Title

Description

Idea by

This project implements a SPICE-like circuit simulator for linear circuits.

The simulator can be implemented in C/C++/Matlab or any other programming language. The simulator should support time-domain analysis, frequency-domain analysis and sensitivity analysis. The outputs should be displayed in graphical form. The input circuit file can have circuit elements such as resistance, inductance, capacitance, independent current/voltage source, voltage (current) dependent voltage (current) source and basic operational amplifier. The SPICE-like syntax can be followed e.g. R 1 0 0 0 20000 means a resistance of 20k between nodes 1 and 0. In the case of voltage (current) dependent voltage (current) source 4 nodes must be specified. For a one port element (e.g. R, C etc) the last two nodes should be ignored. The end of input file can be specified by a negative number (-1 etc.). Equations for a given circuit can be formulated using modified nodal analysis. A system of linear equations can be solved by LU decomposition and forward/backward substitution methods. For the reasons of accuracy and to avoid the "divide by zero" problem, full pivoting algorithm should be implemented. If you are using Matlab or similar mathematical package, built-in functions to perform the above matrix manipulations should not be used. If you choose to implement this project as part of your B.Tech. project, the project can be extended to include non-linear devices (diodes/transistors). Newton-Raphson method can be used to solve a system of non-linear equations. The time domain analysis of non-linear circuits will require iterations using one of the implicit integration methods (e.g. Euler Backward, Trapezoidal method etc.). Also the initial conditions should be included to reach the convergence in non-linear circuits. If you need more information and guideline about this project, you can contact me.

4th Year students can include the non-linear circuit elements to make the project more advanced (suitable for BTP).

Have Fun !!!

Tools Recommended:

Recommended Book: "Computer Methods for Circuit Analysis and Design", J. Vlach and K. Singhal, Chapman and Hall, Second Edition.

Software Tools: Any programming language (C/C++/Fortran etc.) compiler or any mathematical package (Matlab/Mathcad/Mathematica/Maple etc.)

The main aim is to make a small protected mode operating system that will run on a normal intel based Desktop PC and will be able to run and execute simple assembly programs. It should have a simple memory management and device management structure.

This type of tool will be very useful to test low level assembly programs with any levels of software.

Flat Assembler www.flatassembler.net
OS Development www.osdever.net

Tools Recommended:

MATLAB

C/C++

Also See recommended books in Network Analysis

The Aim of this Software would be to accept opamp Specifications, like:

• Open Loop Gain

• Small Signal Bandwidth

• Slew Rate

• Input Voltage Range

• Output Range

And using these specifications suggest a topology and the dimensions of transistors which would be able to realize the opamp. The Software should be made in such a way so that it is not difficult to add more topologies later to its library of topologies and thus allowing the software to grow.

Tools Recommended:

MATLAB

C/C++

Microsoft Excel

Also See recommended books in Analog Design