Patents by Inventor Taichi Saitoh

Taichi Saitoh has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 5436573
    Abstract: A semiconductor integrated circuit device has a first wire for transmitting a first signal and a second wire adjacent to the first wire, for transmitting a second signal having the stronger probability of having an opposite phase to that of the first signal. A space between the first and second wires is wider than a standard wiring space, to reduce a delay in the operation speed of the device due to wiring capacitance produced between the first and second wires.
    Type: Grant
    Filed: August 31, 1993
    Date of Patent: July 25, 1995
    Assignee: Fujitsu Limited
    Inventors: Rokutarou Ogawa, Taichi Saitoh, Tosiaki Sakai
  • Patent number: 5216296
    Abstract: A logic circuit in which first and second transistors are connected in series between high and low potential power sources with the middle point of the series connection used as the output terminal; A same- and inverse-phase signal generating unit is provided connected between the high and low potential power sources in parallel with the first and second transistors for generating same- and inverse-phase signals based on the single input signal output from the logic circuit. A transient signal generating unit is provided for generating transient large current signals at the rise time of the inverse-phase signals and generating transient cut-off signals at the fall time of the inverse-phase signals. The series connected first transistor is driven and controlled based on the regular-phase signals, while the second transistor is driven and controlled based on the transient large current signal and transient cut-off signal, thus producing an inverse-phase output by a simple circuit construction.
    Type: Grant
    Filed: June 11, 1992
    Date of Patent: June 1, 1993
    Assignee: Fujitsu Limited
    Inventors: Hiroyuki Tsunoi, Kazumasa Nawata, Toshiaki Sakai, Hiroki Yada, Hisayosi Ooba, Takayuki Tsuru, Satoru Sudo, Taichi Saitoh
  • Patent number: 5144158
    Abstract: A latch circuit including at least three gate circuits, and a noise resistance circuit. A first gate circuit (3, 4, 11, 16) receives a data signal (DT) and a clock signal (CLK). A second gate circuit (1, 7, 13, 17) is connected to an output of the first gate circuit. A third gate circuit (2, 5, 12 18) receives a first inverted clock signal (CLK) at an input terminal. A second input terminal of the third gate circuit is connected to an output of the second gate circuit and is a first output terminal is connected to an input terminal of the second gate circuit, so that a feedback line is formed between the second and third gate circuits. The noise resistance circuit (8, 9, 20, 21) has at least a signal delay element in the feedback line. The noise resistance circuit may include a filter circuit. The noise resistance circuit may also include an amplifier circuit.
    Type: Grant
    Filed: April 17, 1990
    Date of Patent: September 1, 1992
    Assignee: Fujitsu Limited
    Inventors: Yasunori Kanai, Kazumasa Nawata, Mitsuhisa Shimizu, Hiroki Yada, Taichi Saitoh, Toshiaki Sakai
  • Patent number: 5118973
    Abstract: An improved emitter coupled logic circuit suitable for high speed logic operation independent of capacitive load. With previous circuits as the load to be driven become heavier, the capacitive load required a longer time for discharge and the output signal was dulled, resulting in adverse effect on the logic operation when the output changed to a low level from a high level. A pulse has also been previously applied to a pull-down transistor connected between the output and a power source through a capacitor from an inverted phase output to actively discharge the capacitive load. However, when the capacitor is connected to the output it hinders the switching speed of a current switch. In the present invention, a transistor is provided an input circuit and a pulse is applied to a pull-down transistor from the transistor. As a result, an extra capacitive element is not connected to the output end, but a pulse is applied to the pull-down transistor.
    Type: Grant
    Filed: August 22, 1990
    Date of Patent: June 2, 1992
    Assignee: Fujitsu Limited
    Inventors: Toshiaki Sakai, Taichi Saitoh
  • Patent number: 4975544
    Abstract: A connecting structure for connecting conductors used for wiring in a semiconductor device comprises a first conductor provided on a part of the semiconductor device for passing the flow of electrons, an insulator provided on the first conductor and formed with a contact hole, and a second conductor provided on the insulator for passing the flow of electrons, in which the second conductor is provided so as to sandwich the insulator together with a part of the first conductor. The first and second conductors are contacted to each other across the insulator at the contact hole so that the electrons flow through the contact hole. The contact hole extends in a general direction of a flow of electrons passing therethrough and has a stepped shape in which a width measured perpendicularly to the general direction of the flow of electrons increases stepwise towards the general direction of the flow of electrons.
    Type: Grant
    Filed: March 15, 1989
    Date of Patent: December 4, 1990
    Assignees: Fujitsu Limited, Fujitsu Vlsi Limited
    Inventors: Nobuyuki Tanaka, Taichi Saitoh, Akio Kiso, Hideo Tokuda, Tetsuya Nakajima, Minoru Takagi
  • Patent number: 4678942
    Abstract: An ECL (Emitter Coupled Logic) circuit is provided which has an increased ability to drive a large capacitive load or to drive a large fan-out circuit, wherein the power consumption per gate is reduced. The output circuit of the ECL circuit is provided with an emitter follower transistor which has the current therethrough detected by a detecting transistor. A current control transistor is provided to quickly charge the load capacitance under the control of the detecting transistor, and thus, the voltage drop of the output signal is improved. One of the emitter follower transistor and the current transistor are always cut off when the other is in a conductive state, and therefore, the current running through the circuit is reduced.
    Type: Grant
    Filed: September 23, 1985
    Date of Patent: July 7, 1987
    Assignee: Fujitsu Limited
    Inventors: Yasunori Kanai, Taichi Saitoh