摘要:
This invention provides a method for manufacturing silicon single crystals. The method is capable of eliminating void defects existing in deep regions of a silicon single crystal despite the size of the silicon single crystal. The silicon single crystals according to this invention are pulled the radius of a ring-shaped oxidation induced stacking fault (OSF ring) of a wafer is larger than half the radius of the wafer during the process of thermal oxidation treatment.
摘要:
As the semiconductor chip is large-sized, highly integrated and speeded up, it becomes difficult to pack the semiconductor chip together with leads in a package. In view of this difficulty, there has been adopted the package structure called the "Lead-On-Chip" or "Chip-On-Lead" structure in which the semiconductor and the leads are stacked and packed. In the package of this structure, according to the present invention, the gap between the leading end portions of the inner leads and the semiconductor chip is made wider than that between the inner lead portions except the leading end portions and the semiconductor chip thereby to reduce the stray capacity, to improve the signal transmission rate and to reduce the electrical noises.
摘要:
A communication system includes a control unit, a switch and a diversity hand-over processing unit connected to the control unit and the switch for receiving, both a first communication signal received from a radio base station which outputs the hand-over instruction, and a second communication signal which receives it from another radio base station to which the communication signal will be hand-over to output one of the first and second communication signals to the associated interface circuit, and for transmitting the communication signal received through the radio base station from the mobile station on the reception side for communication to both the interface circuit associated with the radio base station as a source of hand-over and the interface circuit associated with the radio base station as a destination of hand-over. Thus, during the hand-over, the diversity hand-over processing unit transmits the communication signal from the mobile station on the reception side for communication to both the radio base station as a source of hand-over and the radio base station as a destination of hand-over so that the communication is established between the mobile station on the transmission side for communication and the mobile station as a destination of hand-over and on the reception side for communication.
摘要:
There is provided a field effect transistor including (a) an amorphous semiconductor layer made of amorphous silicon hydride containing impurities doped therein, (b) a semiconductor layer made of single crystal silicon having an electron affinity greater than that of the amorphous silicon hydride, formed on the amorphous semiconductor layer, (c) a gate insulating film formed on the semiconductor layer, and (d) a gate electrode formed on the gate insulating film. The amorphous semiconductor layer and the semiconductor layer cooperate with each other to thereby form a potential well at a junction therebetween. The above mentioned field effect transistor utilizes a difference in electron affinity between the amorphous semiconductor layer and the semiconductor layer to thereby make it possible to operate at a higher speed because carriers are not influenced by scattering of doped ions. In addition, the formation of a single crystal silicon layer on an amorphous silicon layer, which would be difficult to fabricate by epitaxial growth, can be accomplished by means of ion implantation, and can be operated in accordance with the operation principle of a conventional MOS transistor.
摘要:
As the semiconductor chip is large-sized, highly integrated and speeded up, it becomes difficult to pack the semiconductor chip together with leads in a package. In view of this difficulty, there has been adopted the package structure called the "Lead-On-Chip" or "Chip-On-Lead" structure in which the semiconductor and the leads are stacked and packed. In the package of this structure, according to the present invention, the gap between the leading end portions of the inner leads and the semiconductor chip is made wider than that between the inner lead portions except the leading end portions and the semiconductor chip thereby to reduce the stray capacity, to improve the signal transmission rate and to reduce the electrical noises.
摘要:
As the semiconductor chip is large-sized, highly integrated and speeded up, it becomes difficult to pack the semiconductor chip together with leads in a package. In view of this difficulty, there has been adopted the package structure called the "Lead-On-Chip" or "Chip-On-Lead" structure in which the semiconductor and the leads are stacked and packed. In the package of this structure, according to the present invention, the gap between the leading end portions of the inner leads and the semiconductor chip is made wider than that between the inner lead portions except the leading end portions and the semiconductor chip thereby to reduce the stray capacity, to improve the signal transmission rate and to reduce the electrical noises.
摘要:
A semiconductor chip module includes semiconductor chips each of which has contacts on its entire front face. A multi-layered organic circuit board having a small dielectric constant is provided for mounting the semiconductor chips. Intermediate ceramic substrates having the same thermal expansion coefficient as that of the semiconductor chip, are also provided. Each such intermediate ceramic substrate has contacts on its front and back faces corresponding to those of the semiconductor chip. These contacts are electrically connected directly in a one-to-one relationship. The contacts on the semiconductor chip and the corresponding ones on the front face of the intermediate ceramic substrates are connected by solder. The contacts on the back face of the intermediate ceramic substrate and the corresponding contacts on the front face of the multi-layered ceramic circuit board are connected by respective conductive pins having a predetermined flexibility and rigidity through a predetermined gap therebetween. With this arrangement, the relative displacement due to a thermal expansion difference between the intermediate ceramic substrate and the multi-layered organic circuit board is permitted without causing substantial stress thereon.
摘要:
A method of fabricating a polycrystalline silicon wafer, which method includes the steps of radially outwardly flowing molten liquid of silicon base material on the wafer forming surface of a turntable mechanism by means of centrifugal force, thereby forming a thin molten liquid layer in a prescribed atmosphere, and cooling and solidifying the same. An apparatus for fabricating the wafer is used to carry out the method with a recover tray arranged at the wafer forming surface for receiving the excessive silicon liquid scattered, and a wafer tray placed on the recovery tray. The wafer forming surface is cooled with coolant flowing in the wafer forming mechanism. Thus, large crystalline grains can be grown on the wafer in free states with the atmosphere from the inner surfaces of the casting mold.
摘要:
A smoke-retardant polyisocyanurate foam which contains an organosilicate having hydroxypolyoxyalkylene group which is obtained by reacting a polyoxyalkyleneglycol with at least one of metallic silicon, halosilicon compounds and lower alkyl silicates.
摘要:
A tool radius adjusting device executes an operation for adjusting the tool radius of a boring holder in parallel with execution of a machining program for executing an operation of a spindle head and an operation of a tool changer. A carrier control unit determines whether the tool changer is executing a tool changing process. When the tool changing process is not being executed, the carrier control unit allows the carrier device to execute an operation for picking the boring holder out from the tool magazine and an operation for returning the boring holder, of which the tool radius has been adjusted, to the tool magazine.