摘要:
This invention relates to a semiconductor device, in which a singlecrystal semiconductor substrate whose principal surface is (111) is etched from the principal surface thereof in the direction perpendicular thereto to form a vertical trench and a lateral trench is formed at the bottom portion of the side wall of the vertical trench by effecting an anisotropic etching with respect to crystallographical axes so that the etching proceeds in the direction of axis, the lateral and the vertical trenches being filled with polycrystalline or amorphous semiconductor or insulator.
摘要:
A system for controlling the air-fuel ratio for an engine comprises a first passage for communicating a portion adjacent to an inlet of an air bleed of a carburetor of the engine with a portion of the intake passage between an air-cleaner and a supercharger, a valve provided in the first passage, an actuator comprising a diaphragm operatively connected to the valve and first and second chambers defined by the diaphragm. A second passage is provided for communicating the first chamber with the intake passage at the upstream side of the inlet of the air bleed, and a third passage is provided for communicating the second chamber with the intake passage at the downstream side of a throttle valve of the engine. The actuator is so arranged that the valve opens when the difference between pressures in the first and second chambers exceeds a predetermined value, thereby supplying rich air-fuel mixture.
摘要:
A system for controlling air-fuel ratio of air-fuel mixture for an internal combustion engine having a two-barrel carburetor. The system is provided with an O.sub.2 sensor for detecting the concentration of oxygen in the exhaust gases, an on-off electromagnetic valve for correcting the air-fuel ratio of the air-fuel mixture supplied by the carburetor and an electronic control circuit. The electronic control circuit operates to compare output signal of the detector with a stoichiometric value, and to produce driving pulses for driving the on-off electromagnetic valve and for controlling the air-fuel ratio to a value approximately equal to the stoichiometric air-fuel ratio. A fixed signal generating circuit is selectively connected to the electronic control circuit. The two-barrel carburetor has an actuator actuated by the vacuum at the venturi of the carburetor for opening a throttle valve of the secondary side of the carburetor. A first switch is provided to be operated in response to the actuation of the actuator and connected to a second switch in the control circuit. The second switch connects the fixed signal generating circuit to the electronic control circuit for providing a fixed duty ratio for the valve and renders the electronic control circuit non-responsive to the output of the O.sub.2 sensor.
摘要:
To realize a small size and high detection accuracy in a substance detection apparatus. A charge detection field effect transistor and a control circuit therefor are provided in each cell, and the control circuit controls the charge detection field effect transistor so that the drain-source voltage and the drain current of the charge detection field effect transistor are always maintained constant. The control circuit may be formed in a CMOS configuration including a small number of elements in a small area using a standard CMOS integrated circuit technique.
摘要:
A semiconductor integrated circuit device including a plurality of memory cells, each having a storage MOSFET holding information in a gate of the storage MOSFET, a write transistor supplying a write information voltage corresponding to the information to the gate storage MOSFET, and a capacitor having first and second terminals. Word lines and data lines are coupled with the memory cells. The first capacitor terminal is coupled with one of the word lines and the second capacitor terminal is coupled with the gate of the storage MOSFET. In a read operation of the semiconductor integrated circuit device, the gate voltage of the storage MOSFET is boosted by a transition of the word line from a first voltage to a second voltage greater than the first voltage.
摘要:
A semiconductor integrated circuit device including a plurality of memory cells, each having a storage MOSFET holding information in a gate of the storage MOSFET, a write transistor supplying a write information voltage corresponding to the information to the gate storage MOSFET, and a capacitor having first and second terminals. Word lines and data lines are coupled with the memory cells. The first capacitor terminal is coupled with one of the word lines and the second capacitor terminal is coupled with the gate of the storage MOSFET. In a read operation of the semiconductor integrated circuit device, the gate voltage of the storage MOSFET is boosted by a transition of the word line from a first voltage to a second voltage greater than the first voltage.
摘要:
A transistor device comprising source and drain regions (S, D), a nanotube structure (2, 3) providing a path for electrical charge carriers between the source and drain regions, and a gate region (4). The nanotube structure has its conduction band structure locally modified in the gate region, e.g. by doping, for controlling the passage of the charge carriers in the path. The device can be used as a flash memory or as a memory element in a DRAM.
摘要:
A high speed/large capacity DRAM (Dynamic Random Access Memory) is generally refreshed each 0.1 sec because it loses information stored therein due to a leakage current. The DRAM also loses information stored therein upon cutoff of a power source. Meanwhile, a nonvolatile ROM (Read-only Memory) cannot be configured as a high speed/large capacity memory. A semiconductor memory device of the present invention realizes nonvolatile characteristic by shielding a drain functioning as a memory node from a leakage current by a tunnel insulator, and also realizes stable and high speed operation by adding a transistor for reading to a memory cell.
摘要:
A high speed/large capacity DRAM (Dynamic Random Access Memory) is generally refreshed each 0.1 sec because it loses information stored therein due to a leakage current. The DRAM also loses information stored therein upon cutoff of a power source. Meanwhile, a nonvolatile ROM (Read-only Memory) cannot be configured as a high speed/large capacity memory. A semiconductor memory device of the present invention realizes nonvolatile characteristic by shielding a drain functioning as a memory node from a leakage current by a tunnel insulator, and also realizes stable and high speed operation by adding a transistor for reading to a memory cell.
摘要:
Disclosed are a gain cell structure capable of making a memory cell compact in size and a method of manufacturing the same at low cost. A memory cell is constituted of a reading MIS transistor and a writing MIS transistor. The reading MIS transistor has a pair of n+ type semiconductor regions (source region and drain region) formed on a main surface of a semiconductor substrate and a first gate electrode formed on a path of the n+ type semiconductor regions 13 via a first gate insulating film. The writing MIS transistor is arranged on the reading MIS transistor and has a layered structure made by laminating a lower semiconductor layer (source region), an intermediate semiconductor layer (channel forming region), and an upper semiconductor layer (drain region) in this order. The writing MIS transistor has a vertical structure in which a second gate electrode is arranged on both sidewalls of the layered structure via a second gate insulating film.