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Related Concept Videos

Passive Filters01:27

Passive Filters

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Passive filters are utilized to shape the frequency spectrum of signals across a diverse array of applications. These filters, using only passive elements like resistors (R), inductors (L), and capacitors (C), are capable of selectively allowing or blocking certain frequency ranges without the need for external power sources.
Low-Pass Filters
Low-pass filters are designed to transmit signals with frequencies lower than the cutoff frequency, ωc, and attenuate those above it. The cutoff...
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Bandpass Sampling01:17

Bandpass Sampling

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In signal processing, bandpass sampling is an effective technique for sampling signals that have most of their energy concentrated within a narrow frequency band. This type of signal is known as a bandpass signal. The key principle of bandpass sampling involves sampling the signal at a rate that is greater than twice the signal's bandwidth to prevent aliasing.
A bandpass signal has a spectrum with a lower frequency limit, denoted as ω1, and an upper frequency limit, denoted as ω2....
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Active Filters01:25

Active Filters

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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:
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Design Example01:23

Design Example

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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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Single-layer optical bandpass filter technology.

Manoj Niraula, Jae Woong Yoon, Robert Magnusson

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    |October 30, 2015
    PubMed
    Summary
    This summary is machine-generated.

    Researchers developed a novel, single-layer silicon bandpass filter. This sparse optical filter offers high efficiency and stability, outperforming traditional multi-layer designs for practical optical systems.

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    Area of Science:

    • Photonics and optical engineering
    • Materials science
    • Nanotechnology

    Background:

    • Resonant periodic structures offer enhanced stability and simplified fabrication for optical applications.
    • Traditional thin-film filters often require numerous layers, increasing complexity and potential for failure.
    • There is a need for robust, high-performance optical filters with simplified designs.

    Purpose of the Study:

    • To demonstrate a novel, single-layer bandpass filter utilizing resonant waveguide gratings.
    • To showcase the feasibility of sparse, high-efficiency optical filters with superior performance characteristics.
    • To present an integration-friendly technology for advanced optical systems.

    Main Methods:

    • Design and fabrication of a bandpass filter using a single patterned silicon layer on a quartz substrate.
    • Utilized rigorous solutions of Maxwell's equations and principles of resonant waveguide gratings.
    • Experimental characterization of the filter's transmittance, bandwidth, and sideband performance.

    Main Results:

    • Achieved a bandpass filter performance comparable to 15 traditional Si/SiO(2) thin-film layers.
    • Experimental filter demonstrated approximately 72% transmittance and a narrow bandwidth of ~0.5 nm.
    • Observed low sidebands spanning approximately 100 nm, indicating high spectral purity.

    Conclusions:

    • The feasibility of sparse narrowband, high-efficiency bandpass filters with wide, flat, and low sidebands is experimentally validated.
    • The proposed single-layer resonant structure offers a robust and stable alternative to complex thin-film filters.
    • This technology is integration-friendly and applicable to various spectral regions and disciplines.