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Related Concept Videos

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

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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.
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Signal processing techniques are essential for accurately converting continuous signals to digital formats and vice versa. When a continuous signal is sampled with a period T, the resulting sampled signal exhibits replicas of the original spectrum in the frequency domain, spaced at intervals equal to the sampling frequency. To handle this sampled signal, a zero-order hold method can be applied, which creates a piecewise constant signal by retaining each sample's value until the next...
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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.
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Understanding the working function of different types of controllers can be illustrated with practical analogies, such as adjusting a stereo's volume equalizer. Cranking up the bass involves a phase-lead controller, which functions as a high-pass filter, while increasing the treble uses a phase-lag controller, which acts as a low-pass filter. PD controllers, similar to high-pass filters, enhance the system's response to high-frequency components. PI controllers, akin to low-pass...
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Accurate signal sampling and reconstruction are crucial in various signal-processing applications. A time-domain signal's spectrum can be revealed using its Fourier transform. When this signal is sampled at a specific frequency, it results in multiple scaled replicas of the original spectrum in the frequency domain. The spacing of these replicas is determined by the sampling frequency.
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An idealized LC circuit of zero resistance can oscillate without any source of emf by shifting the energy stored in the circuit between the electric and magnetic fields. In such an LC circuit, if the capacitor contains a charge q before the switch is closed, then all the energy of the circuit is initially stored in the electric field of the capacitor. This energy is given by
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Related Experiment Video

Updated: Dec 14, 2025

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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Low spurious optoelectronic oscillator achieved by frequency conversion filtering without deteriorating phase noise.

Shanhong Guan, Qizhuang Cen, Feifei Yin

    Optics Express
    |July 19, 2020
    PubMed
    Summary

    This study improves microwave signal quality by reducing phase noise and spurs in frequency-conversion filtering oscillators. An optoelectronic oscillator (OEO) design achieved 80 dB spur suppression and -130 dBc/Hz phase noise at 10 GHz.

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    Area of Science:

    • Electrical Engineering
    • Optoelectronics
    • Signal Processing

    Background:

    • Microwave signals require low spurs and phase noise for optimal performance.
    • Frequency-conversion filtering oscillators are crucial for generating high-quality microwave signals.
    • Residual phase noise in intermediate frequency (IF) filters impacts overall signal quality.

    Purpose of the Study:

    • To investigate methods for improving the phase noise performance of frequency-conversion filtering oscillators.
    • To analyze the impact of IF filter dispersion on residual phase noise.
    • To develop an optoelectronic oscillator (OEO) with enhanced spur suppression and reduced phase noise.

    Main Methods:

    • Analysis of intermediate frequency (IF) filter dispersion effects on residual phase noise.
    • Implementation of an electro-optic modulator for frequency up-conversion.
    • Integration of a long optical fiber (1.6 km) for extended intra-cavity delay.

    Main Results:

    • Achieved an 80 dB spurs suppression ratio in the proposed OEO.
    • Attained a phase noise of -130 dBc/Hz at a 10 kHz offset from 10 GHz.
    • Demonstrated a 10 dB improvement in phase noise compared to previous designs.

    Conclusions:

    • The proposed OEO design effectively reduces phase noise and suppresses spurs.
    • Extending intra-cavity delay with optical fiber is a viable method for enhancing OEO performance.
    • The study provides a pathway for generating high-purity microwave signals.