SIMULATION AND ITS IMPORTANCE IN THE VLSI DESIGN

It is a design validation tool to check circuit’s function and other parameters such as performances. These tools are available for all levels of design. Four types of simulation tools are:
1 CIRCUIT SIMULATION: - It performs a detailed analysis of voltages and currents in the circuit.
2 TIMING SIMULATION: - Simulates large circuits which are not possible by circuit simulations.
3 SWITCH SIMULATION: - Treats the transistors are ideal or semi-ideal switches.
4 GATE SIMULATION: - It uses the logic gate as the fundamental unit of simulation.

Simulation can be done at two levels:
1 Before the layout is complete.
2 After the completion of layout.
It checks hundreds of transistor on a computer but we have thousands of transistors in VLSI chip.

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