Patents by Inventor Ramana M. MALLADI

Ramana M. MALLADI 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).

  • Digital phase locked loop for low jitter applications
    Patent number: 10958276
    Abstract: A phase locked loop circuit is disclosed. The phase locked loop circuit includes a ring oscillator. The phase locked loop circuit also includes a digital path including a digital phase detector. The phase locked loop circuit further includes an analog path including a linear phase detector. Additionally, the phase locked loop circuit includes a feedback path connecting an output of the ring oscillator to an input of the digital path and an input of the analog path. The digital path and the analog path are parallel paths. The digital path provides a digital tuning signal the ring oscillator that digitally controls a frequency of the ring oscillator. The analog path provides an analog tuning signal the ring oscillator that continuously controls the frequency of the ring oscillator.
    Type: Grant
    Filed: January 3, 2020
    Date of Patent: March 23, 2021
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Jingdong Deng, Rupert Shiu Chung Ho, David Flye, Zhenrong Jin, Ramana M. Malladi
  • Digital phase locked loop for low jitter applications
    Patent number: 10693471
    Abstract: A phase locked loop circuit is disclosed. The phase locked loop circuit includes a ring oscillator. The phase locked loop circuit also includes a digital path including a digital phase detector. The phase locked loop circuit further includes an analog path including a linear phase detector. Additionally, the phase locked loop circuit includes a feedback path connecting an output of the ring oscillator to an input of the digital path and an input of the analog path. The digital path and the analog path are parallel paths. The digital path provides a digital tuning signal the ring oscillator that digitally controls a frequency of the ring oscillator. The analog path provides an analog tuning signal the ring oscillator that continuously controls the frequency of the ring oscillator.
    Type: Grant
    Filed: July 10, 2018
    Date of Patent: June 23, 2020
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Jingdong Deng, Rupert Shiu Chung Ho, David Flye, Zhenrong Jin, Ramana M. Malladi
  • Digital phase locked loop for low jitter applications
    Patent number: 10686452
    Abstract: A phase locked loop circuit is disclosed. The phase locked loop circuit includes a ring oscillator. The phase locked loop circuit also includes a digital path including a digital phase detector. The phase locked loop circuit further includes an analog path including a linear phase detector. Additionally, the phase locked loop circuit includes a feedback path connecting an output of the ring oscillator to an input of the digital path and an input of the analog path. The digital path and the analog path are parallel paths. The digital path provides a digital tuning signal the ring oscillator that digitally controls a frequency of the ring oscillator. The analog path provides an analog tuning signal the ring oscillator that continuously controls the frequency of the ring oscillator.
    Type: Grant
    Filed: June 20, 2018
    Date of Patent: June 16, 2020
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Jingdong Deng, Rupert Shiu Chung Ho, David Flye, Zhenrong Jin, Ramana M. Malladi
  • DIGITAL PHASE LOCKED LOOP FOR LOW JITTER APPLICATIONS
    Publication number: 20200145012
    Abstract: A phase locked loop circuit is disclosed. The phase locked loop circuit includes a ring oscillator. The phase locked loop circuit also includes a digital path including a digital phase detector. The phase locked loop circuit further includes an analog path including a linear phase detector. Additionally, the phase locked loop circuit includes a feedback path connecting an output of the ring oscillator to an input of the digital path and an input of the analog path. The digital path and the analog path are parallel paths. The digital path provides a digital tuning signal the ring oscillator that digitally controls a frequency of the ring oscillator. The analog path provides an analog tuning signal the ring oscillator that continuously controls the frequency of the ring oscillator.
    Type: Application
    Filed: January 3, 2020
    Publication date: May 7, 2020
    Inventors: Jingdong DENG, Rupert Shiu Chung HO, David FLYE, Zhenrong JIN, Ramana M. MALLADI
  • Digital phase locked loop for low jitter applications
    Patent number: 10615806
    Abstract: A phase locked loop circuit is disclosed. The phase locked loop circuit includes a ring oscillator. The phase locked loop circuit also includes a digital path including a digital phase detector. The phase locked loop circuit further includes an analog path including a linear phase detector. Additionally, the phase locked loop circuit includes a feedback path connecting an output of the ring oscillator to an input of the digital path and an input of the analog path. The digital path and the analog path are parallel paths. The digital path provides a digital tuning signal the ring oscillator that digitally controls a frequency of the ring oscillator. The analog path provides an analog tuning signal the ring oscillator that continuously controls the frequency of the ring oscillator.
    Type: Grant
    Filed: May 31, 2018
    Date of Patent: April 7, 2020
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Jingdong Deng, Rupert Shiu Chung Ho, David Flye, Zhenrong Jin, Ramana M. Malladi
  • Digital phase locked loop for low jitter applications
    Patent number: 10566981
    Abstract: A phase locked loop circuit is disclosed. The phase locked loop circuit includes a ring oscillator. The phase locked loop circuit also includes a digital path including a digital phase detector. The phase locked loop circuit further includes an analog path including a linear phase detector. Additionally, the phase locked loop circuit includes a feedback path connecting an output of the ring oscillator to an input of the digital path and an input of the analog path. The digital path and the analog path are parallel paths. The digital path provides a digital tuning signal the ring oscillator that digitally controls a frequency of the ring oscillator. The analog path provides an analog tuning signal the ring oscillator that continuously controls the frequency of the ring oscillator.
    Type: Grant
    Filed: October 5, 2018
    Date of Patent: February 18, 2020
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Jingdong Deng, Rupert Shiu Chung Ho, David Flye, Zhenrong Jin, Ramana M. Malladi
  • DIGITAL PHASE LOCKED LOOP FOR LOW JITTER APPLICATIONS
    Publication number: 20190036534
    Abstract: A phase locked loop circuit is disclosed. The phase locked loop circuit includes a ring oscillator. The phase locked loop circuit also includes a digital path including a digital phase detector. The phase locked loop circuit further includes an analog path including a linear phase detector. Additionally, the phase locked loop circuit includes a feedback path connecting an output of the ring oscillator to an input of the digital path and an input of the analog path. The digital path and the analog path are parallel paths. The digital path provides a digital tuning signal the ring oscillator that digitally controls a frequency of the ring oscillator. The analog path provides an analog tuning signal the ring oscillator that continuously controls the frequency of the ring oscillator.
    Type: Application
    Filed: October 5, 2018
    Publication date: January 31, 2019
    Inventors: Jingdong DENG, Rupert Shiu Chung HO, David FLYE, Zhenrong JIN, Ramana M. MALLADI
  • Digital phase locked loop for low jitter applications
    Patent number: 10164647
    Abstract: A phase locked loop circuit is disclosed. The phase locked loop circuit includes a ring oscillator. The phase locked loop circuit also includes a digital path including a digital phase detector. The phase locked loop circuit further includes an analog path including a linear phase detector. Additionally, the phase locked loop circuit includes a feedback path connecting an output of the ring oscillator to an input of the digital path and an input of the analog path. The digital path and the analog path are parallel paths. The digital path provides a digital tuning signal the ring oscillator that digitally controls a frequency of the ring oscillator. The analog path provides an analog tuning signal the ring oscillator that continuously controls the frequency of the ring oscillator.
    Type: Grant
    Filed: October 20, 2017
    Date of Patent: December 25, 2018
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Jingdong Deng, Rupert Shiu Chung Ho, David Flye, Zhenrong Jin, Ramana M. Malladi
  • DIGITAL PHASE LOCKED LOOP FOR LOW JITTER APPLICATIONS
    Publication number: 20180316357
    Abstract: A phase locked loop circuit is disclosed. The phase locked loop circuit includes a ring oscillator. The phase locked loop circuit also includes a digital path including a digital phase detector. The phase locked loop circuit further includes an analog path including a linear phase detector. Additionally, the phase locked loop circuit includes a feedback path connecting an output of the ring oscillator to an input of the digital path and an input of the analog path. The digital path and the analog path are parallel paths. The digital path provides a digital tuning signal the ring oscillator that digitally controls a frequency of the ring oscillator. The analog path provides an analog tuning signal the ring oscillator that continuously controls the frequency of the ring oscillator.
    Type: Application
    Filed: June 20, 2018
    Publication date: November 1, 2018
    Inventors: Jingdong DENG, Chung S. HO, David FLYE, Zhenrong JIN, Ramana M. MALLADI
  • DIGITAL PHASE LOCKED LOOP FOR LOW JITTER APPLICATIONS
    Publication number: 20180316358
    Abstract: A phase locked loop circuit is disclosed. The phase locked loop circuit includes a ring oscillator. The phase locked loop circuit also includes a digital path including a digital phase detector. The phase locked loop circuit further includes an analog path including a linear phase detector. Additionally, the phase locked loop circuit includes a feedback path connecting an output of the ring oscillator to an input of the digital path and an input of the analog path. The digital path and the analog path are parallel paths. The digital path provides a digital tuning signal the ring oscillator that digitally controls a frequency of the ring oscillator. The analog path provides an analog tuning signal the ring oscillator that continuously controls the frequency of the ring oscillator.
    Type: Application
    Filed: July 10, 2018
    Publication date: November 1, 2018
    Inventors: Jingdong Deng, Chung S. Ho, David FLYE, Zhenrong JIN, Ramana M. MALLADI
  • Digital phase locked loop for low jitter applications
    Patent number: 10103739
    Abstract: A phase locked loop circuit is disclosed. The phase locked loop circuit includes a ring oscillator. The phase locked loop circuit also includes a digital path including a digital phase detector. The phase locked loop circuit further includes an analog path including a linear phase detector. Additionally, the phase locked loop circuit includes a feedback path connecting an output of the ring oscillator to an input of the digital path and an input of the analog path. The digital path and the analog path are parallel paths. The digital path provides a digital tuning signal the ring oscillator that digitally controls a frequency of the ring oscillator. The analog path provides an analog tuning signal the ring oscillator that continuously controls the frequency of the ring oscillator.
    Type: Grant
    Filed: September 8, 2017
    Date of Patent: October 16, 2018
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Jingdong Deng, Chung S. Ho, David Flye, Zhenrong Jin, Ramana M. Malladi
  • DIGITAL PHASE LOCKED LOOP FOR LOW JITTER APPLICATIONS
    Publication number: 20180278258
    Abstract: A phase locked loop circuit is disclosed. The phase locked loop circuit includes a ring oscillator. The phase locked loop circuit also includes a digital path including a digital phase detector. The phase locked loop circuit further includes an analog path including a linear phase detector. Additionally, the phase locked loop circuit includes a feedback path connecting an output of the ring oscillator to an input of the digital path and an input of the analog path. The digital path and the analog path are parallel paths. The digital path provides a digital tuning signal the ring oscillator that digitally controls a frequency of the ring oscillator. The analog path provides an analog tuning signal the ring oscillator that continuously controls the frequency of the ring oscillator.
    Type: Application
    Filed: May 31, 2018
    Publication date: September 27, 2018
    Inventors: Jingdong Deng, Chung S. Ho, David FLYE, Zhenrong JIN, Ramana M. MALLADI
  • Digital phase locked loop for low jitter applications
    Patent number: 10084460
    Abstract: A phase locked loop circuit is disclosed. The phase locked loop circuit includes a ring oscillator. The phase locked loop circuit also includes a digital path including a digital phase detector. The phase locked loop circuit further includes an analog path including a linear phase detector. Additionally, the phase locked loop circuit includes a feedback path connecting an output of the ring oscillator to an input of the digital path and an input of the analog path. The digital path and the analog path are parallel paths. The digital path provides a digital tuning signal the ring oscillator that digitally controls a frequency of the ring oscillator. The analog path provides an analog tuning signal the ring oscillator that continuously controls the frequency of the ring oscillator.
    Type: Grant
    Filed: November 22, 2017
    Date of Patent: September 25, 2018
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Jingdong Deng, Chung S. Ho, David Flye, Zhenrong Jin, Ramana M. Malladi
  • Digital phase locked loop for low jitter applications
    Patent number: 10063243
    Abstract: A phase locked loop circuit is disclosed. The phase locked loop circuit includes a ring oscillator. The phase locked loop circuit also includes a digital path including a digital phase detector. The phase locked loop circuit further includes an analog path including a linear phase detector. Additionally, the phase locked loop circuit includes a feedback path connecting an output of the ring oscillator to an input of the digital path and an input of the analog path. The digital path and the analog path are parallel paths. The digital path provides a digital tuning signal the ring oscillator that digitally controls a frequency of the ring oscillator. The analog path provides an analog tuning signal the ring oscillator that continuously controls the frequency of the ring oscillator.
    Type: Grant
    Filed: August 4, 2017
    Date of Patent: August 28, 2018
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Jingdong Deng, Chung S. Ho, David Flye, Zhenrong Jin, Ramana M. Malladi
  • DIGITAL PHASE LOCKED LOOP FOR LOW JITTER APPLICATIONS
    Publication number: 20180083640
    Abstract: A phase locked loop circuit is disclosed. The phase locked loop circuit includes a ring oscillator. The phase locked loop circuit also includes a digital path including a digital phase detector. The phase locked loop circuit further includes an analog path including a linear phase detector. Additionally, the phase locked loop circuit includes a feedback path connecting an output of the ring oscillator to an input of the digital path and an input of the analog path. The digital path and the analog path are parallel paths. The digital path provides a digital tuning signal the ring oscillator that digitally controls a frequency of the ring oscillator. The analog path provides an analog tuning signal the ring oscillator that continuously controls the frequency of the ring oscillator.
    Type: Application
    Filed: November 22, 2017
    Publication date: March 22, 2018
    Inventors: Jingdong DENG, Chung S. HO, David FLYE, Zhenrong JIN, Ramana M. MALLADI
  • Digital phase locked loop for low jitter applications
    Patent number: 9917591
    Abstract: A phase locked loop circuit is disclosed. The phase locked loop circuit includes a ring oscillator. The phase locked loop circuit also includes a digital path including a digital phase detector. The phase locked loop circuit further includes an analog path including a linear phase detector. Additionally, the phase locked loop circuit includes a feedback path connecting an output of the ring oscillator to an input of the digital path and an input of the analog path. The digital path and the analog path are parallel paths. The digital path provides a digital tuning signal the ring oscillator that digitally controls a frequency of the ring oscillator. The analog path provides an analog tuning signal the ring oscillator that continuously controls the frequency of the ring oscillator.
    Type: Grant
    Filed: August 26, 2016
    Date of Patent: March 13, 2018
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Jingdong Deng, Chung S. Ho, David Flye, Zhenrong Jin, Ramana M. Malladi
  • Digital phase locked loop for low jitter applications
    Patent number: 9906228
    Abstract: A phase locked loop circuit is disclosed. The phase locked loop circuit includes a ring oscillator. The phase locked loop circuit also includes a digital path including a digital phase detector. The phase locked loop circuit further includes an analog path including a linear phase detector. Additionally, the phase locked loop circuit includes a feedback path connecting an output of the ring oscillator to an input of the digital path and an input of the analog path. The digital path and the analog path are parallel paths. The digital path provides a digital tuning signal the ring oscillator that digitally controls a frequency of the ring oscillator. The analog path provides an analog tuning signal the ring oscillator that continuously controls the frequency of the ring oscillator.
    Type: Grant
    Filed: August 26, 2016
    Date of Patent: February 27, 2018
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Jingdong Deng, Chung S. Ho, David Flye, Zhenrong Jin, Ramana M. Malladi
  • DIGITAL PHASE LOCKED LOOP FOR LOW JITTER APPLICATIONS
    Publication number: 20180048321
    Abstract: A phase locked loop circuit is disclosed. The phase locked loop circuit includes a ring oscillator. The phase locked loop circuit also includes a digital path including a digital phase detector. The phase locked loop circuit further includes an analog path including a linear phase detector. Additionally, the phase locked loop circuit includes a feedback path connecting an output of the ring oscillator to an input of the digital path and an input of the analog path. The digital path and the analog path are parallel paths. The digital path provides a digital tuning signal the ring oscillator that digitally controls a frequency of the ring oscillator. The analog path provides an analog tuning signal the ring oscillator that continuously controls the frequency of the ring oscillator.
    Type: Application
    Filed: October 20, 2017
    Publication date: February 15, 2018
    Inventors: Jingdong DENG, Chung S. HO, David FLYE, Zhenrong JIN, Ramana M. MALLADI
  • DIGITAL PHASE LOCKED LOOP FOR LOW JITTER APPLICATIONS
    Publication number: 20170373695
    Abstract: A phase locked loop circuit is disclosed. The phase locked loop circuit includes a ring oscillator. The phase locked loop circuit also includes a digital path including a digital phase detector. The phase locked loop circuit further includes an analog path including a linear phase detector. Additionally, the phase locked loop circuit includes a feedback path connecting an output of the ring oscillator to an input of the digital path and an input of the analog path. The digital path and the analog path are parallel paths. The digital path provides a digital tuning signal the ring oscillator that digitally controls a frequency of the ring oscillator. The analog path provides an analog tuning signal the ring oscillator that continuously controls the frequency of the ring oscillator.
    Type: Application
    Filed: September 8, 2017
    Publication date: December 28, 2017
    Inventors: Jingdong Deng, Chung S. Ho, David FLYE, Zhenrong JIN, Ramana M. MALLADI
  • DIGITAL PHASE LOCKED LOOP FOR LOW JITTER APPLICATIONS
    Publication number: 20170338827
    Abstract: A phase locked loop circuit is disclosed. The phase locked loop circuit includes a ring oscillator. The phase locked loop circuit also includes a digital path including a digital phase detector. The phase locked loop circuit further includes an analog path including a linear phase detector. Additionally, the phase locked loop circuit includes a feedback path connecting an output of the ring oscillator to an input of the digital path and an input of the analog path. The digital path and the analog path are parallel paths. The digital path provides a digital tuning signal the ring oscillator that digitally controls a frequency of the ring oscillator. The analog path provides an analog tuning signal the ring oscillator that continuously controls the frequency of the ring oscillator.
    Type: Application
    Filed: August 4, 2017
    Publication date: November 23, 2017
    Inventors: Jingdong Deng, Chung S. Ho, David FLYE, Zhenrong JIN, Ramana M. MALLADI