Patents by Inventor Takashi Taya

Takashi Taya 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: 5075639
    Abstract: A PLL circuit suitable for fabrication into an integrated circuit includes: a first phase comparator for determining a phase difference between an input signal and a first feedback signal to produce a first phase difference signal in rsponse to the phase difference; a first loop filter for removing a high frequency constituent from the first phase difference signal; a first variable frequency oscillator which oscillates at a frequency which varies in response to an output of the first loop filter to produce the first feedback signal; a second phase comparator for determining a phase difference between a reference signal and a second feedback signal to produce a second phase difference signal in response to the phase difference; a second loop filter for removing a high frequency constituent from the second phase difference signal; a second variable frequency oscillator having substantially the same characteristics as those of the first variable frequency, oscillator which oscillates at a frequency which varies
    Type: Grant
    Filed: May 23, 1991
    Date of Patent: December 24, 1991
    Assignee: Oki Electric Industry Co., Ltd.
    Inventor: Takashi Taya
  • Patent number: 4852162
    Abstract: The present invention describes a low power consumption type subscriber line interface circuit (SLIC). The SLIC described in the present invention includes a first pair of potential detectors each of which detects the potential difference between each corresponding subscriber line and a first predetermined value, a second pair of potential difference detectors each of which detects a potential difference between each corresponding subscriber line and a second predetermined value, a pair of signal adder circuits each of which sums output signals from one of the first potential difference detectors and one of the second potential difference detectors, and a pair of amplifiers each of which amplifies each output signal from each signal summing circuit and returns a direct current to the each of corresponding subscriber lines.
    Type: Grant
    Filed: April 6, 1988
    Date of Patent: July 25, 1989
    Assignee: Oki Electric Industry Co., Ltd.
    Inventors: Takashi Taya, Toshiyuki Tahara
  • Patent number: 4766396
    Abstract: A current source type current output circuit for applying to a load a current which is proportional to an input includes an amplifier of the type receiving a current and producing a voltage, and a feedback circuit for feeding back an output of the amplifier to an input terminal of the amplifier. The feedback circuit is made up of a first, a second, and a third current mirror circuit, and a first, a second, and a third resistor. An output terminal of the amplifier is connected to an input terminal of the second current mirror circuit via the third resistor and to an input terminal of the first current mirror circuit via a series connection of the first and second resistors. The load is connected to the intermediate point of the serial connection of the first and second resistors. An output terminal of the second current mirror circuit is connected to an input terminal of the third current mirror circuit.
    Type: Grant
    Filed: August 7, 1987
    Date of Patent: August 23, 1988
    Assignee: Oki Electric Industry Co., Ltd.
    Inventors: Takashi Taya, Toshiyuki Tahara