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Related Concept Videos

Phasor Arithmetics01:13

Phasor Arithmetics

Phasors and their corresponding sinusoids are interrelated, offering unique insights into the behavior of alternating current (AC) circuits. One way to understand this relationship is through the operations of differentiation and integration in both the time and phasor domains.
When the derivative of a sinusoid is taken in the time domain, it transforms into its corresponding phasor multiplied by j-omega (jω) in the phasor domain, where j is the imaginary unit, and ω is the angular frequency.
Design Example: Capacitance Multiplier Circuit01:20

Design Example: Capacitance Multiplier Circuit

In integrated circuit technology, a capacitance multiplier is often utilized to produce a larger capacitance value when a small physical capacitance falls short. This is achieved by a circuit that multiplies capacitance values by a factor of up to 1000, such that a 10-pF capacitor can replicate the performance of a 100-nF capacitor.
The circuit illustrated in Figure 1 below incorporates two op-amps, with the first operating as a voltage follower and the second acting as an inverting amplifier.
Synthetic Disvision of Polynomials01:28

Synthetic Disvision of Polynomials

Synthetic division is an efficient algorithmic approach for dividing a polynomial by a linear binomial of the form x - c, where c is a real number. This method is helpful due to its streamlined process, which avoids the more cumbersome steps involved in the traditional long division of polynomials. It simplifies computation and serves as a practical tool for evaluating polynomials and identifying their factors.To perform synthetic division, one begins by listing the coefficients of the...
Generation of Three-Phase Voltage01:21

Generation of Three-Phase Voltage

A three-phase AC generator has a rotor with a rotating magnet placed within the stator mounted with the stationary three-phase winding to generate three-phase voltages via mutual induction. These windings are evenly distributed around the inner circumference of the stator and are arranged 120 electrical degrees apart. Three-phase stator windings consist of three separate coils or groups of coils, known as phases, each connected in Y (star) configuration or Delta configuration.
As the rotor...
Group Polarization01:01

Group Polarization

Group polarization is the strengthening of an original group attitude following the discussion of views within a group (Teger & Pruitt, 1967). That is, if a group initially favors a viewpoint, after discussion the group consensus is likely a stronger endorsement of the viewpoint. Conversely, if the group was initially opposed to a viewpoint, group discussion would likely lead to stronger opposition.
Block Diagram Reduction01:22

Block Diagram Reduction

The process of deriving the transfer function of a control system often involves reducing its block diagram to a single block. This simplification can be achieved through a series of strategic operations, including relocating branch points and comparators. These operations preserve the overall function of the system while allowing for easier manipulation and combination of blocks.
The first step in this process is the identification and relocation of a branch point. A branch point, where a...

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Updated: Jun 9, 2026

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
07:56

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

Published on: September 5, 2019

Polarization-encoded optical shadow-casting arithmetic-logic-unit design: separate and simultaneous output

J U Ahmed, A A Awwal

    Applied Optics
    |August 25, 2010
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a novel memory-efficient dual cell and a multi-output parallel arithmetic logic unit using optical shadow-casting. These designs enhance computational efficiency through advanced optical encoding techniques.

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    Published on: February 6, 2014

    Area of Science:

    • Computer Science
    • Optical Engineering
    • Electrical Engineering

    Background:

    • Traditional arithmetic logic units (ALUs) face limitations in memory efficiency and parallel processing capabilities.
    • Optical computing offers potential for high-speed and low-power computation.

    Purpose of the Study:

    • To design a memory-efficient dual cell using optical methods.
    • To develop a multi-output parallel arithmetic logic unit (ALU) with optical implementation.
    • To present algorithms for pattern identification, input encoding, and output masking in optical computing.

    Main Methods:

    • A polarization-encoded optical shadow-casting scheme was employed for the design.
    • Algorithms were developed for source pattern identification.
    • Input encoding and output mask generation strategies were formulated.

    Main Results:

    • A functional memory-efficient dual cell was designed.
    • A multi-output parallel arithmetic logic unit was successfully designed.
    • The efficacy of the presented design algorithms was demonstrated.

    Conclusions:

    • The polarization-encoded optical shadow-casting scheme provides an effective approach for designing efficient optical computing components.
    • This work contributes to the advancement of optical arithmetic logic units and memory cells.
    • The developed algorithms are crucial for the practical implementation of such optical systems.