Patents by Inventor Keum-Won HA

Keum-Won HA 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).

  • Complementary Colpitts voltage controlled oscillator with low power and low phase noise
    Patent number: 9312810
    Abstract: A complementary Colpitts voltage-controlled oscillator having the properties of low power and low phase noise are disclosed. The disclosed complementary Colpitts voltage-controlled oscillator includes: a first circuit composed as a PMOS Colpitts voltage-controlled oscillator having a first PMOS transistor, a first current source, a first capacitor, a second capacitor, and a first inductor but with the first inductor removed; a second circuit composed as an NMOS Colpitts voltage-controlled oscillator having a first NMOS transistor, a second current source, a third capacitor, a fourth capacitor, and a second inductor but with the second inductor removed; and a first transformer and a second transformer arranged between the first circuit and the second circuit.
    Type: Grant
    Filed: December 28, 2014
    Date of Patent: April 12, 2016
    Assignee: Chung-Ang University Industry-Academy Cooperation Foundation
    Inventors: Dong-Hyun Baek, Keum-Won Ha, Hyuk Ryu, Jin-Hyeon Lee, Jeong-Geun Kim
  • COMPLEMENTARY COLPITTS VOLTAGE CONTROLLED OSCILLATOR WITH LOW POWER AND LOW PHASE NOISE
    Publication number: 20150244319
    Abstract: A complementary Colpitts voltage-controlled oscillator having the properties of low power and low phase noise are disclosed. The disclosed complementary Colpitts voltage-controlled oscillator includes: a first circuit composed as a PMOS Colpitts voltage-controlled oscillator having a first PMOS transistor, a first current source, a first capacitor, a second capacitor, and a first inductor but with the first inductor removed; a second circuit composed as an NMOS Colpitts voltage-controlled oscillator having a first NMOS transistor, a second current source, a third capacitor, a fourth capacitor, and a second inductor but with the second inductor removed; and a first transformer and a second transformer arranged between the first circuit and the second circuit.
    Type: Application
    Filed: December 28, 2014
    Publication date: August 27, 2015
    Inventors: Dong-Hyun BAEK, Keum-Won HA, Hyuk RYU, Jin-Hyeon LEE, Jeong-Geun KIM