Patents by Inventor John A. Fifield

John A. Fifield 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: 7847605
    Abstract: An integrated circuit that includes at least one tunneling device voltage detection circuit for generating a trigger flag signal. The tunneling device voltage detection circuit includes first and second voltage dividers receiving a supply voltage and having corresponding respective first and second internal node output voltages. The first and second voltage dividers are configured so the first output voltage is linear relative to the supply voltage and so that the second output voltage is nonlinear relative to the supply voltage. As the supply voltage ramps up, the profiles of the first and second output voltage cross at a particular voltage. An operational amplifier circuit senses when the first and second output voltages become equal and, in response thereto, outputs a trigger signal that indicates that the supply voltage has reached a certain level.
    Type: Grant
    Filed: September 30, 2008
    Date of Patent: December 7, 2010
    Assignee: International Business Machines Corporation
    Inventors: Wagdi W. Abadeer, Jeffrey S. Brown, Albert M. Chu, John A. Fifield
  • Patent number: 7825469
    Abstract: The present disclosure is directed to a CMOS active pixel sensor that compensates for variations in a threshold voltage of a source follower contained therein. A structure in accordance with an embodiment includes: a replica source follower transistor; a system for creating a current in said replica source follower transistor such that a gate-source voltage of said replica source follower is substantially equal to a threshold voltage of said replica source follower; and a current mirror for biasing the isolation source follower transistor at a same current density as the replica source follower transistor.
    Type: Grant
    Filed: September 5, 2007
    Date of Patent: November 2, 2010
    Assignee: International Business Machines Corporation
    Inventors: Wagdi W. Abadeer, John A. Fifield
  • Patent number: 7772918
    Abstract: An apparatus and method for a regulated voltage boost charge pump for an integrated circuit (IC) device. The charge pump generally includes a plurality of switching networks and a lift capacitor that are intermittently coupled to an output capacitor or to a regulating transistor, a differential error amplifier biasing a gate terminal of the transistor, and a controller configured to alternate states of switches in the switching networks in a pre-selected timing relationship with a clock signal of the IC device.
    Type: Grant
    Filed: April 16, 2008
    Date of Patent: August 10, 2010
    Assignee: International Business Machines Corporation
    Inventors: John A. Fifield, Bradford Hunter, Todd M. Rasmus, Michael A. Sorna, Daniel W. Storaksa
  • Patent number: 7737766
    Abstract: A two stage voltage boost circuit, IC and design structure are disclosed for boosting a supply voltage using gate control circuitry to reduce gate oxide stress, thus allowing lower voltage level FETs to be used. The voltage boost circuit may include a first stage for boosting the supply voltage to a first boosted voltage; a first passgate coupled to the first stage; a first gate control circuit for generating an on-state gate voltage level for the first passgate adjusted to reduce gate oxide voltage stress on the passgate; a second stage for boosting the first boosted voltage to a second boosted voltage; a second passgate coupled to the second stage, and a second gate control circuit for generating an on-state gate voltage level for the second passgate adjusted to reduce gate oxide voltage stress on the second passgate.
    Type: Grant
    Filed: February 15, 2008
    Date of Patent: June 15, 2010
    Assignee: International Business Machines Corporation
    Inventors: Jeffrey H. Dreibelbis, John A. Fifield
  • Patent number: 7733161
    Abstract: A voltage boost system, IC and design structure are disclosed for boosting a supply voltage while preventing forward biasing of n-well structures. The voltage boost system may include a first voltage boost circuit producing a first boosted voltage using at least one voltage boost sub-circuit, each of the at least one voltage boost sub-circuit having an output passgate in an n-well; a second voltage boost circuit producing a second boosted voltage, the n-well of each output passgate being biased using the second boosted voltage, wherein the second boosted voltage is greater than the first boosted voltage. Voltage boost sub-circuits may use gate control circuitry to reduce gate oxide stress, thus allowing lower voltage level FETs to be used.
    Type: Grant
    Filed: February 15, 2008
    Date of Patent: June 8, 2010
    Assignee: International Business Machines Corporation
    Inventors: Jeffrey H. Dreibelbis, John A. Fifield
  • Patent number: 7716619
    Abstract: A keeper device design structure for dynamic logic used in integrated circuit designs includes a first keeper path statically coupled to a dynamic data path, the first keeper path configured to prevent false discharge of the dynamic data path during an evaluation thereof, and a second keeper path selectively coupled to the dynamic data path. The second keeper path is configured to maintain the dynamic data path at a nominal precharge level prior to an evaluation thereof, wherein the second keeper path is decoupled from the dynamic data path during the evaluation.
    Type: Grant
    Filed: September 6, 2007
    Date of Patent: May 11, 2010
    Assignee: International Business Machines Corporation
    Inventors: Geordie Braceras, John Fifield, Harold Pilo
  • Patent number: 7710195
    Abstract: A two stage voltage boost circuit, IC and design structure are disclosed for boosting a supply voltage using gate control circuitry to reduce gate oxide stress, thus allowing lower voltage level FETs to be used. The voltage boost circuit may include a first stage for boosting the supply voltage to a first boosted voltage and a second stage for boosting the first boosted voltage to a second boosted voltage. Each stage may include a passgate and a gate control circuit for generating an on-state gate voltage level for the respective passgate adjusted to reduce gate oxide voltage stress on the passgate. The circuit may also include a precharge circuit for coupling a voltage on a high node of the second stage to a gate node of a precharge transistor thereof for disabling the precharge transistor and preventing leakage back to a power supply voltage.
    Type: Grant
    Filed: February 15, 2008
    Date of Patent: May 4, 2010
    Assignee: International Business Machines Corporation
    Inventors: Jeffrey H. Dreibelbis, John A. Fifield
  • Patent number: 7687883
    Abstract: An antifuse device (120) that includes a bias element (124) and an programmable antifuse element (128) arranged in series with one another so as to form a voltage divider having an output node (F) located between the bias and antifuse elements. When the antifuse device is in its unprogrammed state, each of the bias element and antifuse element is non-conductive. When the antifuse device is in its programmed state, the bias element remains non-conductive, but the antifuse element is conductive. The difference in the resistance of the antifuse element between its unprogrammed state and programmed state causes the difference in voltages seen at the output node to be on the order of hundreds of mili-volts when a voltage of 1 V is applied across the antifuse device. This voltage difference is so high that it can be readily sensed using a simple sensing circuit (228).
    Type: Grant
    Filed: January 26, 2007
    Date of Patent: March 30, 2010
    Assignee: International Business Machines Corporation
    Inventors: John A. Fifield, Wagdi W. Abadeer, William R. Tonti
  • Patent number: 7675789
    Abstract: Aspects of the invention relate to a programmable heavy-ion sensing device for accelerated DRAM soft error detection. Design of a DRAM-based alpha particle sensing apparatus is preferred to be used as an accelerated on-chip SER test vehicle. The sensing apparatus is provided with programmable sensing margin, refresh rate, and supply voltage to achieve various degree of SER sensitivity. In addition, a dual-mode DRAM array is proposed so that at least a portion of the array can be used to monitor high-energy particle activities during soft-error detection (SED) mode.
    Type: Grant
    Filed: June 6, 2008
    Date of Patent: March 9, 2010
    Assignee: International Business Machines Corporation
    Inventors: Howard H. Chen, John A. Fifield, Louis L. Hsu, Henry H. K. Tang
  • Publication number: 20100014373
    Abstract: An apparatus for regulating eFUSE programming current includes a current control generator receiving an input reference current through a first current path of reference fuses, the input reference current proportional to a desired eFUSE programming current; a second current path including a reference programming FET and a second group of reference fuses; and a voltage comparator coupled to a gate terminal of the reference programming FET so as to adjust the gate voltage of the reference programming FET to equalize a first voltage across the first current path with a second voltage across the second current path. The gate voltage of the reference programming FET is an output of the current control generator, coupled to corresponding gates of one or more selected programming devices of an eFUSE array such that the selected programming devices source the desired eFUSE programming current to a selected eFUSE to be programmed.
    Type: Application
    Filed: July 21, 2008
    Publication date: January 21, 2010
    Inventors: Darren L. Anand, John A. Fifield, John R. Goss
  • Publication number: 20100001788
    Abstract: A system to evaluate charge pump output may include a comparator to compare a charge pump output voltage to a reference voltage to generate a comparison result. The system may also include a divider to divide down a clock signal. The system may further include a logical conjunction unit to operate on the comparison result and the divided down clock signal.
    Type: Application
    Filed: July 6, 2008
    Publication date: January 7, 2010
    Inventors: John E. Barth, JR., John A. Fifield, Fadi H. Gebara, Jente B. Kuang, Michael Sperling
  • Patent number: 7642813
    Abstract: The invention includes an error correcting logic system that allows critical circuits to be hardened with only one redundant unit and without loss of circuit performance. The system provides an interconnecting gate that suppresses a fault in one of at least two redundant dynamic logic gates that feed to the interconnecting gate. The system is applicable to dynamic or static logic systems. The system prevents propagation of a fault, and addresses not only soft errors, but noise-induced errors. Also, there is provided a design structure embodied in a machine readable medium used in a design process, and which includes such error correcting logic system.
    Type: Grant
    Filed: September 6, 2007
    Date of Patent: January 5, 2010
    Assignee: International Business Machines Corporation
    Inventors: Kerry Bernstein, Philip G. Emma, John A. Fifield, Paul D. Kartschoke, William A. Klaasen, Norman J. Rohrer
  • Publication number: 20090261890
    Abstract: An apparatus and method for a regulated voltage boost charge pump for an integrated circuit (IC) device. The charge pump generally includes a plurality of switching networks and a lift capacitor that are intermittently coupled to an output capacitor or to a regulating transistor, a differential error amplifier biasing a gate terminal of the transistor, and a controller configured to alternate states of switches in the switching networks in a pre-selected timing relationship with a clock signal of the IC device.
    Type: Application
    Filed: April 16, 2008
    Publication date: October 22, 2009
    Inventors: John A. Fifield, Bradford Hunter, Todd M. Rasmus, Michael A. Sorna, Daniel W. Storaska
  • Publication number: 20090243733
    Abstract: A design structure is embodied in a machine readable medium for designing, manufacturing, or testing a design. The design structure includes a first structure for determining a non-linear characteristic of the input voltage to the output frequency response, the first design structure providing a tunneling-based current relationship with the input voltage. Also disclosed is a system and a method of implementing such structure.
    Type: Application
    Filed: March 28, 2008
    Publication date: October 1, 2009
    Inventors: Wagdi W. Abadeer, John A. Fifield, Stephen D. Wyatt
  • Publication number: 20090206917
    Abstract: A two stage voltage boost circuit, IC and design structure are disclosed for boosting a supply voltage using gate control circuitry to reduce gate oxide stress, thus allowing lower voltage level FETs to be used. The voltage boost circuit may include a first stage for boosting the supply voltage to a first boosted voltage and a second stage for boosting the first boosted voltage to a second boosted voltage. Each stage may include a passgate and a gate control circuit for generating an on-state gate voltage level for the respective passgate adjusted to reduce gate oxide voltage stress on the passgate. The circuit may also include a precharge circuit for coupling a voltage on a high node of the second stage to a gate node of a precharge transistor thereof for disabling the precharge transistor and preventing leakage back to a power supply voltage.
    Type: Application
    Filed: February 15, 2008
    Publication date: August 20, 2009
    Inventors: Jeffrey H. Dreibelbis, John A. Fifield
  • Publication number: 20090206916
    Abstract: A voltage boost system, IC and design structure are disclosed for boosting a supply voltage while preventing forward biasing of n-well structures. The voltage boost system may include a first voltage boost circuit producing a first boosted voltage using at least one voltage boost sub-circuit, each of the at least one voltage boost sub-circuit having an output passgate in an n-well; a second voltage boost circuit producing a second boosted voltage, the n-well of each output passgate being biased using the second boosted voltage, wherein the second boosted voltage is greater than the first boosted voltage. Voltage boost sub-circuits may use gate control circuitry to reduce gate oxide stress, thus allowing lower voltage level FETs to be used.
    Type: Application
    Filed: February 15, 2008
    Publication date: August 20, 2009
    Inventors: Jeffrey H. Dreibelbis, John A. Fifield
  • Publication number: 20090206915
    Abstract: A two stage voltage boost circuit, IC and design structure are disclosed for boosting a supply voltage using gate control circuitry to reduce gate oxide stress, thus allowing lower voltage level FETs to be used. The voltage boost circuit may include a first stage for boosting the supply voltage to a first boosted voltage; a first passgate coupled to the first stage; a first gate control circuit for generating an on-state gate voltage level for the first passgate adjusted to reduce gate oxide voltage stress on the passgate; a second stage for boosting the first boosted voltage to a second boosted voltage; a second passgate coupled to the second stage, and a gate control circuit for generating an on-state gate voltage level for the second passgate adjusted to reduce gate oxide voltage stress on the second pass-gate.
    Type: Application
    Filed: February 15, 2008
    Publication date: August 20, 2009
    Inventors: Jeffrey H. Dreibelbis, John A. Fifield
  • Patent number: D604432
    Type: Grant
    Filed: April 28, 2008
    Date of Patent: November 17, 2009
    Assignee: Oldcastle Architectural, Inc.
    Inventors: John A. Fifield, Brian Austin, Jason Rhees, David Skierkowski, Michael McVey
  • Patent number: D604433
    Type: Grant
    Filed: April 28, 2008
    Date of Patent: November 17, 2009
    Assignee: Oldcastle Architectural, Inc.
    Inventors: John A. Fifield, Brian Austin, Jason Rhees, David Skierkowski, Michael McVey
  • Patent number: D608915
    Type: Grant
    Filed: April 28, 2008
    Date of Patent: January 26, 2010
    Assignee: Oldcastle Architectural, Inc.
    Inventors: John A. Fifield, Brian Austin, Jason Rhees, David Skierkowski, Michael McVey