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Related Concept Videos

Design Example: Capacitance Multiplier Circuit01:20

Design Example: Capacitance Multiplier Circuit

779
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.
779

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Ultra-compact optical full-adder based on directed logic and microring resonators.

Feng Chen, Shenghang Zhou, Yuhong Xia

    Applied Optics
    |January 4, 2024
    PubMed
    Summary

    We developed an ultra-compact optical full-adder using directed logic and microring resonators, significantly reducing component count and footprint for advanced optical computing systems.

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    Area of Science:

    • Photonics
    • Optical Computing
    • Integrated Circuits

    Background:

    • Compact photonic integrated circuits (PICs) are crucial for optical computing.
    • Dense integration is hindered by the high component count in current optical designs.

    Purpose of the Study:

    • To propose an ultra-compact optical full-adder.
    • To reduce the number of optical components and the overall footprint.

    Main Methods:

    • Utilizing directed logic and microring resonators for circuit design.
    • Employing finite-difference time-domain (FDTD) simulations for validation.

    Main Results:

    • The proposed optical full-adder achieves a minimal footprint of 59.2µm × 29.2µm.
    • Demonstrates a maximum delay time of approximately 10 ps, enabling a 100 GHz data rate.

    Conclusions:

    • The proposed design offers a significant reduction in component count and size compared to existing solutions.
    • FDTD simulations confirm the effectiveness and feasibility of the ultra-compact optical full-adder for high-speed optical computing applications.