/.../url] 

 

The circuit is from a IEEE paper. The author says that to simulate such circuits.......

 

It is based on performing a transient analysis, which starts with all the power supplies and circuit inputs set to zero. Thus, the initial condition for the floating-gate voltage provided to the simulator is zero. Afterwards, in the same transient analysis, power and inputs are set to their values. The stationary state reached provides the correct initial operation, which can be used for the rest of simulations.

I simulated the circuit using Vdd as vpulse(V1=0,V2=3.3, Period=120us, Delay=200ns, tr=tf=1u, Pulsewidth=75us)

Vin as triangular wave ( V1=0,V2=3.3, Period=100us, Delay=200ns, tr=tf=50us, Pulsewidth=0)

Vc as Pulse( V1=0,V2=2V, Period=100us, Delay=500ns, tr=tf=2u, Pulsewidth=50us)

for setting the power supplies.

W/L of both inverters are PMOS=6.5u/2u and NMOS=3u/2u.

The outputs i am getting after the simulation are shown in the image outinverter.png and expected outputs from IEEE paper are shown in the outexpected.png.

 [url=http://images.elektroda.net/86_1332404026.png][img]images.elektroda.net/.../url] 

[url=http://images.elektroda.net/21_1332404050.jpg][img]images.elektroda.net/.../url] 

The outputs for Vout1 and vout are not according to the exxpected. Also i am not able to get the DC transfer characteristics of the above circuit.I have even also set readns=spectre.fc file from trans analysis.

 On the basis of the statement by the author is there any thing i can set the options in trans/dc options so that i can get the output of DC characteristics.

 Any help is much appreciated.

 

Thanks

 

 

 

  •  Hi guys out there!!

    Issued in public interest!!

    I got it solved the isuuse of simulating the FGMOS inverter circuits...what you all need is to do is give the impulse input as triangular wave so that the capacitors gets the initial charge required.i.e the Floating gate is set to initial value.

     

    Most important guys when you want to simulate the FGMOS be sure to add capaacitors as i have shown above in the schematic circuits & be sure to put the edit and upadte the capacitors property form (click Q ) and set the initial condition=0.

     

    Hope this helps to the guys who are struggling to simulate FGMOS.

    if you need any help on this issue you can contact me on muffassir@gmail.com

     

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