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Related Concept Videos

Rectangular and Triangular Pulse Function01:19

Rectangular and Triangular Pulse Function

The unit rectangular pulse function is mathematically represented by a rectangular function centered at the origin with a height of one unit. This function is defined by two parameters: T, which specifies the center location of the pulse along the time axis, and τ, which determines the pulse duration.
For example, consider a rectangular pulse with a 5V amplitude, a 3-second duration, and centered at t=2 seconds. This pulse can be expressed using the rectangular function, written as,
Effective Value of a Periodic Waveform01:07

Effective Value of a Periodic Waveform

The concept of effective value, the root mean square (RMS) value, is crucial in understanding electrical circuits and power delivery. This idea emerges from the necessity to measure the effectiveness of a voltage or current source in supplying power to a resistive load.
The effective value of a periodic current represents the direct current (DC) that conveys the same average power to a resistor as the periodic current itself. This concept is crucial when assessing AC circuits. To determine the...
Clipper Circuit01:18

Clipper Circuit

A clipper circuit is a fundamental wave-shaping device that harnesses the unique properties of diodes to alter and control waveform characteristics. This technology is widely used in electronic devices, especially in television and radar communication systems, where it enhances waveform modulation in both transmitters and receivers.
The operation of a clipper circuit can be exemplified by analyzing a dual-clipper configuration setup that integrates two ideal diodes, each paired with a biasing...
NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
Generating Electromagnetic Radiations01:10

Generating Electromagnetic Radiations

The German physicist Heinrich Hertz (1857–1894) was the first to generate and detect certain types of electromagnetic waves in the laboratory. Starting in 1887, he performed a series of experiments that confirmed the existence of electromagnetic waves and verified that they travel at the speed of light. Hertz used an alternating-current RLC (resistor-inductor-capacitor) circuit that resonated at a known frequency and connected it to a loop of wire. High voltages induced across the gap in the...
Wave Parameters01:10

Wave Parameters

The simplest mechanical waves are associated with simple harmonic motion and repeat themselves for several cycles. These simple harmonic waves can be modeled using a combination of sine and cosine functions. Consider a simplified surface water wave that moves across the water's surface. Unlike complex ocean waves, in surface water waves, water moves vertically, oscillating up and down, whereas the disturbance of the wave moves horizontally through the medium. If a seagull is floating on the...

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Related Experiment Video

Updated: Jul 10, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Millimeter-wave arbitrary waveform generation with a direct space-to-time pulse shaper.

J D McKinney, D E Leaird, A M Weiner

    Optics Letters
    |November 21, 2007
    PubMed
    Summary

    Researchers generated millimeter-wave arbitrary waveforms up to 50 GHz using a novel pulse shaper and photodetector. This enables precise control over phase and frequency modulation for advanced signal synthesis.

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    Area of Science:

    • Photonics
    • Electrical Engineering
    • Signal Processing

    Background:

    • Millimeter-wave (mmWave) signals are crucial for high-speed communication and sensing.
    • Generating arbitrary waveforms at mmWave frequencies with fine control remains a challenge.

    Purpose of the Study:

    • To demonstrate novel arbitrary waveform generation at millimeter-wave frequencies.
    • To achieve precise cycle-by-cycle control over phase and frequency modulation.

    Main Methods:

    • Utilized a novel 1.5-microm direct space-to-time pulse shaper.
    • Employed tailored optical pulse sequences to drive a high-speed photodetector.

    Main Results:

    • Achieved arbitrary waveform generation at center frequencies approaching 50 GHz.
    • Demonstrated synthesis of strongly phase- and frequency-modulated mmWave electrical signals on a cycle-by-cycle basis.

    Conclusions:

    • The developed technique offers a new method for generating complex mmWave signals.
    • This advancement has potential applications in advanced communication systems and electronic warfare.