Design and Simulation of Current Mirror Circuits

Abstract

A current Mirror is a circuit designed to copy a current through one active device by controlling the current in another active device of circuit, keeping the output current constant regardless of loading. The current being copied can be, and sometime is a varying signal current. Conceptually an ideal current mirror is simply an ideal inverting current amplifier that reverses the current direction as well or it is a current controlled current source (CCCS). The current mirror is used to provide bias current and active loads to circuits. For modern CMOS technologies with shorter channel lengths, smaller voltage gain and lower supply voltage impose many constraints on the performance and circuit structures of the current mirrors. Current mirror is the core structure for almost all analog and mixed mode circuits determine the performance of analog structures, which largely depends on their characteristics. For high performance analog circuit application, the performance of the current mirror. An efficient implementation of a CMOS current mirror suitable for low voltage application and achieve low input resistance, high accuracy and high output resistance. In this report advance current mirror, like wide swing is characterized, simulated and analyzed with different aspects and these topologies are also compared with basic current mirror, like simple and cascode current mirror. To support the circuit design, simulation and layout design, TSMC 0.18 micro meter CMOS technology is used here. Whole work is carried out by Eldo Spice Design Architect and IC Station (Mentor Graphics)