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Lecture

Current Mirrors: Design and Analysis

In course

EE-320: Analog IC design

Introduction to the design of analog CMOS integrated circuits at the transistor level. Understanding and design of basic structures. ...

Description

This lecture covers the design and analysis of current mirrors, focusing on topics such as diff pair mismatch, CMRR, channel length modulation, and cascode current mirrors. It also discusses sizing issues and the use of unit transistors in current mirror circuits.

Instructor

Mahsa Shoaran

Official source

Ontological neighbourhood

Computer engineering

Hardware engineering: Microprocessors

Related concepts (32)

Transistor count

The transistor count is the number of transistors in an electronic device (typically on a single substrate or "chip"). It is the most common measure of integrated circuit complexity (although the majority of transistors in modern microprocessors are contained in the cache memories, which consist mostly of the same memory cell circuits replicated many times). The rate at which MOS transistor counts have increased generally follows Moore's law, which observed that the transistor count doubles approximately every two years.

Current mirror

A current mirror is a circuit designed to copy a current through one active device by controlling the current in another active device of a circuit, keeping the output current constant regardless of loading. The current being "copied" can be, and sometimes 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 can consist of a current-controlled current source (CCCS).

Integrated circuit

An integrated circuit or monolithic integrated circuit (also referred to as an IC, a chip, or a microchip) is a set of electronic circuits on one small flat piece (or "chip") of semiconductor material, usually silicon. Large numbers of miniaturized transistors and other electronic components are integrated together on the chip. This results in circuits that are orders of magnitude smaller, faster, and less expensive than those constructed of discrete components, allowing a large transistor count.

Transistor–transistor logic

Transistor–transistor logic (TTL) is a logic family built from bipolar junction transistors. Its name signifies that transistors perform both the logic function (the first "transistor") and the amplifying function (the second "transistor"), as opposed to earlier resistor–transistor logic (RTL) and diode–transistor logic (DTL). TTL integrated circuits (ICs) were widely used in applications such as computers, industrial controls, test equipment and instrumentation, consumer electronics, and synthesizers.

Current source

A current source is an electronic circuit that delivers or absorbs an electric current which is independent of the voltage across it. A current source is the dual of a voltage source. The term current sink is sometimes used for sources fed from a negative voltage supply. Figure 1 shows the schematic symbol for an ideal current source driving a resistive load. There are two types. An independent current source (or sink) delivers a constant current. A dependent current source delivers a current which is proportional to some other voltage or current in the circuit.

Related lectures (34)

Analog CMOS Integrated Circuits: Fundamentals

Covers the fundamentals of analog CMOS integrated circuits, emphasizing transistor-level design principles and the historical impact of CMOS technology.

Integrated Circuits: Evolution and Fabrication

Explores the evolution of integrated circuits, from transistors to CMOS technology, highlighting key historical milestones.

Techno-Scientific Promises: Moore's Law

Delves into the evolution and potential limits of Moore's Law, analyzing its impact on the semiconductor industry and technological innovation.

Voltage References: Zener Diode vs Band-Gap MOOC: Electronics II

Explains voltage references using Zener diodes and band-gap circuits, covering polarization methods, thermal stability, and overall negative reaction.

Current Mirrors: Applications and Design Considerations