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Related Concept Videos

Time and frequency -Domain Interpretation of Phase-lag Control01:21

Time and frequency -Domain Interpretation of Phase-lag Control

338
Phase-lag controllers are widely used in control systems to improve stability and reduce steady-state errors. A dimmer switch controlling the brightness of a light bulb serves as a practical example of phase-lag control, gradually adjusting the bulb's brightness. Mathematically, phase-lag control or low-pass filtering is represented when the factor 'a' is less than 1.
Phase-lag controllers do not place a pole at zero, but instead influence the steady-state error by amplifying any...
338
Upsampling01:22

Upsampling

531
Managing signal sampling rates is essential in digital signal processing to maintain signal integrity. A decimated signal, characterized by a reduced frequency range due to its lower sampling rate, can be upsampled by inserting zeros between each sample. This upsampling process expands the original spectrum and introduces repeated spectral replicas at intervals dictated by the new Nyquist frequency. To refine this zero-inserted sequence, it is passed through a lowpass filter with a cutoff...
531
Time and frequency -Domain Interpretation of Phase-lead Control01:24

Time and frequency -Domain Interpretation of Phase-lead Control

381
Phase-lead controllers are commonly used in various control systems to enhance response speed and stability. Adjusting the brightness on a television screen offers a practical example of phase-lead control. When contrast is enhanced, a phase-lead controller is employed. Mathematically, phase-lead control is identified when the first parameter is smaller than the second.
The design of phase-lead control involves the strategic placement of poles and zeros to balance steady-state error and system...
381

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Quasi-light Storage for Optical Data Packets
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Remote broadband RF signal down-conversion with stable phase and high efficiency using a sideband optical

Baiyu Li, Wei Wei, Daming Han

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    This study presents a phase-stable method for down-converting remote radio frequency signals. The technique enhances signal gain and dynamic range, enabling efficient broadband signal processing.

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    Area of Science:

    • Optoelectronics
    • Radio Frequency Engineering
    • Signal Processing

    Background:

    • Remote signal transmission often suffers from degradation.
    • Efficient down-conversion of broadband radio frequency (RF) signals is crucial for various applications.
    • Maintaining signal integrity over long distances presents significant challenges.

    Purpose of the Study:

    • To propose and demonstrate a phase-stable, high-efficiency down-conversion approach for broadband RF signals from remote sites.
    • To enhance conversion gain and spurious-free dynamic range (SFDR) for improved signal quality.
    • To enable simple-structured remote ends for weak broadband signal down-conversion.

    Main Methods:

    • Utilizing a high-power coherent optical local oscillator at the local site.
    • Employing a sideband optical phase-locked loop (OPLL) to suppress fiber-induced phase noise and laser frequency drift.
    • Experimental demonstration of single-frequency and broadband signal down-conversion.

    Main Results:

    • Achieved 3 dB gain and 103 dB/Hz2/3 SFDR for a 16.45 GHz signal down-converted to 250 MHz after 10 km fiber transmission.
    • Demonstrated broadband down-conversion of a 1 GHz wide linear frequency modulated (LFM) pulse signal.
    • Obtained an average SFDR of 97.6 dB/Hz2/3 for down-conversion from 5 GHz to 40 GHz with positive gain.

    Conclusions:

    • The proposed phase-stable down-conversion approach offers high efficiency and improved SFDR.
    • The method effectively mitigates phase noise and frequency drift issues in remote signal transmission.
    • This technique is well-suited for weak broadband remote signal down-conversion, requiring a simple remote-end structure.