Patents by Inventor Shinji Okumoto

Shinji Okumoto 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).

  • Internal voltage step-down circuit
    Patent number: 6768370
    Abstract: A voltage step-down circuit (100) that may provide an internal voltage (VINT) by reducing an external power source (VDD) has been disclosed. A voltage step-down circuit (100) may include a voltage step-down portion (10) and a compensation current source portion (20). Voltage step-down portion (10) may compare a reference voltage (VREF) with an internal voltage (VINT) and control an output current (I0) accordingly. An internal circuit (1) connected to receive internal voltage (VINT) may transition from a standby state to an active state in accordance with an activation signal. Compensation current source portion (20) may provide a compensation current (Ic) when internal circuit (1) is in a standby state. In this way, voltage step-down portion (10) may be biased to provide sufficient output current (I0) so that a response time may be improved and variations in internal voltage (VINT) may be reduced.
    Type: Grant
    Filed: October 29, 2002
    Date of Patent: July 27, 2004
    Assignee: NEC Electronics Corporation
    Inventors: Hiroyuki Takahashi, Nobumitsu Yano, Shinji Okumoto
  • Internal voltage step-down circuit
    Publication number: 20030081436
    Abstract: A voltage step-down circuit (100) that may provide an internal voltage (VINT) by reducing an external power source (VDD) has been disclosed. A voltage step-down circuit (100) may include a voltage step-down portion (10) and a compensation current source portion (20). Voltage step-down portion (10) may compare a reference voltage (VREF) with an internal voltage (VINT) and control an output current (I0) accordingly. An internal circuit (1) connected to receive internal voltage (VINT) may transition from a standby state to an active state in accordance with an activation signal. Compensation current source portion (20) may provide a compensation current (Ic) when internal circuit (1) is in a standby state. In this way, voltage step-down portion (10) may be biased to provide sufficient output current (I0) so that a response time may be improved and variations in internal voltage (VINT) may be reduced.
    Type: Application
    Filed: October 29, 2002
    Publication date: May 1, 2003
    Inventors: Hiroyuki Takahashi, Nobumitsu Yano, Shinji Okumoto