Patents by Inventor John Fifield
John 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).
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Patent number: 10971996Abstract: A charge pump circuit includes a charge pump configured to increase a voltage of an input signal to generate a voltage-boosted input signal, output the voltage-boosted input signal in response to a determination that the voltage-boosted input signal is greater than or equal to a threshold, and connect the charge pump to a supply voltage to pre-charge the charge pump in response to a determination that the voltage-boosted input signal is less than the threshold. The charge pump circuit includes bandgap reference generator configured to receive the voltage-boosted input signal and output, based on the voltage-boosted input signal, a voltage reference signal to a device that operates in accordance with the supply voltage.Type: GrantFiled: June 1, 2020Date of Patent: April 6, 2021Assignee: Marvell Asia Pte., Ltd.Inventors: Eric D. Hunt-Schroeder, John A. Fifield, Dale E. Pontius
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Patent number: 10826489Abstract: The present disclosure relates to a structure including a voltage selection circuit which includes a first device and a second device, the voltage selection circuit is configured to output a higher voltage of a first supply voltage and a second supply voltage through one of the first device and the second device, and a voltage difference between the first supply voltage and the second supply voltage is less than a threshold voltage.Type: GrantFiled: June 6, 2019Date of Patent: November 3, 2020Assignee: Marvell Asia Pte, Ltd.Inventors: Joseph F. Stormes, John A. Fifield, Darren L. Anand
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Publication number: 20200295653Abstract: A charge pump circuit includes a charge pump configured to increase a voltage of an input signal to generate a voltage-boosted input signal, output the voltage-boosted input signal in response to a determination that the voltage-boosted input signal is greater than or equal to a threshold, and connect the charge pump to a supply voltage to pre-charge the charge pump in response to a determination that the voltage-boosted input signal is less than the threshold. The charge pump circuit includes bandgap reference generator configured to receive the voltage-boosted input signal and output, based on the voltage-boosted input signal, a voltage reference signal to a device that operates in accordance with the supply voltage.Type: ApplicationFiled: June 1, 2020Publication date: September 17, 2020Inventors: Eric D. HUNT-SCHROEDER, John A. Fifield, Dale E. Pontius
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Patent number: 10707845Abstract: The present disclosure relates to a structure which includes a voltage level shifter circuit which includes a first current mirror leg circuit and a second current mirror leg circuit, the first current mirror leg circuit receives an input signal on a low voltage power supply and level shifts the input signal to a high voltage power supply which is at a greater voltage than the low voltage power supply, and the high voltage power supply is output from the second current mirror leg circuit.Type: GrantFiled: November 13, 2018Date of Patent: July 7, 2020Assignee: Marvell International Ltd.Inventors: Eric D. Hunt-Schroeder, John A. Fifield
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Patent number: 10699771Abstract: A voltage boost circuit for eDram using thin oxide field effect transistors (FETs) is disclosed. The voltage boost circuit includes a boost capacitor which is precharged with a precharge voltage in a precharge stage and which provides a boosted supply voltage to a thin oxide FET during a pump phase. The voltage boost circuit further include a drive capacitor which provides a turn on voltage to the thin oxide FET so that the boosted supply voltage can pass to an output node in the pump phase.Type: GrantFiled: July 10, 2019Date of Patent: June 30, 2020Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATIONInventors: John A. Fifield, Dale E. Pontius
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Patent number: 10673321Abstract: Methods produce IC devices that include a multiplexor that is electrically connected to a bandgap reference generator and a charge pump. The multiplexor receives voltage levels of a voltage-boosted clock signal being output by the charge pump to the bandgap reference generator. The multiplexor outputs, to the charge pump, either: a retry signal (if the voltage levels of the voltage-boosted clock signal being output by the charge pump are below a voltage threshold) or a pump signal (if the voltage levels of the voltage-boosted clock signal being output by the charge pump are not below the voltage threshold). The pump signal causes the charge pump to output the voltage-boosted clock signal to the bandgap reference generator. The retry signal causes the charge pump to not output the voltage-boosted clock signal to the bandgap reference generator, and instead to precharge the charge pump.Type: GrantFiled: November 27, 2017Date of Patent: June 2, 2020Assignee: Marvell Asia Pte., Ltd.Inventors: Eric Hunt-Schroeder, John A. Fifield, Dale E. Pontius
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Publication number: 20200153418Abstract: The present disclosure relates to a structure which includes a voltage level shifter circuit which includes a first current mirror leg circuit and a second current mirror leg circuit, the first current mirror leg circuit receives an input signal on a low voltage power supply and level shifts the input signal to a high voltage power supply which is at a greater voltage than the low voltage power supply, and the high voltage power supply is output from the second current mirror leg circuit.Type: ApplicationFiled: November 13, 2018Publication date: May 14, 2020Inventors: Eric D. HUNT-SCHROEDER, John A. FIFIELD
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Patent number: 10615797Abstract: A high speed VPP level translator circuit using thin-oxide field effect transistors (FETs) and methods of use are disclosed. The level translator includes a resistor divider and a one-shot circuit in parallel with the resistor divider. The one-shot circuit conducts to assist a transition from a first state to a second state, and is non-conducting during the transition from the second state to the first state.Type: GrantFiled: January 17, 2019Date of Patent: April 7, 2020Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATIONInventor: John A. Fifield
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Patent number: 10535379Abstract: A latching current sensing amplifier circuit for memory arrays and a current sensing technique using the latching current sensing amplifier circuit are provided. The current sense-amplifier circuit includes a first and second pair of series connected transistors configured with a common gate node for a sense operation and reconfigurable as a cross-coupled pair for a latching operation.Type: GrantFiled: September 5, 2017Date of Patent: January 14, 2020Assignee: GLOBALFOUNDRIES INC.Inventors: Darren L. Anand, John A. Fifield, Eric D. Hunt-Schroeder, Mark D. Jacunski
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Publication number: 20190333568Abstract: A voltage boost circuit for eDram using thin oxide field effect transistors (FETs) is disclosed. The voltage boost circuit includes a boost capacitor which is precharged with a precharge voltage in a precharge stage and which provides a boosted supply voltage to a thin oxide FET during a pump phase. The voltage boost circuit further include a drive capacitor which provides a turn on voltage to the thin oxide FET so that the boosted supply voltage can pass to an output node in the pump phase.Type: ApplicationFiled: July 10, 2019Publication date: October 31, 2019Inventors: John A. Fifield, Dale E. Pontius
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Patent number: 10446239Abstract: An array of memory cells in rows and columns with each column having a corresponding reference cell and a corresponding comparator. Each memory cell in a given row and given column is connected to a memory wordline for the row and to a memory bitline for the column. Each reference cell is connected to a reference wordline for the reference cells and to a reference bitline. Each comparator for a column has a current mirror with a reference section connected to the reference bitline for the reference cell for the column and a memory section connected to the memory bitline for the memory cells in the column. Each reference section has a current mirror node and all current mirror nodes in the array are connected to reduce mismatch and improve sensing accuracy. Voltages applied to the memory and reference wordlines are varied to provide accurate single-ended sensing, margin testing, etc.Type: GrantFiled: July 11, 2018Date of Patent: October 15, 2019Assignee: GLOBALFOUNDRIES INC.Inventors: John A. Fifield, Eric Hunt-Schroeder
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Patent number: 10438652Abstract: A voltage boost circuit for eDram using thin oxide field effect transistors (FETs) is disclosed. The voltage boost circuit includes a boost capacitor which is precharged with a precharge voltage in a precharge stage and which provides a boosted supply voltage to a thin oxide FET during a pump phase. The voltage boost circuit further include a drive capacitor which provides a turn on voltage to the thin oxide FET so that the boosted supply voltage can pass to an output node in the pump phase.Type: GrantFiled: August 8, 2018Date of Patent: October 8, 2019Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATIONInventors: John A. Fifield, Dale E. Pontius
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Patent number: 10429434Abstract: Disclosed are an on-chip reliability monitor and method. The monitor includes a test circuit with a test device, a reference circuit with a reference device, and a comparator circuit. The monitor periodically switches from operation in a stress mode, to operation in a test mode, and back. During each stress mode, the test device is subjected to stress conditions that emulate the operating conditions of an on-chip functional device while the reference device remains essentially unstressed. During each test mode, the comparator circuit compares a parameter of the test device to the same parameter of the reference device and outputs a status signal based on the difference between the parameters. When the status signal switches values, it is an indicator that the functional device has been subjected to a predetermined number of power-on-hours. Optionally, multiple monitors can be cascaded together to more accurately monitor stress-induced changes over time.Type: GrantFiled: February 23, 2018Date of Patent: October 1, 2019Assignee: GLOBALFOUNDRIES INC.Inventors: John A. Fifield, Eric Hunt-Schroeder, Mark D. Jacunski
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Publication number: 20190265293Abstract: Disclosed are an on-chip reliability monitor and method. The monitor includes a test circuit with a test device, a reference circuit with a reference device, and a comparator circuit. The monitor periodically switches from operation in a stress mode, to operation in a test mode, and back. During each stress mode, the test device is subjected to stress conditions that emulate the operating conditions of an on-chip functional device while the reference device remains essentially unstressed. During each test mode, the comparator circuit compares a parameter of the test device to the same parameter of the reference device and outputs a status signal based on the difference between the parameters. When the status signal switches values, it is an indicator that the functional device has been subjected to a predetermined number of power-on-hours. Optionally, multiple monitors can be cascaded together to more accurately monitor stress-induced changes over time.Type: ApplicationFiled: February 23, 2018Publication date: August 29, 2019Inventors: John A. Fifield, Eric Hunt-Schroeder, Mark D. Jacunski
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Patent number: 10395752Abstract: The present disclosure relates to a structure which includes a twin-cell memory which includes a first device and a second device and which is configured to store data which corresponds to a threshold voltage difference between the first device controlled by a first wordline and the second device controlled by a second wordline.Type: GrantFiled: October 11, 2017Date of Patent: August 27, 2019Assignee: GLOBALFOUNDRIES INC.Inventors: John A. Fifield, Eric D. Hunt-Schroeder, Darren L. Anand
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Patent number: 10381829Abstract: A power distribution system including a high-voltage direct current unit (HVDCU) configured to receive an amount of high-frequency alternating current (AC) input power from a power source and convert the input power into DC power, a negative voltage distribution rail and a positive voltage distribution rail that are together configured to supply the high-voltage DC power to at least one control unit (CU) electrically disposed between the negative voltage distribution rail and the positive voltage distribution rail and the CU being configured to convert the DC power into output power compatible with at least one load and supply the output power to the loads associated with it.Type: GrantFiled: March 29, 2017Date of Patent: August 13, 2019Assignee: Astronics Advanced Electronic Systems Corp.Inventors: Jeffrey A. Jouper, John Fifield
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Patent number: 10382049Abstract: Disclosed is a calibration circuit and method. The circuit includes: a DAC that outputs an analog parameter and includes output parameter adjustment circuitry; a comparator that receives a reference parameter and the analog parameter; and a control circuit (with select logic) connected to the comparator and DAC in a feedback loop. During a calibration mode, the magnitude of the analog parameter is adjusted by ½ DAC step in one direction and the feedback loop is used to perform a binary search calibration process. During an operation mode, the magnitude of the analog parameter is adjusted by ½ DAC step in the opposite direction. The select logic selects the DAC step identified by the calibration process or the next higher DAC step as a final DAC step. The control circuit outputs a final DAC code corresponding to the final DAC step and the DAC generates a calibrated parameter based thereon.Type: GrantFiled: September 6, 2018Date of Patent: August 13, 2019Assignee: GLOBALFOUNDARIES INC.Inventors: Eric Hunt-Schroeder, John A. Fifield
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Publication number: 20190165669Abstract: Methods produce IC devices that include a multiplexor that is electrically connected to a bandgap reference generator and a charge pump. The multiplexor receives voltage levels of a voltage-boosted clock signal being output by the charge pump to the bandgap reference generator. The multiplexor outputs, to the charge pump, either: a retry signal (if the voltage levels of the voltage-boosted clock signal being output by the charge pump are below a voltage threshold) or a pump signal (if the voltage levels of the voltage-boosted clock signal being output by the charge pump are not below the voltage threshold). The pump signal causes the charge pump to output the voltage-boosted clock signal to the bandgap reference generator. The retry signal causes the charge pump to not output the voltage-boosted clock signal to the bandgap reference generator, and instead to precharge the charge pump.Type: ApplicationFiled: November 27, 2017Publication date: May 30, 2019Applicant: GLOBALFOUNDRIES INC.Inventors: Eric Hunt-Schroeder, John A. Fifield, Dale E. Pontius
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Publication number: 20190149153Abstract: A high speed VPP level translator circuit using thin-oxide field effect transistors (FETs) and methods of use are disclosed. The level translator includes a resistor divider and a one-shot circuit in parallel with the resistor divider. The one-shot circuit conducts to assist a transition from a first state to a second state, and is non-conducting during the transition from the second state to the first state.Type: ApplicationFiled: January 17, 2019Publication date: May 16, 2019Inventor: John A. FIFIELD
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Publication number: 20190108894Abstract: The present disclosure relates to a structure which includes a twin-cell memory which includes a first device and a second device and which is configured to store data which corresponds to a threshold voltage difference between the first device controlled by a first wordline and the second device controlled by a second wordline.Type: ApplicationFiled: October 11, 2017Publication date: April 11, 2019Inventors: John A. FIFIELD, Eric D. HUNT-SCHROEDER, Darren L. ANAND