Patents by Inventor Michael Hopgood
Michael Hopgood 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: 9886402Abstract: A method comprises selecting a starting point on a map of equalization coefficients and measuring an eye height of a signal transmitted using the set of equalization coefficients associated with the starting point and an eye height associated with each adjacent point on the map relative to the starting point. The eye height associated with an adjacent point is based on a signal transmitted using the set of equalization coefficients associated with the adjacent point. The method also comprises walking on the map in a first direction from the starting point to the adjacent point associated with the greatest eye height, wherein the eye height associated with the adjacent point is greater than or equal to the eye height associated with the starting point.Type: GrantFiled: December 20, 2012Date of Patent: February 6, 2018Assignee: NVIDIA CORPORATIONInventors: Michael Hopgood, Robert Huang, Vishal Mehta, Hitendra Dutt
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Patent number: 9847891Abstract: In a system according to one embodiment of the present disclosure, the system comprises a first device, a second device, a communications link, and a memory. The memory stores instructions that when executed by the system perform a method of communications link training. This method comprises requesting a speed change to a second speed for the first device communicating with the second device at a first speed via the communications link. A saved set of parameters are accessed for at least one of the first device and the second device. A first training cycle is performed for the first device and the second device at the second speed using the saved set of parameters for the at least one of the first device and second device. The reuse of parameters from a previous successful equalization training cycle reduces the time required to perform equalization training.Type: GrantFiled: August 24, 2011Date of Patent: December 19, 2017Assignee: Nvidia CorporationInventors: David Wyatt, Vishal Mehta, Michael Hopgood, Mark Taylor, Hitendra Dutt, Samuel Vincent, Wei-Je Huang
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Patent number: 9413518Abstract: Systems and methods for stabilizing clock data recovery (CDR) by filtering the abrupt phase shift associated with data pattern transition in the input signal. The CDR circuit includes a data pattern detector coupled to a data pattern filter. The data pattern detector is capable of detecting the data patterns of the input signal. Accordingly, the data pattern filter can selectively generate a filter indication indicating to freeze or suppress the CDR phase caused by data pattern transition. The filter indication can be incorporated to a phase error signal, a gain function, and/or the control voltage driving the VCO.Type: GrantFiled: August 12, 2013Date of Patent: August 9, 2016Assignee: NVIDIA CORPORATIONInventors: Yu Chang, Huabo Chen, Hakki Ozguc, Michael Hopgood
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Publication number: 20150043698Abstract: Systems and methods for stabilizing clock data recovery (CDR) by filtering the abrupt phase shift associated with data pattern transition in the input signal. The CDR circuit includes a data pattern detector coupled to a data pattern filter. The data pattern detector is capable of detecting the data patterns of the input signal. Accordingly, the data pattern filter can selectively generate a filter indication indicating to freeze or suppress the CDR phase caused by data pattern transition. The filter indication can be incorporated to a phase error signal, a gain function, and/or the control voltage driving the VCO.Type: ApplicationFiled: August 12, 2013Publication date: February 12, 2015Applicant: NVIDIA CORPORATIONInventors: Yu CHANG, Huabo CHEN, Hakki OZGUC, Michael HOPGOOD
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Patent number: 8949497Abstract: In an apparatus according to one embodiment of the present disclosure, a communications link comprises a first device and a second device communicating with each other via the communications link at a plurality of different speeds. However, prior to communicating via the communications link for the first time at a second speed, the first device and second device complete a first training cycle at the second speed. Further, during this first training cycle for the second speed, the first training cycle for the second speed will pause before the first training cycle at the second speed completes, and the first device and second device communicate at a first speed for a period of time before returning to the paused first training cycle at the second speed. When the paused first training cycle for the second speed continues, the first training cycle for the second speed will continue where it had paused.Type: GrantFiled: September 12, 2011Date of Patent: February 3, 2015Assignee: NVIDIA CorporationInventors: Michael Hopgood, Wei-Je Huang, Mark Taylor, Hitendra Dutt, David Wyatt, Vishal Mehta
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Patent number: 8897352Abstract: A method comprises performing a first pass test over a plurality of sets of equalization coefficients to filter the plurality of sets of equalization coefficients to produce one or more filtered sets of equalization coefficients. Each filtered set of equalization coefficients meets a first predetermined threshold. The method also comprises performing a second pass test over the one or more filtered sets of equalization coefficients to determine a final set of equalization coefficients that meets a second predetermined threshold. The second pass test produces more accurate results than the first pass test.Type: GrantFiled: December 20, 2012Date of Patent: November 25, 2014Assignee: NVIDIA CorporationInventors: Hungse Cha, Robert Huang, Vishal Mehta, Feroze Karim, Dennis Kd Ma, Michael Hopgood, Srikanth Devarapalli
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Publication number: 20140177695Abstract: A method comprises performing a first pass test over a plurality of sets of equalization coefficients to filter the plurality of sets of equalization coefficients to produce one or more filtered sets of equalization coefficients. Each filtered set of equalization coefficients meets a first predetermined threshold. The method also comprises performing a second pass test over the one or more filtered sets of equalization coefficients to determine a final set of equalization coefficients that meets a second predetermined threshold. The second pass test produces more accurate results than the first pass test.Type: ApplicationFiled: December 20, 2012Publication date: June 26, 2014Applicant: NVIDIA CORPORATIONInventors: Hungse Cha, Robert Huang, Vishal Mehta, Feroze Karim, Dennis Kd Ma, Michael Hopgood, Srikanth Devarapalli
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Publication number: 20140181339Abstract: A method comprises selecting a starting point on a map of equalization coefficients and measuring an eye height of a signal transmitted using the set of equalization coefficients associated with the starting point and an eye height associated with each adjacent point on the map relative to the starting point. The eye height associated with an adjacent point is based on a signal transmitted using the set of equalization coefficients associated with the adjacent point. The method also comprises walking on the map in a first direction from the starting point to the adjacent point associated with the greatest eye height, wherein the eye height associated with the adjacent point is greater than or equal to the eye height associated with the starting point.Type: ApplicationFiled: December 20, 2012Publication date: June 26, 2014Applicant: NVIDIA CORPORATIONInventors: Michael Hopgood, Robert Huang, Vishal Mehta, Hitendra Dutt
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Publication number: 20130067127Abstract: In an apparatus according to one embodiment of the present disclosure, a communications link comprises a first device and a second device communicating with each other via the communications link at a plurality of different speeds. However, prior to communicating via the communications link for the first time at a second speed, the first device and second device complete a first training cycle at the second speed. Further, during this first training cycle for the second speed, the first training cycle for the second speed will pause before the first training cycle at the second speed completes, and the first device and second device communicate at a first speed for a period of time before returning to the paused first training cycle at the second speed. When the paused first training cycle for the second speed continues, the first training cycle for the second speed will continue where it had paused.Type: ApplicationFiled: September 12, 2011Publication date: March 14, 2013Applicant: NVIDIA CORPORATIONInventors: Michael Hopgood, Wei-Je Huang, Mark Taylor, Hitendra Dutt, David Wyatt, Vishal Mehta
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Publication number: 20130051483Abstract: In a system according to one embodiment of the present disclosure, the system comprises a first device, a second device, a communications link, and a memory. The memory stores instructions that when executed by the system perform a method of communications link training. This method comprises requesting a speed change to a second speed for the first device communicating with the second device at a first speed via the communications link. A saved set of parameters are accessed for at least one of the first device and the second device. A first training cycle is performed for the first device and the second device at the second speed using the saved set of parameters for the at least one of the first device and second device. The reuse of parameters from a previous successful equalization training cycle reduces the time required to perform equalization training.Type: ApplicationFiled: August 24, 2011Publication date: February 28, 2013Applicant: NVIDIA CorporationInventors: David Wyatt, Vishal Mehta, Michael Hopgood, Mark Taylor, Hitendra Dutt, Samuel Vincent, Wei-Je Huang