Resistor and Capacitor L/W Parameters in LVS Comparison

Introduction

In the design of VLSI circuits the situations occur very often when a single schematic device is implemented in the layout by the group of several devices connected in parallel or series. Such groups of devices must be reduced to a single device in the layout and the circuits must be compared in terms of the single devices taking into account their geometrical characteristics. In this article we introduce some methods of calculation and comparison of geometrical parameters of resistors and capacitors connected in parallel or series, when LVS verification is performed.

Resistor L/W parameters

Guardian LVS reduces the group of parallel resistors to a single resistor, if the Parallel merge option in Models Settings panel for resistors is on. All resistors in the group must have the same type, the same number of terminals and each terminal of a resistor must be connected to the same or swappable terminal of another resistor (see Figure 1). All optional (bulk) terminals of resistors must be connected to the same net.