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LC Circuits01:21

LC Circuits

2.5K
An LC circuit consists of an inductor and a capacitor, either in series or parallel. Consider a charged capacitor connected with an inductor in series. Before the switch is closed, all the energy of the circuit is stored in the electric field of the capacitor. When the switch is closed, the capacitor begins to discharge, producing a current in the circuit. The current, in turn, creates a magnetic field in the inductor. Because of the induced emf in the inductor, the current cannot change...
2.5K
Semiconductors01:22

Semiconductors

701
There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
Metals such as copper (Cu), zinc (Zn), or lead (Pb) have low resistivity and feature conduction bands that are either not fully occupied or overlap with the valence band, making a bandgap non-existent. This allows electrons in the highest energy levels of the valence band to easily transition to the conduction band upon gaining...
701
Schottky Barrier Diode01:27

Schottky Barrier Diode

349
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...
349
The Ideal Diode01:15

The Ideal Diode

820
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...
820
Diode: Forward bias01:20

Diode: Forward bias

1.0K
In semiconductor devices, diodes play a crucial role in directing current flow, and its operation is primarily categorized into forward bias and reverse bias. A diode is said to be forward-biased when its p-type region is connected to the positive terminal of a battery and its n-type region is linked to the negative terminal. This configuration reduces the potential barrier within the diode, allowing current to flow easily from the p to the n-type region.
The behavior of a diode in forward bias...
1.0K
Diode: Reverse bias01:14

Diode: Reverse bias

726
A diode is reverse-biased when the positive terminal of an external voltage source is connected to the n-type material and the negative terminal to the p-type material. This configuration opposes the natural direction of current flow through the diode, effectively increasing the width of the depletion region and the barrier potential. The reverse bias condition produces a minimal leakage current, primarily due to minority charge carriers. This leakage becomes significant when the reverse...
726

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Related Experiment Video

Updated: Jul 1, 2025

Laser-induced Forward Transfer for Flip-chip Packaging of Single Dies
08:21

Laser-induced Forward Transfer for Flip-chip Packaging of Single Dies

Published on: March 20, 2015

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Laser diode driver on a programmable system on a chip.

Milena Micic, Petar Atanasijevic, Pedja Mihailovic

    The Review of Scientific Instruments
    |March 5, 2024
    PubMed
    Summary
    This summary is machine-generated.

    A programmable system on a chip offers a versatile laser diode (LD) driver with precise temperature control. This solution provides stable performance and overshoot protection, serving as an alternative to dedicated devices.

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    Area of Science:

    • Electronics
    • Photonics
    • Control Systems

    Background:

    • Dedicated laser diode (LD) drivers often lack flexibility and advanced control features.
    • Integrating control and driver functions onto a single chip offers potential for miniaturization and cost reduction.

    Purpose of the Study:

    • To propose and demonstrate a comprehensive laser diode driver with integrated temperature control using a programmable system on a chip (SoC).
    • To offer a flexible and high-performance alternative to conventional, dedicated LD driver devices.

    Main Methods:

    • A digital proportional-integral-derivative (PID) controller was implemented on an SoC for precise LD temperature regulation.
    • Light-current characteristics and frequency response were measured using an external photodiode and an integrated transimpedance amplifier.
    • Digital implementation of laser diode overshoot protection with soft-start functionality was achieved.

    Main Results:

    • Demonstrated temperature stability of 0.084% and a bandwidth of 2 kHz.
    • Achieved a full-scale current error of 0.11%.
    • Successfully implemented digital overshoot protection for enhanced device longevity.

    Conclusions:

    • The proposed SoC-based LD driver provides a stable, accurate, and flexible solution for laser diode control.
    • The design is adaptable for various laser diode requirements, including the demonstrated 3W infrared LD.
    • This approach presents a viable alternative to specialized, single-function driver ICs.