US PATENT SUBCLASS 327 / 328
.~.~.~.~ Field-effect type device

Current as of: June, 1999
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327 /   HD   MISCELLANEOUS ACTIVE ELECTRICAL NONLINEAR DEVICES, CIRCUITS, AND SYSTEMS

100  DF  SIGNAL CONVERTING, SHAPING, OR GENERATING {29}
306  DF  .~ Amplitude control {5}
309  DF  .~.~ By limiting, clipping, or clamping {10}
327  DF  .~.~.~ Using only transistor active elements {1}
328.~.~.~.~ Field-effect type device

DEFINITION

Classification: 327/328

Field-effect type device:

(under subclass 327) Subject matter which includes a unipolar transistor in which current carriers are injected at a source terminal and pass to a drain terminal through a channel of semiconductor material whose conductivity depends largely on an electrical field applied to the semiconductor from a control electrode (gate).

(1) Note. In a unipolar transistor, the source to drain current involves only one type of charge carrier (i.e., holes

in a p-type channel and electrons in an n-type channel).

(2) Note. Two types of FET structures are prevalent: (a) an all-junction device, known as a junction FET or JFET characterized by having heavily doped impurity regions of one type (e.g., p-type material), known as gate regions, on both sides of a second type semiconductor bar (e.g., n+ type material) to form a pn junction, and (b) a device such as a MOSFET/IGFET, consisting of a lightly doped substrate (e.g., p-type material) into which two highly doped regions (e.g., n+ type material) are diffused for forming source/drain regions with the area therebetween becoming the channel for current carriers (i.e., holes or electrons) and with a layer of insulating material (e.g., SiO2) grown over the channel surface for separating the channel from a control (i.e., gate) electrode.

SEE OR SEARCH THIS CLASS, SUBCLASS:

51+, for a sensing amplifier which may utilize an FET bistable circuit.

310+, for controlled shunt-type limiting, clipping, or clamping with one or more field-effect transistor devices to reduce unwanted noise signals.

581, for field-effect device circuits, per se. SEE OR SEARCH CLASS

257, Active Solid-State Devices (e.g., Transistors, Solid-State Diodes),

213+, for field-effect devices, per se.