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Related Concept Videos

Active Filters01:25

Active Filters

Active filters are electronic circuits that use operational amplifiers (op-amps), resistors, and capacitors to filter out unwanted frequency components from a signal. A first-order low-pass active filter is designed to pass signals with a frequency lower than a certain cutoff frequency and attenuate frequencies higher than that cutoff frequency. The transfer function for a first-order low-pass active filter is:
Design Example01:23

Design Example

The innovation of touch-tone telephony revolutionized the telecommunications industry by replacing the traditional rotary dial with a dual-tone multi-frequency (DTMF) signaling system. This system uses a matrix-style keypad with buttons arranged in four rows and three columns, creating 12 distinct signals each assigned to a pair of frequencies. Each button press results in a simultaneous generation of two sinusoidal tones – one from a low-frequency group (697 to 941 Hz) and one from a...

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Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters
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Database filter: optoelectronic design and implementation.

R D Snyder, S A Feld, P J Stanko

    Applied Optics
    |July 10, 1997
    PubMed
    Summary

    This study demonstrates an optoelectronic parallel-processing database filter. It uses logic gates and vertical-cavity surface-emitting lasers (VCSELs) for efficient data selection and matching.

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    Area of Science:

    • Optoelectronics
    • Computer Engineering
    • Database Systems

    Background:

    • Traditional database filtering can be a bottleneck in high-throughput data processing.
    • Optoelectronic systems offer potential for faster parallel processing due to the speed of light.

    Purpose of the Study:

    • To present the successful demonstration of a selection module for an optoelectronic parallel-processing database filter.
    • To detail the design and functionality of the integrated logic gate arrays and optical interconnections.

    Main Methods:

    • Fabrication of 4x4 arrays of AND and XOR logic gates using InGaP/GaAs heterojunction phototransistors.
    • Integration of these phototransistors to drive vertical-cavity surface-emitting lasers (VCSELs) for optical interconnections.
    • System design and optical power budget analysis.

    Main Results:

    • Successful demonstration of the selection module's functionality.
    • The AND gates reduced data fields, while XOR gates performed data matching.
    • VCSELs enabled effective free-space optical interconnection between module stages.

    Conclusions:

    • The developed optoelectronic selection module shows promise for high-speed database filtering.
    • The system design effectively utilizes optical interconnections for parallel processing.
    • Further optimization of the optical power budget is crucial for scalability.