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Related Concept Videos

MOSFET: Enhancement Mode01:22

MOSFET: Enhancement Mode

Enhancement-mode MOSFETs are pivotal components in electronics, distinguished by their capacity to act as highly efficient switches. They are part of the larger family of metal-oxide Semiconductor Field-Effect Transistors (MOSFETs). They are available in two types: p-channel and n-channel, each tailored to specific polarity operations.
In their basic form, enhancement-mode MOSFETs are typically non-conductive when the gate-source voltage (Vgs) is zero. This default 'off' state means no current...
Switching of BJT01:22

Switching of BJT

Switching behavior in Bipolar Junction Transistors (BJTs) is a fundamental aspect utilized in various electronic circuits, particularly for digital logic applications like switches and amplifiers. In a typical switching circuit, a BJT alternates between cut-off and saturation modes, corresponding to the "off" and "on" states, respectively, thus behaving like an ideal switch.
Cut-off Mode ("Off" State): In this state, both the emitter-base and collector-base junctions are reverse-biased. The...
Bipolar Junction Transistor01:22

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Bipolar Junction Transistors (BJTs) are essential elements in electronic circuits, playing a crucial role in the functionality of amplifiers, memories, and microprocessors. These transistors can be designed as NPN or PNP based on their doping patterns. They consist of three layers: the emitter, base, and collector. The configuration of these layers and their respective doping levels—with N-type or P-type impurities—define the transistor's type and its operational characteristics.
The structure...
MOSFET01:16

MOSFET

The Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) plays a pivotal role in modern electronics thanks to its versatility and efficiency in controlling electrical currents. This device, also known as IGFET, MISFET, and MOSFET, has three main terminals: the Source, Drain, and Gate. MOSFETs are classified into n-channel or p-channel types based on the doping characteristics of their substrate and the source or drain regions.
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MOSFET: Depletion Mode01:20

MOSFET: Depletion Mode

Depletion-mode MOSFETs represent a unique subset of MOSFET technology, functioning fundamentally differently from their enhancement-mode counterparts. Unlike enhancement MOSFETs, which require a positive gate-source voltage (Vgs) to turn on, depletion-mode MOSFETs are inherently conductive and "normally on" devices.
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Related Experiment Video

Updated: Jun 15, 2026

All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
11:33

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Published on: January 19, 2018

High performance avalanche transistor switchout for external pulse selection at 1.06 microm.

S J Davis, J E Murray, D C Downs

    Applied Optics
    |March 6, 2010
    PubMed
    Summary
    This summary is machine-generated.

    This study details an avalanche transistor switchout, a device that precisely selects single laser pulses from a continuous stream. It achieves high amplitude stability and excellent prepulse rejection for reliable optical switching applications.

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    Area of Science:

    • Optoelectronics
    • Pulsed Laser Systems
    • High-Speed Switching

    Background:

    • Mode-locked lasers generate high-repetition-rate pulse trains.
    • Selecting individual pulses from these trains is crucial for many applications.
    • Existing methods may suffer from amplitude variations or limited rejection ratios.

    Purpose of the Study:

    • To present the design and performance of a novel avalanche transistor switchout.
    • To demonstrate the device's capability for single pulse selection from mode-locked laser outputs.
    • To evaluate the amplitude stability and prepulse rejection of the switchout.

    Main Methods:

    • Development of a specialized avalanche transistor circuit.
    • Integration of the switchout with a continuous-wave (cw) or Q-switched mode-locked laser system.
    • Characterization of pulse selection accuracy, amplitude variation, and prepulse rejection ratio.

    Main Results:

    • The avalanche transistor switchout successfully selects single pulses from a pulse train.
    • Amplitude variation in the selected pulse is less than +/-1%.
    • A prepulse rejection ratio exceeding 10^7 and a device lifetime greater than 10^7 shots were achieved.

    Conclusions:

    • The developed avalanche transistor switchout offers high-precision single pulse selection.
    • The device demonstrates excellent performance metrics suitable for demanding optical applications.
    • This technology provides a robust solution for controlling pulsed laser outputs.