Patents by Inventor Sang Jo SEO

Sang Jo SEO 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: 10250129
    Abstract: A charge pump circuit may include a charge pump unit suitable for performing a charge pump operation until an output voltage reaches a target voltage; and a multi-stage charge sharing unit comprising first to Nth capacitors coupled in parallel between the charge pump unit and a load circuit, the multi-stage charge sharing unit being suitable for sequentially performing first to Nth charge sharing operations between the first to Nth capacitors, respectively, and the load circuit after the charge sharing operation, wherein the first to Nth charge sharing operations are mutually and exclusively performed, and N is a natural number equal to or greater than 2.
    Type: Grant
    Filed: July 11, 2016
    Date of Patent: April 2, 2019
    Assignee: SK hynix Inc.
    Inventor: Sang-Jo Seo
  • Patent number: 10122268
    Abstract: In one example, a voltage generator includes a plurality of voltage pumps, a voltage detection circuit, an oscillator, and a control circuit. The plurality of voltage pumps are configured to perform voltage pumping operations in a sequence and output a pumping voltage. The voltage detection circuit is configured to detect a voltage level of the pumping voltage and output a detection signal. The control circuit is configured to output, in response to the detection signal, a plurality of divided oscillator signals based on an oscillator signal of the oscillator, to enable a different one of the voltage pumps to begin each sequence of voltage pumping operations each time the pumping voltage is less than a threshold voltage.
    Type: Grant
    Filed: December 20, 2017
    Date of Patent: November 6, 2018
    Assignee: SK hynix Inc.
    Inventors: Hyun Sik Jeong, Sang Jo Seo, Tae Heui Kwon
  • Publication number: 20180115240
    Abstract: In one example, a voltage generator includes a plurality of voltage pumps, a voltage detection circuit, an oscillator, and a control circuit. The plurality of voltage pumps are configured to perform voltage pumping operations in a sequence and output a pumping voltage. The voltage detection circuit is configured to detect a voltage level of the pumping voltage and output a detection signal. The control circuit is configured to output, in response to the detection signal, a plurality of divided oscillator signals based on an oscillator signal of the oscillator, to enable a different one of the voltage pumps to begin each sequence of voltage pumping operations each time the pumping voltage is less than a threshold voltage.
    Type: Application
    Filed: December 20, 2017
    Publication date: April 26, 2018
    Applicant: SK hynix Inc.
    Inventors: Hyun Sik JEONG, Sang Jo SEO, Tae Heui KWON
  • Patent number: 9882470
    Abstract: In one example, a voltage generator includes a plurality of voltage pumps, a voltage detection circuit, an oscillator, and a control circuit. The plurality of voltage pumps are configured to perform voltage pumping operations in a sequence and output a pumping voltage. The voltage detection circuit is configured to detect a voltage level of the pumping voltage and output a detection signal. The control circuit is configured to output, in response to the detection signal, a plurality of divided oscillator signals based on an oscillator signal of the oscillator, to enable a different one of the voltage pumps to begin each sequence of voltage pumping operations each time the pumping voltage is less than a threshold voltage.
    Type: Grant
    Filed: December 10, 2015
    Date of Patent: January 30, 2018
    Assignee: SK hynix Inc.
    Inventors: Hyun Sik Jeong, Sang Jo Seo, Tae Heui Kwon
  • Publication number: 20170264191
    Abstract: A charge pump circuit may include a charge pump unit suitable for performing a charge pump operation until an output voltage reaches a target voltage; and a multi-stage charge sharing unit comprising first to Nth capacitors coupled in parallel between the charge pump unit and a load circuit, the multi-stage charge sharing unit being suitable for sequentially performing first to Nth charge sharing operations between the first to Nth capacitors, respectively, and the load circuit after the charge sharing operation, wherein the first to Nth charge sharing operations are mutually and exclusively performed, and N is a natural number equal to or greater than 2.
    Type: Application
    Filed: July 11, 2016
    Publication date: September 14, 2017
    Inventor: Sang-Jo SEO
  • Publication number: 20170025946
    Abstract: In one example, a voltage generator includes a plurality of voltage pumps, a voltage detection circuit, an oscillator, and a control circuit. The plurality of voltage pumps are configured to perform voltage pumping operations in a sequence and output a pumping voltage. The voltage detection circuit is configured to detect a voltage level of the pumping voltage and output a detection signal. The control circuit is configured to output, in response to the detection signal, a plurality of divided oscillator signals based on an oscillator signal of the oscillator, to enable a different one of the voltage pumps to begin each sequence of voltage pumping operations each time the pumping voltage is less than a threshold voltage.
    Type: Application
    Filed: December 10, 2015
    Publication date: January 26, 2017
    Inventors: Hyun Sik JEONG, Sang Jo SEO, Tae Heui KWON