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Modeling of Diode Reverse Characteristics

Modeling of Diode Reverse Characteristics

In electronic circuits, reverse-biased diode configurations are critical for regulating voltage levels. Zener diodes exploit the reverse breakdown phenomenon and exhibit a controlled breakdown at a specific Zener voltage (VZ). They are designed to maintain a constant voltage across their terminals and are commonly used for voltage regulation in circuits.
When a reverse voltage applied to a Zener diode exceeds its breakdown voltage, the diode enters the breakdown region. At this point, the...

Schottky Barrier Diode

Schottky Barrier Diode

Schottky barrier diodes are specialized semiconductor devices characterized by their unique construction. This construction involves combining a metal layer with a moderately doped n-type semiconductor material. This combination leads to the formation of a Schottky barrier, a pivotal element that defines the diode's operational characteristics. The core functionality of Schottky barrier diodes is their capacity to allow current to flow in only one direction due to their distinctive...

Voltage Doubler Circuit

Voltage Doubler Circuit

A voltage doubler circuit integrates two main components: a clamping section and a rectifier section. The clamping section consists of a capacitor (C1) and a diode (D1), whereas the rectifier section is equipped with another diode (D2) and capacitor (C2). This circuit produces an output voltage with twice the amplitude of the sinusoidal input voltage.

The Ideal Diode

The Ideal Diode

A diode is a semiconductor device that allows current to flow in one direction only, making it a crucial component in electronic circuits for controlling the direction of current flow. An ideal diode is a simplified version of a real diode used to understand how diodes work in circuits. It possesses two terminals: the positive anode and the cathode, which is negative. When a positive voltage is applied to the anode relative to the cathode, the diode is in a forward-biased state, allowing...

Full wave rectifier

Full wave rectifier

A full-wave rectifier is a device that converts alternating current (AC) to direct current (DC) and is more efficient than its half-wave counterpart. It typically includes a center-tapped transformer, two diodes, and a load resistor. The secondary winding of the transformer is divided to provide two equal voltages of opposite polarities, which is the pivotal element of full-wave rectification.

Non-ohmic Devices

Non-ohmic Devices

In most substances, the current flow is proportional to the voltage applied to it. A simple relationship between the values of current, voltage, and resistance is known as Ohm's law. Nonohmic devices do not exhibit a linear relationship between voltage and current. One such device is the semiconducting circuit element known as a diode. A diode is a circuit device that allows current flow in only one direction.
Consider a simple circuit consisting of a battery, a diode, and a resistor. A...

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Related Experiment Video

Updated: Jun 29, 2025

Atomic Layer Deposition of Vanadium Dioxide and a Temperature-dependent Optical Model

Atomic Layer Deposition of Vanadium Dioxide and a Temperature-dependent Optical Model

Published on: May 23, 2018

Multifunctional metamaterial device based on VO₂ and the equivalent diode.

Zelong Wang, Xin Wang, Junlin Wang

|April 3, 2024

Summary

This summary is machine-generated.

This study presents a switchable multifunctional metamaterial device for terahertz (THz) applications. It achieves dual-band absorption and polarization conversion, offering a new strategy for miniaturized THz devices.

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Atomic Layer Deposition of Vanadium Dioxide and a Temperature-dependent Optical Model

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Published on: May 23, 2018

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Characterizing Dissipative Elastic Metamaterials Produced by Additive Manufacturing

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Published on: June 28, 2024

Area of Science:

Metamaterials
Terahertz (THz) Technology
Electromagnetics

Background:

Metamaterials offer unique electromagnetic properties.
Terahertz (THz) technology requires advanced devices for various applications.
Switchable and multifunctional devices are crucial for next-generation systems.

Purpose of the Study:

To propose a novel switchable multifunctional metamaterial device operating in the THz band.
To demonstrate dual-band absorption and polarization conversion functionalities.
To explore applications in electromagnetic stealth, radiometry, and sensing.

Main Methods:

Design and simulation of a metamaterial device incorporating an equivalent diode and vanadium dioxide (VO2).
Analysis of device performance under different diode states (ON/OFF) and VO2 phase transitions (insulating/conductive).
Investigation of absorption spectra and polarization conversion capabilities across THz frequencies.

Main Results:

The I side exhibits dual-band absorption at 1.975 and 4.345 THz (diode ON) and single-band absorption at 4.28 THz (diode OFF).
The II side achieves linear-to-linear (LTL) polarization conversion from 2.342-4.18 THz (VO2 insulating).
The II side realizes linear-to-circular (LTC) polarization conversion from 2.105-3.283 THz (VO2 conductive).

Conclusions:

The proposed device successfully integrates multiple functionalities within a single metamaterial structure.
It offers a new strategy for combining diverse functions in miniaturized THz devices.
The device shows significant potential for applications in electromagnetic stealth, intelligent systems, radiometers, and sensors.