depletion mode


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depletion mode

[də′plē·shən ‚mōd]
(electronics)
Operation of a field-effect transistor in which current flows when the gate-source voltage is zero, and is increased or decreased by altering the gate-source voltage.

depletion mode

A transistor that is normally closed (on), allowing current to pass, but is triggered to open (off) and impede current. Contrast with "enhancement mode," wherein the transistor is normally open (off), but is triggered to close (on).


Depletion Mode Is "On"
Depletion mode transistors are always passsing current until they are turned off. Enhancement mode devices normally impeded current until they are triggered to turn close and turn on. (Image courtesy of Max Maxfield and techbites.com)
References in periodicals archive ?
The devices in question were enhancement mode FETs, whereas the test being employed was for depletion mode FETs; specifically, they tested the protection diode across the drain to the source in the FET.
As world oil goes into depletion mode very visibly after 2008 at about 6 percent per year, the world must improve use efficiency each year by 3 percent, increase the amount of long term renewable, wind and solar, energy produced, and take three percent from current uses to provide the power to accomplish the first and second three.
Explains Applications Engineer, Nigel Springett: "By using a depletion mode JFET, designers can achieve a fast start-up using no extra components.
The new ultra-high voltage (700V) process will include JFET and depletion mode LDMOS for start-up and low on resistance LDMOS for power devices.
Clare offers the industry's broadest lines of Solid State Relays (SSRs), featuring galvanic input-to-output electrical isolation from 1500 Vrms up to 5000 Vrms; Power SSRs; a wide selection of optocouplers and linear optocouplers; optically isolated AC Power Switches and Depletion Mode MOSFETs.
Currently we profitably produce a small high-end audio amplifier using the SJEP120R100A devices and are engaged in developing other higher power amplifiers using this and the SJDP120R085 depletion mode devices.
The MMIC products are offered in enhancement mode (E Mode LNA) and depletion mode (D Mode LNA) pHEMT amplifiers achieving sub 1 dB noise figure for better Rx sensitivity, and high-linearity performance.
The TQBiHEMT process incorporates three transistor types: A highly reliable InGaP HBT transistor, a depletion mode pHEMT transistor and an enhancement mode pHEMT transistor.
an IXYS company (NASDAQ:SYXI), announced the immediate availability of the CPC5603C N-channel depletion mode MOSFET device as a hook switch and linear regulator for LITELINK(TM) III Phone Line Interface IC applications.
The paper is titled, "85nm Gate Length Enhancement and Depletion mode InSb Quantum Well Transistors for Ultra High Speed and Very Low Power Digital Logic Applications.