Active solid-state devices (e.g. – transistors – solid-state diode – Field effect device – Junction field effect transistor
Patent
1997-07-07
1999-12-21
Chaudhuri, Olik
Active solid-state devices (e.g., transistors, solid-state diode
Field effect device
Junction field effect transistor
257270, 257365, 438157, 438176, H01L 2980, H01L 31112, H01L 2976, H01L 2994
Patent
active
060052678
ABSTRACT:
Disclosed is an improved field effect transistor (FET) employing both a metal-semiconductor (MES) gate and a metal-insulator-semiconductor (MIS) gate, which FET is particularly useful to provide amplification at microwave frequencies. The use of the MIS gate with appropriate biasing allows the carrier density within a selected portion of the device's channel region to be controlled. The carrier density control increases the breakdown voltage of the FET and enables the FET to be operated with higher maximum channel current and a higher drain to source voltage. As a result, higher output power is provided as compared to prior art MESFET devices of a similar size. Also disclosed is an amplifier circuit including the MES/MIS FET of the present invention, which amplifier circuit further includes means coupled to the MES/MIS FET for dividing a high frequency input signal to provide a first divided portion and a second divided portion. The first divided portion is applied to the MES gate while the second divided portion is applied to the MIS gate. The second portion operates as a time varying bias voltage to control carrier density within the channel portion of the MES/MIS FET and thereby control performance parameters such as breakdown voltage and maximum available channel current.
REFERENCES:
patent: 4179668 (1979-12-01), Schuermann
patent: 5012315 (1991-04-01), Shur
Ng, Kwok K., Complete Guide to Semiconductor Devices, McGraw-Hill (Pub), pp. 188-189, Jan. 1995.
Barsan, Radu M., "Analysis and Modeling of Dual-Gate MOSFET's ", IEEE Trans. Elec. Dev., vol. ED-28, No. 5, pp. 523-534, May, 1981.
Bahl Inder J.
Griffin Edward L.
Miller Dain Curtis
Chaudhuri Olik
ITT Corporation
Plevy Arthur L.
Weiss Howard
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