How to plot Butterfly curves for NOISE MARGIN Analysis in CNTFET based Quaternary Logic Circuits using Synopsis Hspice ?

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Ahmad Al Khraisat

To plot Butterfly curves for noise margin analysis in CNTFET based Quaternary Logic Circuits using Synopsis Hspice, you can follow these steps:

Create a netlist for your circuit in Synopsis Hspice. This can be done using a text editor or using the built-in schematic capture tool.

Define the appropriate CNTFET models and parameters in the netlist. You will need to include models for both the n-type and p-type CNTFETs.

Specify the input signals for your circuit in the netlist, including the voltage levels and transition times.

Set up a DC sweep analysis for the input signals to obtain the transfer characteristics of the circuit.

Run the simulation and obtain the transfer characteristics for your circuit.

Use the transfer characteristics to plot the Butterfly curves for noise margin analysis. The Butterfly curves show the regions of the input space where the circuit output is either high or low, and can be used to determine the noise margins of the circuit.

To plot the Butterfly curves, you can use a data analysis tool such as MATLAB or Python. Import the transfer characteristics data, and then use the data to create a contour plot of the circuit output. The contour plot will show the regions of the input space where the circuit output is high or low.

Overlay the contour plot with the input voltage levels to obtain the Butterfly curves. The intersection points between the input voltage levels and the contour plot will indicate the noise margins of the circuit.

These are the general steps for plotting Butterfly curves for noise margin analysis in CNTFET based Quaternary Logic Circuits using Synopsis Hspice. However, the specific steps may vary depending on the details of your circuit and simulation setup. It is recommended to consult the Synopsis Hspice user manual and/or seek guidance from a qualified expert in the field for further assistance.

To plot Butterfly curves for Noise Margin Analysis in CNTFET based Quaternary Logic Circuits using Synopsis Hspice, you can follow these general steps:

Create a netlist file for the circuit design in Hspice.

Define the noise margins and the voltage transfer characteristic of the circuit in the netlist file.

Specify the parameters for the circuit components, such as the threshold voltage, mobility, and gate oxide thickness.

Run the simulation to obtain the output data file.

Use a script or a tool to extract the noise margin data from the output file.

Plot the Butterfly curves using the extracted data.

There are some tools available that can help you automate this process, such as the Cadence Design Systems' Virtuoso Schematic Editor, which has built-in noise margin analysis tools. Alternatively, you can use MATLAB or Python to write a script to extract the noise margin data and plot the curves.

The exact steps may vary depending on your specific circuit design and the version of Hspice you are using, so it is recommended to refer to the Hspice user manual or contact the Hspice support team for more specific guidance.

Ajay Rupani

Thank you sir.