Browse Definitions:
Definition

gallium arsenide field-effect transistor (GaAsFET)

Also see metal-oxide semiconductor field-effect transistor .

A gallium arsenide field-effect transistor (GaAsFET) is a specialized type of field-effect transistor ( FET ) that is used in amplifier circuits at very-high, ultra-high, and microwave radio frequencies. This spans the electromagnetic radiation spectrum from approximately 30 MHz up to the infrared band. The GaAsFET is known for its sensitivity, and especially for the fact that it generates very little internal noise. This is because gallium arsenide has exceptional carrier mobility. The electron s and hole s move through the semiconductor material easily and fast. The GaAsFET is a depletion-mode device. This means that it conducts when no voltage is applied to the control electrode (gate), and when a voltage appears at the gate, the channel conductivity decreases.

In weak-signal wireless communications and broadcast reception, GaAsFET devices perform better than most other types of FET. Some types of GaAsFET are used as radio-frequency ( RF ) power amplifiers. GaAsFETs are employed in space communications, in radio astronomy, and in experiments conducted by amateur radio operators.

This was last updated in March 2011

Start the conversation

Send me notifications when other members comment.

By submitting you agree to receive email from TechTarget and its partners. If you reside outside of the United States, you consent to having your personal data transferred to and processed in the United States. Privacy

Please create a username to comment.

-ADS BY GOOGLE

File Extensions and File Formats

SearchCompliance

  • internal audit (IA)

    An internal audit (IA) is an organizational initiative to monitor and analyze its own business operations in order to determine ...

  • pure risk (absolute risk)

    Pure risk, also called absolute risk, is a category of threat that is beyond human control and has only one possible outcome if ...

  • risk assessment

    Risk assessment is the identification of hazards that could negatively impact an organization's ability to conduct business.

SearchSecurity

  • security information and event management (SIEM)

    Security information and event management (SIEM) is an approach to security management that seeks to provide a holistic view of ...

  • polymorphic virus

    A polymorphic virus is a harmful, destructive or intrusive type of malware that can change or 'morph,' making it difficult to ...

  • cyberterrorism

    According to the U.S. Federal Bureau of Investigation, cyberterrorism is any 'premeditated, politically motivated attack against ...

SearchHealthIT

  • accountable care organization (ACO)

    An accountable care organization (ACO) is an association of hospitals, healthcare providers and insurers in which all parties ...

  • patient engagement

    Patient engagement is an ideal healthcare situation in which people are well-informed about -- and motivated to be involved -- in...

  • personal health record (PHR)

    A personal health record (PHR) is a collection of health-related information that is documented and maintained by the individual ...

SearchDisasterRecovery

  • business continuity and disaster recovery (BCDR)

    Business continuity and disaster recovery (BCDR) are closely related practices that describe an organization's preparation for ...

  • business continuity plan (BCP)

    A business continuity plan (BCP) is a document that consists of the critical information an organization needs to continue ...

  • call tree

    A call tree -- sometimes referred to as a phone tree -- is a telecommunications chain for notifying specific individuals of an ...

SearchStorage

SearchSolidStateStorage

  • hybrid hard disk drive (HDD)

    A hybrid hard disk drive is an electromechanical spinning hard disk that contains some amount of NAND Flash memory.

Close