Patents by Inventor Hyun-ha Jo

Hyun-ha Jo 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).

  • Low noise reference circuit of improving frequency variation of ring oscillator
    Patent number: 8405376
    Abstract: A low noise reference voltage circuit without using an amplifier inside is capable of transforming a current IPTAT in positive proportion to absolute temperature into a voltage VPTAT in positive proportion to absolute temperature, and outputting it to a ring oscillator. The low noise reference voltage circuit improves a degradation of noise performance compared with a conventional band-gap reference voltage circuit and is in characteristic of low noise and higher PSRR.
    Type: Grant
    Filed: November 24, 2009
    Date of Patent: March 26, 2013
    Assignee: FCI Inc.
    Inventors: In-chul Hwang, Myung-woon Hwang, Je-cheol Moon, Hyun-ha Jo
  • LOW NOISE REFERENCE CIRCUIT OF IMPROVING FREQUENCY VARIATION OF RING OSCILLATOR
    Publication number: 20100134087
    Abstract: A low noise reference voltage circuit without using an amplifier inside is capable of transforming a current IPTAT in positive proportion to absolute temperature into a voltage VPTAT in positive proportion to absolute temperature, and outputting it to a ring oscillator. The low noise reference voltage circuit improves a degradation of noise performance compared with a conventional band-gap reference voltage circuit and is in characteristic of low noise and higher PSRR.
    Type: Application
    Filed: November 24, 2009
    Publication date: June 3, 2010
    Applicant: FCI INC.
    Inventors: In-chul Hwang, Myung-woon Hwang, Je-cheol Moon, Hyun-ha Jo