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Related Concept Videos

Operational Amplifiers01:17

Operational Amplifiers

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The operational amplifier, often referred to as an op-amp, is a multifaceted building block of a circuit. This electronic component functions like a voltage-controlled voltage source and can also be used to create a voltage- or current-controlled current source. The design of an operational amplifier enables it to execute mathematical operations when external components like resistors and capacitors are linked to its terminals. An op-amp has the capacity to sum signals, amplify a signal,...
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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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Bipolar Junction Transistors (BJTs) are pivotal components in amplifier circuits, functioning as voltage-controlled current sources in their active region. This characteristic allows them to efficiently control the collector current through variations in the base-emitter voltage. Essentially, BJTs amplify power due to their ability to take a weak input signal and output a much stronger signal.
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An electrocardiography (ECG) machine is an essential piece of medical equipment used to monitor the electrical activity of the heart. It operates by detecting small electrical changes on the skin that result from the depolarization of the heart muscle during each heartbeat. However, these signals are in the microvolt range and can be easily overwhelmed by noise or interference.
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Many receptor binding ligands are hydrophilic; they do not cross the cell membrane but bind to cell-surface receptors. Thus, their message must be relayed by second messengers present in the cell cytoplasm. There are several second messenger pathways, each with its own way of relaying information. For example, the G protein-coupled receptors can activate both phosphoinositol and cyclic AMP (cAMP) second messenger pathways. The phosphoinositol pathway is active when the receptor induces...
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Related Experiment Video

Updated: Feb 10, 2026

The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
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Phase-shift-amplified interferometry.

Moshe Ben Ayun, Egor Liokumovitch, Daniel Gotliv

    Optics Letters
    |May 16, 2018
    PubMed
    Summary

    We developed phase-shift-amplified interferometry (PAI), a new technique using two interferometers to significantly boost sensitivity. PAI enhances standard interferometers by over tenfold, improving noise immunity for more accurate measurements.

    Area of Science:

    • Optics and Photonics
    • Quantum Metrology

    Background:

    • Standard interferometers face limitations in sensitivity due to noise and signal degradation.
    • Improving measurement precision is crucial for advancements in various scientific and technological fields.

    Purpose of the Study:

    • To introduce and theoretically describe phase-shift-amplified interferometry (PAI), a novel technique for enhancing interferometer sensitivity.
    • To demonstrate the practical application and performance of PAI in experimental settings.

    Main Methods:

    • PAI utilizes two embedded interferometers, with the internal one biased in anti-phase to amplify phase shifts.
    • The amplified phase shift is then converted into an amplified intensity shift by the external interferometer.
    • Theoretical analysis covers PAI's immunity to relative intensity noise, phase noise, and other distortions.

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    Main Results:

    • PAI demonstrated the potential to improve interferometer sensitivity by an order of magnitude or more.
    • Experimental validation confirmed a phase-shift amplification factor of 11.
    • The technique shows enhanced robustness against common sources of noise and distortion.

    Conclusions:

    • Phase-shift-amplified interferometry (PAI) offers a significant advancement in measurement sensitivity for optical systems.
    • PAI provides a practical method to overcome sensitivity limitations in standard interferometers.
    • The enhanced noise immunity of PAI makes it suitable for high-precision metrology applications.