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Related Concept Videos

Design Example: Capacitance Multiplier Circuit01:20

Design Example: Capacitance Multiplier Circuit

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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.
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Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
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Silicon microring modulator-based RF mixer for millimeter-wave phase-coded signal generation.

Yiwei Xie, Leimeng Zhuang, Arthur James Lowery

    Optics Letters
    |July 15, 2017
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    Summary
    This summary is machine-generated.

    Researchers developed a compact, low-cost method for generating binary-phase-coded millimeter-wave signals using integrated microwave photonics. This approach overcomes limitations of traditional electronics for advanced radar systems.

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    Area of Science:

    • Integrated Microwave Photonics
    • Radio Frequency (RF) Engineering
    • Millimeter-Wave Technology

    Background:

    • Phase-coded RF pulses are crucial for high-range resolution in radar systems.
    • Conventional electronic methods for generating these signals are costly, power-intensive, and limited in frequency and flexibility.
    • Modern radar demands high frequencies (millimeter-wave), compactness, and flexibility, challenging existing electronic solutions.

    Purpose of the Study:

    • To present an integrated microwave photonic method for generating binary-phase-coded millimeter-wave signals.
    • To demonstrate a compact and flexible alternative to conventional electronic signal generation.
    • To address the need for advanced signal generation in next-generation radar systems.

    Main Methods:

    • Utilized a silicon microring modulator (0.13 mm x 0.32 mm) with a 23 GHz modulation bandwidth.
    • Employed RF seed frequencies of 17.5 GHz and 20 GHz.
    • Experimentally generated binary-phase-coded signals at 35 GHz and 40 GHz.

    Main Results:

    • Successfully generated binary-phase-coded millimeter-wave signals at 35 GHz and 40 GHz.
    • Achieved high performance with pulse compression ratios of 94 and 106.
    • Demonstrated the feasibility of the integrated photonic approach for signal generation.

    Conclusions:

    • The proposed integrated microwave photonic method enables efficient generation of binary-phase-coded millimeter-wave signals.
    • This technology offers a path towards chip-scale, flexible, and cost-effective millimeter-wave signal generators.
    • The findings support the advancement of compact and high-performance radar systems.