Patents by Inventor Andrew Bothwell
Andrew Bothwell 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: 10182285Abstract: Circuitry detects properties of an accessory removably connected thereto via a multi-pole connector. The circuitry has first, second and third circuit terminals for coupling to respective first, second, and third poles of said connector, and has an output for providing evaluation values from which properties of the accessory may be derived. In the circuitry, first current sourcing circuitry is coupled to said first circuit terminal for providing a first current. A switch network comprises first, second, third and fourth switch network terminals, said first switch network terminal coupled to a reference potential, said second switch network terminal coupled to said second circuit terminal, and said third switch network terminal coupled to said third circuit terminal. Comparator circuitry provides a comparison signal, its first input terminal being coupled to said first circuit terminal.Type: GrantFiled: February 20, 2018Date of Patent: January 15, 2019Assignee: Cirrus Logic, Inc.Inventors: Graeme MacKay, Andrew Bothwell
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Patent number: 10149042Abstract: Circuitry detects properties of an accessory removably connected thereto via a multi-pole connector. The circuitry has first, second and third circuit terminals for coupling to respective first, second, and third poles of said connector, and has an output for providing evaluation values from which properties of the accessory may be derived. In the circuitry, first current sourcing circuitry is coupled to said first circuit terminal for providing a first current. A switch network comprises first, second, third and fourth switch network terminals, said first switch network terminal coupled to a reference potential, said second switch network terminal coupled to said second circuit terminal, and said third switch network terminal coupled to said third circuit terminal. Comparator circuitry provides a comparison signal, its first input terminal being coupled to said first circuit terminal.Type: GrantFiled: February 20, 2018Date of Patent: December 4, 2018Assignee: Cirrus Logic, Inc.Inventors: Graeme MacKay, Andrew Bothwell
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Publication number: 20180192183Abstract: Circuitry detects properties of an accessory removably connected thereto via a multi-pole connector. The circuitry has first, second and third circuit terminals for coupling to respective first, second, and third poles of said connector, and has an output for providing evaluation values from which properties of the accessory may be derived. In the circuitry, first current sourcing circuitry is coupled to said first circuit terminal for providing a first current. A switch network comprises first, second, third and fourth switch network terminals, said first switch network terminal coupled to a reference potential, said second switch network terminal coupled to said second circuit terminal, and said third switch network terminal coupled to said third circuit terminal. Comparator circuitry provides a comparison signal, its first input terminal being coupled to said first circuit terminal.Type: ApplicationFiled: February 20, 2018Publication date: July 5, 2018Applicant: Cirrus Logic International Semiconductor Ltd.Inventors: Graeme MACKAY, Andrew BOTHWELL
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Publication number: 20180176675Abstract: Circuitry detects properties of an accessory removably connected thereto via a multi-pole connector. The circuitry has first, second and third circuit terminals for coupling to respective first, second, and third poles of said connector, and has an output for providing evaluation values from which properties of the accessory may be derived. In the circuitry, first current sourcing circuitry is coupled to said first circuit terminal for providing a first current. A switch network comprises first, second, third and fourth switch network terminals, said first switch network terminal coupled to a reference potential, said second switch network terminal coupled to said second circuit terminal, and said third switch network terminal coupled to said third circuit terminal. Comparator circuitry provides a comparison signal, its first input terminal being coupled to said first circuit terminal.Type: ApplicationFiled: February 20, 2018Publication date: June 21, 2018Applicant: Cirrus Logic International Semiconductor Ltd.Inventors: Graeme MACKAY, Andrew BOTHWELL
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Patent number: 9986327Abstract: Circuitry detects properties of an accessory removably connected thereto via a multi-pole connector. The circuitry has first, second and third circuit terminals for coupling to respective first, second, and third poles of said connector, and has an output for providing evaluation values from which properties of the accessory may be derived. In the circuitry, first current sourcing circuitry is coupled to said first circuit terminal for providing a first current. A switch network comprises first, second, third and fourth switch network terminals, said first switch network terminal coupled to a reference potential, said second switch network terminal coupled to said second circuit terminal, and said third switch network terminal coupled to said third circuit terminal. Comparator circuitry provides a comparison signal, its first input terminal being coupled to said first circuit terminal.Type: GrantFiled: February 23, 2017Date of Patent: May 29, 2018Assignee: Cirrus Logic, Inc.Inventors: Graeme Mackay, Andrew Bothwell
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Publication number: 20170164094Abstract: Circuitry detects properties of an accessory removably connected thereto via a multi-pole connector. The circuitry has first, second and third circuit terminals for coupling to respective first, second, and third poles of said connector, and has an output for providing evaluation values from which properties of the accessory may be derived. In the circuitry, first current sourcing circuitry is coupled to said first circuit terminal for providing a first current. A switch network comprises first, second, third and fourth switch network terminals, said first switch network terminal coupled to a reference potential, said second switch network terminal coupled to said second circuit terminal, and said third switch network terminal coupled to said third circuit terminal. Comparator circuitry provides a comparison signal, its first input terminal being coupled to said first circuit terminal.Type: ApplicationFiled: February 23, 2017Publication date: June 8, 2017Applicant: Cirrus Logic International Semiconductor Ltd.Inventors: Graeme MACKAY, Andrew BOTHWELL
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Patent number: 9609425Abstract: Circuitry detects properties of an accessory removably connected thereto via a multi-pole connector. The circuitry has first, second and third circuit terminals for coupling to respective first, second, and third poles of said connector, and has an output for providing evaluation values from which properties of the accessory may be derived. In the circuitry, first current sourcing circuitry is coupled to said first circuit terminal for providing a first current. A switch network comprises first, second, third and fourth switch network terminals, said first switch network terminal coupled to a reference potential, said second switch network terminal coupled to said second circuit terminal, and said third switch network terminal coupled to said third circuit terminal. Comparator circuitry provides a comparison signal, its first input terminal being coupled to said first circuit terminal.Type: GrantFiled: December 13, 2013Date of Patent: March 28, 2017Assignee: Cirrus Logic, Inc.Inventors: Graeme Mackay, Andrew Bothwell
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Publication number: 20150358719Abstract: Circuitry detects properties of an accessory removably connected thereto via a multi-pole connector. The circuitry has first, second and third circuit terminals for coupling to respective first, second, and third poles of said connector, and has an output for providing evaluation values from which properties of the accessory may be derived. In the circuitry, first current sourcing circuitry is coupled to said first circuit terminal for providing a first current. A switch network comprises first, second, third and fourth switch network terminals, said first switch network terminal coupled to a reference potential, said second switch network terminal coupled to said second circuit terminal, and said third switch network terminal coupled to said third circuit terminal. Comparator circuitry provides a comparison signal, its first input terminal being coupled to said first circuit terminal.Type: ApplicationFiled: December 13, 2013Publication date: December 10, 2015Inventors: Graeme Mackay, Andrew Bothwell
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Patent number: 7680421Abstract: A multimode optical fibre communications system, and in particular to a system in which non-linearities in the propagation of the signal through a multimode optical communications channel degrade the signal presented to the receiver. The system includes an optical transmitter unit for connection to a multimode optical fibre transmission link. The transmitter unit has a data input for receiving an input data signal, a data signal processing circuit and a source of optical radiation. The data signal processing circuit is arranged to receive the input data signal from the data input and to provide a processed data signal to the source of optical radiation and the source of optical radiation is arranged to generate from this an optical signal for transmission by a multimode optical fibre.Type: GrantFiled: June 23, 2006Date of Patent: March 16, 2010Assignee: Avago Technologies General IP (Singapore) Pte. Ltd.Inventors: Andrew Bothwell, Simon Meadowcroft
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Patent number: 7657177Abstract: Distortion of an optical signal transmitted over a fibre optic link is characterized by a receiver including a photodetector for converting optical radiation into an electrical signal. A delay line delays the electrical signal. At least two delay line taps drive a register that stores plural values corresponding with different delayed replicas of the electrical signal. Signals commensurate with the values are externally provided to a signal distortion analyser for analysis of the values to determine the optical signal distortion.Type: GrantFiled: February 2, 2006Date of Patent: February 2, 2010Assignee: Avago Technologies General IP (Singapore) Pte. Ltd.Inventors: David Healy, Richard Cronin, Andrew Bothwell
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Patent number: 7567760Abstract: A method and apparatus for providing diagnostic features for an optical transceiver, in which the optical transceiver uses electronic dispersion compensation (EDC) in order to alleviate distortion of a signal caused by dispersion. A method and apparatus for monitoring the performance of an electronic dispersion compensator by monitoring one or more signals from the electronic dispersion compensator and generating an alarm in the vent that the performance of the electronic dispersion compensator falls below a certain threshold.Type: GrantFiled: June 29, 2006Date of Patent: July 28, 2009Assignee: Avago Technologies General IP (Singapore) Pte. Ltd.Inventors: Andrew Bothwell, Richard Cronin, David Healy
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Publication number: 20070009260Abstract: This invention relates to a method and apparatus for providing diagnostic features for an optical transceiver, in which the optical transceiver uses electronic dispersion compensation (EDC) in order to alleviate distortion of a signal caused by dispersion. The invention provides a method and apparatus for monitoring the performance of an electronic dispersion compensator by monitoring one or more signals from the electronic dispersion compensator and generating an alarm in the event that the performance of the electronic dispersion compensator falls below a certain threshold.Type: ApplicationFiled: June 29, 2006Publication date: January 11, 2007Inventors: Andrew Bothwell, Richard Cronin, David Healy
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Publication number: 20070009266Abstract: A multimode optical fibre communications system, and in particular to a system in which non-linearities in the propagation of the signal through a multimode optical communications channel degrade the signal presented to the receiver. The system includes an optical transmitter unit for connection to a multimode optical fibre transmission link. The transmitter unit has a data input for receiving an input data signal, a data signal processing circuit and a source of optical radiation. The data signal processing circuit is arranged to receive the input data signal from the data input and to provide a processed data signal to the source of optical radiation and the source of optical radiation is arranged to generate from this an optical signal for transmission by a multimode optical fibre.Type: ApplicationFiled: June 23, 2006Publication date: January 11, 2007Inventors: Andrew Bothwell, Simon Meadowcroft
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Publication number: 20060250141Abstract: Distortion of an optical signal transmitted over a fibre optic link is characterized by a receiver including a photodetector for converting optical radiation into an electrical signal. A delay line delays the electrical signal. At least two delay line taps drive a register that stores plural values corresponding with different delayed replicas of the electrical signal. Signals commensurate with the values are externally provided to a signal distortion analyser for analysis of the values to determine the optical signal distortion.Type: ApplicationFiled: February 2, 2006Publication date: November 9, 2006Inventors: David Healy, Richard Cronin, Andrew Bothwell
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Patent number: 6920050Abstract: A dummy module is inserted into an open slot in a modular rack to provide a cover for that slot. The dummy module is formed of the same housing as an operational module and contains a similar PCB as an operational module, without all the electrical and electronic components mounted thereon that an operational module would have. The PCB may have no components and no electrical tracks thereon, or it may be provided with some limited functionality. The PCB may have a memory device, such as an Electrically Erasable Programmable Read only Memory (EEPROM) mounted thereon, with at least an electrical track leading thereto from the connector block to enable a rack controller to interrogate the EEPROM. Thus, the rack controller would receive a positive identification from the EEPROM that the particular slot is empty, rather than simply trying to interrogate the slot and receiving no answer whatsoever.Type: GrantFiled: May 30, 2003Date of Patent: July 19, 2005Assignee: Agilent Technologies, Inc.Inventors: Kevin Little, Andrew Bothwell
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Publication number: 20040066639Abstract: A dummy module (11) is inserted into an open slot (2) in a modular rack (1) to provide a cover for that slot (2). The dummy module (11) is formed of the same housing (12) as an operational module and contains a similar PCB (8) as an operational module, except that the PCB will not have all the electrical and electronic components mounted thereon that an operational module would have. The PCB (8) may be completely bare of all components and have no electrical tracks thereon, or it may be provided with some limited functionality. For example, the PCB (8) may have a memory device, such as an Electrically Erasable Programmable Read only Memory (EEPROM) (14), mounted thereon, with at least an electrical track leading thereto from the connector block (6) to enable a rack controller to interrogate the EEPROM (14).Type: ApplicationFiled: May 30, 2003Publication date: April 8, 2004Inventors: Kevin Little, Andrew Bothwell
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Publication number: 20030063872Abstract: The present invention provides an optoelectronic module comprising an optical subassembly and an electrical subassembly each having a plurality of electrical connection points and ground plane connection points. The optical and electrical subassemblies are connected by a flexible circuit comprising transmission lines disposed on a substrate having a groundplane. The connection is such that electrical connection of the groundplanes is established. The optical and electrical subassemblies are preferably multi-layered structures.Type: ApplicationFiled: September 27, 2002Publication date: April 3, 2003Applicant: Agilent Technologies, Inc.Inventors: Andrew Philip Govan Date, Andrew Bothwell, Giampaolo Bendelli