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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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Properties of Fourier Transform II01:24

Properties of Fourier Transform II

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The Fourier Transform (FT) is an essential mathematical tool in signal processing, transforming a time-domain signal into its frequency-domain representation. This transformation elucidates the relationship between time and frequency domains through several properties, each revealing unique aspects of signal behavior.
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MOSFET Amplifiers01:17

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The MOSFET, when operating in its active region, functions as a voltage-controlled current source. In this region, the gate-to-source voltage controls the drain current. This principle underlies the operation of the transconductance MOSFET amplifier. The output current is directed through a load resistor to convert this amplifier into a voltage amplifier. The output voltage is then obtained by subtracting the voltage drop across the load resistance from the supply voltage. This process results...
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¹³C NMR: ¹H–¹³C Decoupling01:04

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The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
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IR Frequency Region: X–H Stretching01:24

IR Frequency Region: X–H Stretching

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In IR spectroscopy, signals produced by the X−H bonds (such as C−H, O−H, or N−H) can be observed in the frequency range of  2700–4000 cm–1. The C−H stretching vibration forms sharp bands in the region 2850–3000 cm–1. The presence of the O−H stretching vibration leads to the forming of an absorption band in the frequency range 3650–3200 cm−1. At the same time, N−H stretching can be confirmed by absorption bands in...
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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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Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters
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On-chip multi-beam frequency shifter through sideband separation.

Emiel Dieussaert, Roel Baets, Yanlu Li

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    This study presents a new photonic integrated circuit component that creates multiple optical beams with varied frequency shifts using an array of modulators. This innovation is ideal for advanced systems like multi-beam laser Doppler vibrometry.

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    Area of Science:

    • Photonics
    • Integrated Optics
    • Optical Engineering

    Background:

    • Photonic integrated circuits (PICs) are crucial for advanced optical systems.
    • Optical frequency shifting is a key function in many photonic applications.
    • Existing methods for multi-beam frequency shifting can be complex or limited.

    Purpose of the Study:

    • To introduce a novel multi-beam optical frequency shifting component for PICs.
    • To enable the generation of multiple optical beams with distinct frequency shifts.
    • To provide a versatile component for applications such as multi-beam laser Doppler vibrometry (LDV).

    Main Methods:

    • Utilizing an array of parallel optical modulators integrated with a free-propagation region (FPR).
    • Employing periodic wave-like modulation in the modulator array.
    • Directing discrete harmonic content to different outputs via controlled delay between modulators.

    Main Results:

    • A design with a 16-element modulator array and 5 outputs was simulated.
    • The component successfully generated and collected 5 distinct harmonics (-2, -1, 0, +1, +2) at different outputs.
    • Achieved sideband suppression ratios between 20 dB and 30 dB for each output.

    Conclusions:

    • The proposed component offers a novel and effective method for multi-beam optical frequency shifting in PICs.
    • The design demonstrates high performance in harmonic generation and spectral purity.
    • The component's architecture is adaptable for optimization in specific application contexts.