Abstract:
A semiconductor device according to the invention comprises: a GaAs substrate; a GaAs layer of a low impurity concentration formed on the GaAs substrate; an AlGaAs layer of a low impurity concentration formed on the GaAs layer; a gate electrode of silicon or a compound of silicon and a metal formed on the AlGaAs layer; and a source electrode and a drain electrode formed on the AlGaAs layer. With this structure, a high electron mobility transistor in which a threshold voltage Vth is substantially 0 can be obtained.
Abstract:
A high electron mobility transistor in which a threshold-voltage Vth is substantially zero comprises a GaAs substrate (1), a GaAs layer (2) of a low impurity concentration formed on the substrate (1), an AlGaAs layer (13) of a low impurity concentration formed on the GaAs layer (2), a gate electrode (5) of silicon or a compound of silicon and a metal formed on the AlGaAs layer (13), and a source electrode and a drain electrode (8, 9) formed on the AlGaAs layer (13). Other semiconductor materials e.g. AlGaIn or AlInP may be used for the layer (13).
Abstract:
A high electron mobility transistor in which a threshold-voltage Vth is substantially zero comprises a GaAs substrate (1), a GaAs layer (2) of a low impurity concentration formed on the substrate (1), an AlGaAs layer (13) of a low impurity concentration formed on the GaAs layer (2), a gate electrode (5) of silicon or a compound of silicon and a metal formed on the AlGaAs layer (13), and a source electrode and a drain electrode (8, 9) formed on the AlGaAs layer (13). Other semiconductor materials e.g. AlGaIn or AlInP may be used for the layer (13).
Abstract:
A high electron mobility transistor in which a threshold-voltage Vth is substantially zero comprises a GaAs substrate (1), a GaAs layer (2) of a low impurity concentration formed on the substrate (1), an AlGaAs layer (13) of a low impurity concentration formed on the GaAs layer (2), a gate electrode (5) of silicon or a compound of silicon and a metal formed on the AlGaAs layer (13), and a source electrode and a drain electrode (8, 9) formed on the AlGaAs layer (13). Other semiconductor materials e.g. AlGaIn or AlInP may be used for the layer (13).
Abstract:
A high electron mobility transistor in which a threshold-voltage Vth is substantially zero comprises a GaAs substrate (1), a GaAs layer (2) of a low impurity concentration formed on the substrate (1), an AlGaAs layer (13) of a low impurity concentration formed on the GaAs layer (2), a gate electrode (5) of silicon or a compound of silicon and a metal formed on the AlGaAs layer (13), and a source electrode and a drain electrode (8, 9) formed on the AlGaAs layer (13). Other semiconductor materials e.g. AlGaIn or AlInP may be used for the layer (13).
Abstract:
A high electron mobility transistor in which a threshold-voltage Vth is substantially zero comprises a GaAs substrate (1), a GaAs layer (2) of a low impurity concentration formed on the substrate (1), an AlGaAs layer (13) of a low impurity concentration formed on the GaAs layer (2), a gate electrode (5) of silicon or a compound of silicon and a metal formed on the AlGaAs layer (13), and a source electrode and a drain electrode (8, 9) formed on the AlGaAs layer (13). Other semiconductor materials e.g. AlGaIn or AlInP may be used for the layer (13).
Abstract:
A high electron mobility transistor in which a threshold-voltage Vth is substantially zero comprises a GaAs substrate (1), a GaAs layer (2) of a low impurity concentration formed on the substrate (1), an AlGaAs layer (13) of a low impurity concentration formed on the GaAs layer (2), a gate electrode (5) of silicon or a compound of silicon and a metal formed on the AlGaAs layer (13), and a source electrode and a drain electrode (8, 9) formed on the AlGaAs layer (13). Other semiconductor materials e.g. AlGaIn or AlInP may be used for the layer (13).
Abstract:
PROBLEM TO BE SOLVED: To record contents which speakers at remote places simultaneously have viewed, and video images and voices of the speakers so that they can be reproduced. SOLUTION: In a step S11, synthesizing information including parameters concerning the setting of the compositing status of video images and voices of contents and the setting of the synthesizing status of video images and voices of a user, and a present standard time is generated and stored. In a step S13, the standard time is added to the contents currently reproduced to start recording. In a step S15, the standard time is added to real time data of a user A etc. to start recording. In a step S17, the standard time is added to real time data of a user X etc. to start recording. In a step S18, it is determined whether or not the setting of a composition is changed. If the setting is changed in a step S19, the synthesizing information is regenerated and stored. This apparatus is applicable to a communication apparatus between remote places, for example. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To make an automobile more familiar to an occupant through an on-vehicle device, the automobile, and an information processing method. SOLUTION: Illuminations 2 installed on the inside of the automobile are lit according to automobile information DC obtained by detecting a state of the automobile and occupant information DB obtained by detecting a state of the occupant.
Abstract:
PROBLEM TO BE SOLVED: To match movement of an object represented by a computer with the movement of the actual object. SOLUTION: When a moving state of a four-wheeled automobile model 2 present at a gaze position 1 of a user in a virtual space 3 that the user 1 generates by operating a moving picture generating means is represented by moving the model according to arithmetic values calculated by the moving picture generating means according to operation by a method for representing actual movement in, for example, a driving simulator game or the like, the arithmetic values are corrected with data of the moving state corresponding to the actual driving operation of the four-wheeled automobile corresponding to the four-wheeled automobile model 2 and the movement of this model 2 can be represented really as the movement profiling the moving state corresponding to the actual driving operation of the four-wheeled automobile.