Patents by Inventor Ryan T. Freese

Ryan T. Freese 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: 11854652
    Abstract: A sense amplifier is biased to reduce leakage current equalize matched transistor bias during an idle state. A first read select transistor couples a true bit line and a sense amplifier true (SAT) signal line and a second read select transistor couples a complement bit line and a sense amplifier complement (SAC) signal line. The SAT and SAC signal lines are precharged during a precharge state. An equalization circuit shorts the SAT and SAC signal lines during the precharge state. A differential sense amplifier circuit for latching the memory cell value is coupled to the SAT signal line and the SAC signal line. The precharge circuit and the differential sense amplifier circuit are turned off during a sleep state to cause the SAT and SAC signal lines to float. A sleep circuit shorts the SAT and SAC signal lines during the sleep state.
    Type: Grant
    Filed: November 10, 2022
    Date of Patent: December 26, 2023
    Assignee: Advanced Micro Devices, Inc.
    Inventors: Russell J. Schreiber, Ryan T. Freese, Eric W. Busta
  • Publication number: 20230071807
    Abstract: A sense amplifier is biased to reduce leakage current equalize matched transistor bias during an idle state. A first read select transistor couples a true bit line and a sense amplifier true (SAT) signal line and a second read select transistor couples a complement bit line and a sense amplifier complement (SAC) signal line. The SAT and SAC signal lines are precharged during a precharge state. An equalization circuit shorts the SAT and SAC signal lines during the precharge state. A differential sense amplifier circuit for latching the memory cell value is coupled to the SAT signal line and the SAC signal line. The precharge circuit and the differential sense amplifier circuit are turned off during a sleep state to cause the SAT and SAC signal lines to float. A sleep circuit shorts the SAT and SAC signal lines during the sleep state.
    Type: Application
    Filed: November 10, 2022
    Publication date: March 9, 2023
    Inventors: Russell J. Schreiber, Ryan T. Freese, Eric W. Busta
  • Patent number: 11514956
    Abstract: A sense amplifier is biased to reduce leakage current equalize matched transistor bias during an idle state. A first read select transistor couples a true bit line and a sense amplifier true (SAT) signal line and a second read select transistor couples a complement bit line and a sense amplifier complement (SAC) signal line. The SAT and SAC signal lines are precharged during a precharge state. An equalization circuit shorts the SAT and SAC signal lines during the precharge state. A differential sense amplifier circuit for latching the memory cell value is coupled to the SAT signal line and the SAC signal line. The precharge circuit and the differential sense amplifier circuit are turned off during a sleep state to cause the SAT and SAC signal lines to float. A sleep circuit shorts the SAT and SAC signal lines during the sleep state.
    Type: Grant
    Filed: December 24, 2020
    Date of Patent: November 29, 2022
    Assignee: Advanced Micro Devices, Inc.
    Inventors: Russell J. Schreiber, Ryan T. Freese, Eric W. Busta
  • Publication number: 20220208234
    Abstract: A sense amplifier is biased to reduce leakage current equalize matched transistor bias during an idle state. A first read select transistor couples a true bit line and a sense amplifier true (SAT) signal line and a second read select transistor couples a complement bit line and a sense amplifier complement (SAC) signal line. The SAT and SAC signal lines are precharged during a precharge state. An equalization circuit shorts the SAT and SAC signal lines during the precharge state. A differential sense amplifier circuit for latching the memory cell value is coupled to the SAT signal line and the SAC signal line. The precharge circuit and the differential sense amplifier circuit are turned off during a sleep state to cause the SAT and SAC signal lines to float. A sleep circuit shorts the SAT and SAC signal lines during the sleep state.
    Type: Application
    Filed: December 24, 2020
    Publication date: June 30, 2022
    Inventors: Russell J. Schreiber, Ryan T. Freese, Eric W. Busta
  • Patent number: 7463537
    Abstract: A domino SRAM global bit select circuit provides an interface between dual global read and write bit line pairs to a “local bit select” circuit.
    Type: Grant
    Filed: November 1, 2007
    Date of Patent: December 9, 2008
    Assignee: International Business Machines Corporation
    Inventors: Yuen H. Chan, Ryan T. Freese, Antonio R. Pelella, Arthur D. Tuminaro
  • Patent number: 7336546
    Abstract: A domino SRAM global bit select circuit provides an interface between dual global read and write bit line pairs to a “local bit select” circuit.
    Type: Grant
    Filed: February 9, 2005
    Date of Patent: February 26, 2008
    Assignee: International Business Machines Corporation
    Inventors: Yuen H. Chan, Ryan T. Freese, Antonio R. Pelella, Arthur D. Tuminaro
  • Patent number: 7293209
    Abstract: A programmable delay circuit that delays the C2 clock signal by a variable amount that allows the output from the L1 latch to be captured even when there is a large delta between the L1 latch and its L2 latch. This allows the C2 signal to be adjusted within the system dependent upon the amount of cycle steal is needed. The C2 clock delay is inhibited during scan operation to prevent glitches and the trailing edge of the delayed C2 is controlled to maintain a constant C2 duty cycle.
    Type: Grant
    Filed: February 9, 2005
    Date of Patent: November 6, 2007
    Assignee: International Business Machines Corporation
    Inventors: Yuen H. Chan, Ryan T. Freese, Antonio R. Pelella
  • Patent number: 7272030
    Abstract: A domino SRAM array restore pulse generation system launches the work decode line by the same local clock as the restore pulse, thus eliminating any race issues with the word line select. This system allows the global bit select (or column select) to have fast activation by releasing the reset signal (with the earliest arriving array clock, ck1), while guaranteeing almost perfect tracking with the bit decode system. This allows for the widest possible write window; earliest release of the pre-charge in the global column select, and resetting only after the bit decode system is deactivated.
    Type: Grant
    Filed: October 30, 2006
    Date of Patent: September 18, 2007
    Assignee: International Business Machines Corporation
    Inventors: Yuen H. Chan, Ryan T. Freese, Antonio R. Pelella, Uma Srinivasan, Arthur D. Tuminaro, Jatinder K. Wadhwa
  • Patent number: 7170774
    Abstract: A domino SRAM array restore pulse generation system launches the word decode line by the same local clock as the restore pulse, thus eliminating any race issues with the word line select. This system allows the global bit select (or column select) to have fast activation by releasing the reset signal (with the earliest arriving array clock, ckl), while guaranteeing almost perfect tracking with the bit decode system. This allows for the widest possible write window; earliest release of the pre-charge in the global column select, and resetting only after the bit decode system is deactivated.
    Type: Grant
    Filed: February 9, 2005
    Date of Patent: January 30, 2007
    Assignee: International Business Machines Corporation
    Inventors: Yuen H. Chan, Ryan T. Freese, Antonio R. Pelella, Uma Srinivasan, Arthur D. Tuminaro, Jatinder K. Wadhwa
  • Patent number: 7113433
    Abstract: A domino SRAM is provided with active pull-up PFET devices that overwhelm “slow to write but very fast to read” cells and allow the cells to recover from timing mismatch situations. This approach allows the traditional “bit select” clamp to actively control the “local select” through “wired-or” PFET pull-up transistors. Separate read and write global “bit line” pairs allow the read and write performance to be optimized independently.
    Type: Grant
    Filed: February 9, 2005
    Date of Patent: September 26, 2006
    Assignee: International Business Machines Corporation
    Inventors: Yuen H. Chan, Ryan T. Freese, Antonio R. Pelella, Arthur D. Tuminaro