Patents by Inventor Hironori Iga

Hironori Iga 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).

  • Signal conversion circuit for stable differential amplification and semiconductor device provided with the same as input buffer
    Publication number: 20020005758
    Abstract: An input buffer of a signal level conversion circuit according to the present invention includes: a differential amplification circuit of a current mirror amplifier amplifying a potential difference of first and second nodes respectively supplied with an external signal and a reference signal for outputting an internal signal; and a bias circuit applying the same bias potential to the first and second nodes. The bias potential is set in such a way that potentials at the first and second nodes are set to a level where a group of transistors forming the current mirror amplifier can operate in a saturation region regardless of the levels of the external signal and the reference signal.
    Type: Application
    Filed: January 16, 2001
    Publication date: January 17, 2002
    Applicant: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Hironori Iga
  • Semiconductor storage device
    Patent number: 6304507
    Abstract: A semiconductor storage device which allows a differential sense amplifier to perform a normal amplifying operation even if a potential difference occurring in a pair of bit lines in readout of memory cell information is small. If a potential difference occurring in the pair of bit lines in readout of memory cell information is small, the differential sense amplifier can not normally perform an operation of amplifying. Adding in the differential amplification circuit DA, the inverting amplification circuit IA is newly provided and the differential amplification circuit DA is caused to operate after a very small potential difference occurring between the bit lines BL and /BL is amplified by the inverting amplification circuit IA.
    Type: Grant
    Filed: June 21, 2000
    Date of Patent: October 16, 2001
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Hironori Iga
  • Input buffer for semiconductor device
    Patent number: 6124738
    Abstract: A voltage shift circuit included in an input buffer for a semiconductor integrated circuit device converts an external reference potential to a first signal of a predetermined potential. A voltage shift circuit converts the external signal obtained by superposing a logic signal of a small amplitude on an external reference potential to a second signal obtained by superposing a complementary signal of the logic signal with small amplitude on the first signal. Differential amplifying circuit compares the potentials of the first signal and the second signal and applies a signal corresponding to the result of comparison to internal circuitry. Therefore, normal operation is ensured even when an arbitrary potential between 1.25 V to 2.9 V is applied as the external reference potential.
    Type: Grant
    Filed: November 18, 1998
    Date of Patent: September 26, 2000
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Hironori Iga