Patents by Inventor Stefan Wurster
Stefan Wurster 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: 10320399Abstract: A clocking system disclosed herein includes a delay locked loop (DLL) circuit with a plurality of delay elements, where the DLL circuit is configured to receive a clock input signal and generate a plurality of clock output signals. The clocking system also includes a feed-forward system configured to increase the speed of the clock signal transmission through the delay elements and to enforce symmetric zero crossings of the clock signal at each of the plurality of delay elements.Type: GrantFiled: June 8, 2018Date of Patent: June 11, 2019Assignee: Microsoft Technology Licensing, LLCInventors: Stefan Wurster, Richard McCauley, Barry Thompson
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Patent number: 10205931Abstract: A voltage mode laser diode driver selectively turns on and off a laser diode. An output stage has an output node configured to be connected to one of the terminals of the laser diode. Depending upon implementation, an active swing controller drives the output stage in a manner that substantially prevents inductive kickback from causing the output node voltage to swinging above the voltage level at the voltage output of the power supply, or swing below ground. The output stage provides a discharge path around the laser diode to shunt current associated with the inductive kickback, and substantially eliminates ringing on the output node of the output stage while the laser diode is off. A power supply controller adjusts the voltage level of the voltage output of the power supply so that current through the laser diode when on and emitting light is substantially equal to a predetermined desired current.Type: GrantFiled: March 13, 2017Date of Patent: February 12, 2019Assignee: MICROSOFT TECHNOLOGY LICENSING, LLCInventors: Barry Thompson, Stefan Wurster, Lawrence A. Prather, Dane Snow, Richard McCauley
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Publication number: 20180294816Abstract: A clocking system disclosed herein includes a delay locked loop (DLL) circuit with a plurality of delay elements, where the DLL circuit is configured to receive a clock input signal and generate a plurality of clock output signals. The clocking system also includes a feed-forward system configured to increase the speed of the clock signal transmission through the delay elements and to enforce symmetric zero crossings of the clock signal at each of the plurality of delay elements.Type: ApplicationFiled: June 8, 2018Publication date: October 11, 2018Inventors: Richard MCCAULEY, Barry THOMPSON, Stefan WURSTER
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Publication number: 20180198453Abstract: A clocking system disclosed herein includes a delay locked loop (DLL) circuit with a plurality of delay elements, where the DLL circuit is configured to receive a clock input signal and generate a plurality of clock output signals. The clocking system also includes a feed-forward system configured to increase the speed of the clock signal transmission through the delay elements and to enforce symmetric zero crossings of the clock signal at each of the plurality of delay elements.Type: ApplicationFiled: August 1, 2017Publication date: July 12, 2018Inventors: Richard MCCAULEY, Barry THOMPSON, Stefan WURSTER
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Patent number: 10020813Abstract: A clocking system disclosed herein includes a delay locked loop (DLL) circuit with a plurality of delay elements, where the DLL circuit is configured to receive a clock input signal and generate a plurality of clock output signals. The clocking system also includes a feed-forward system configured to increase the speed of the clock signal transmission through the delay elements and to enforce symmetric zero crossings of the clock signal at each of the plurality of delay elements.Type: GrantFiled: August 1, 2017Date of Patent: July 10, 2018Assignee: Microsoft Technology Licensing, LLCInventors: Richard McCauley, Barry Thompson, Stefan Wurster
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Patent number: 9769459Abstract: A voltage mode laser diode driver selectively turns on and off a laser diode. An output stage has an output node configured to be connected to one of the terminals of the laser diode. Depending upon implementation, an active swing controller drives the output stage in a manner that substantially prevents inductive kickback from causing the output node voltage to swinging above the voltage level at the voltage output of the power supply, or swing below ground. The output stage provides a discharge path around the laser diode to shunt current associated with the inductive kickback, and substantially eliminates ringing on the output node of the output stage while the laser diode is off. A power supply controller adjusts the voltage level of the voltage output of the power supply so that current through the laser diode when on and emitting light is substantially equal to a predetermined desired current.Type: GrantFiled: November 12, 2013Date of Patent: September 19, 2017Assignee: MICROSOFT TECHNOLOGY LICENSING, LLCInventors: Barry Thompson, Stefan Wurster, Lawrence A. Prather, Dane Snow, Richard McCauley
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Patent number: 9753138Abstract: A transducer such as a translinear proportional-to-absolute-temperature sensor uses two amplifiers, where each amplifier is used in a variety of modes. The first amplifier generates a measurement voltage though feedback in an analog circuit. The second amplifier samples and integrates the measurement in a switched-capacitor mode, and the output is stored on a capacitor. Then the first amplifier is set to measure its offset. The offset is sampled and integrated by the second amplifier, and the output is stored on a second capacitor. Then the first and second amplifiers are set to buffer the voltages stored on the capacitors. The measurement can then be offset-adjusted by digital or analog means. The adjusted measurement is then available to be used for calibration of, e.g., an image sensor. Other transducers, such as pressure sensors, strain sensors, gyroscopes, magnetometers, accelerometers, and xyz positioning sensors may employ the same dual amplifier approach.Type: GrantFiled: April 13, 2016Date of Patent: September 5, 2017Assignee: Microsoft Technology Licensing, LLCInventors: Dane Snow, Barry Thompson, Mustansir Mukadam, Stefan Wurster, Shaun McCarthy
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Publication number: 20170187164Abstract: A voltage mode laser diode driver selectively turns on and off a laser diode. An output stage has an output node configured to be connected to one of the terminals of the laser diode. Depending upon implementation, an active swing controller drives the output stage in a manner that substantially prevents inductive kickback from causing the output node voltage to swinging above the voltage level at the voltage output of the power supply, or swing below ground. The output stage provides a discharge path around the laser diode to shunt current associated with the inductive kickback, and substantially eliminates ringing on the output node of the output stage while the laser diode is off. A power supply controller adjusts the voltage level of the voltage output of the power supply so that current through the laser diode when on and emitting light is substantially equal to a predetermined desired current.Type: ApplicationFiled: March 13, 2017Publication date: June 29, 2017Applicant: Microsoft Technology Licensing, LLCInventors: Barry Thompson, Stefan Wurster, Lawrence A. Prather, Dane Snow, Richard McCauley
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Publication number: 20150130903Abstract: A voltage mode laser diode driver selectively turns on and off a laser diode. An output stage has an output node configured to be connected to one of the terminals of the laser diode. Depending upon implementation, an active swing controller drives the output stage in a manner that substantially prevents inductive kickback from causing the output node voltage to swinging above the voltage level at the voltage output of the power supply, or swing below ground. The output stage provides a discharge path around the laser diode to shunt current associated with the inductive kickback, and substantially eliminates ringing on the output node of the output stage while the laser diode is off. A power supply controller adjusts the voltage level of the voltage output of the power supply so that current through the laser diode when on and emitting light is substantially equal to a predetermined desired current.Type: ApplicationFiled: November 12, 2013Publication date: May 14, 2015Applicant: Microsoft CorporationInventors: Barry Thompson, Stefan Wurster, Lawrence A. Prather, Dane Snow, Richard McCauley
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Patent number: 8941694Abstract: A method of driving an electro-optic display comprising providing a current source, digitally modulating the current source and generating a modulated digital signal, and converting the modulated digital signal into an effective analog drive signal so that the display pixels receive an effective analog drive current, wherein the internal capacitance of the electro-optic display smooths the digitally modulated signal and generates the effective analog drive signal.Type: GrantFiled: September 26, 2008Date of Patent: January 27, 2015Assignee: Cambridge Display Technology LimitedInventors: Euan C. Smith, David S. Warren, Richard Alan Page, Stefan Wurster, Barry Thompson
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Patent number: 8847944Abstract: A current matching control apparatus for matching a plurality of current sources and a plurality of current sinks, the plurality of current sinks having a drive current value controlled by a drive processor in accordance with a reference control current and wherein each output of the plurality of current sinks are connected to a common output node; a feedback circuit having an input connected to the common output node and an output connected to the drive processor, wherein the feedback circuit is arranged to match a voltage at the common output node to a reference voltage by communicating a signal to the drive processor to adjust the reference control current.Type: GrantFiled: September 26, 2008Date of Patent: September 30, 2014Assignee: Cambridge Display Technology LimitedInventors: Euan C. Smith, Richard Alan Page, Stefan Wurster, Barry Thompson
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Publication number: 20100259528Abstract: A display driver control circuitry and method for controlling a display driver for an electroluminescent display, the display comprising at least one substantially constant current generator for driving the display element, the control circuitry comprising: a drive voltage sensor for sensing a drive voltage on a first line in which the current is regulated by the constant current generator; a reference voltage generator for providing a reference voltage offset from a supply voltage provided from a supply line to the constant current generator; means for determining a difference between the reference voltage and the drive voltage and for generating an adjustment signal, and wherein a voltage controller is configured to adjust the supply voltage responsive to the adjustment signal.Type: ApplicationFiled: September 26, 2008Publication date: October 14, 2010Applicant: CAMBRIDGE DISPLAY TECHNOLOGY LIMITEDInventors: Euan C. Smith, Richard Alan Page, Stefan Wurster, Barry Thompson
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Publication number: 20100259518Abstract: A current matching control apparatus for matching a plurality of current sources and a plurality of current sinks, the plurality of current sinks having a drive current value controlled by a drive processor in accordance with a reference control current and wherein each output of the plurality of current sinks are connected to a common output node; a feedback circuit having an input connected to the common output node and an output connected to the drive processor, wherein the feedback circuit is arranged to match a voltage at the common output node to a reference voltage by communicating a signal to the drive processor to adjust the reference control current.Type: ApplicationFiled: September 26, 2008Publication date: October 14, 2010Applicant: CAMBRIDGE DISPLAY TECHNOLOGY LTD.Inventors: Euan C. Smith, Richard Alan Page, Stefan Wurster, Barry Thompson
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Publication number: 20100245401Abstract: A method of driving an electro-optic display comprising providing a current source, digitally modulating the current source and generating a modulated digital signal, and converting the modulated digital signal into an effective analog drive signal so that the display pixels receive an effective analog drive current, wherein the internal capacitance of the electro-optic display smooths the digitally modulated signal and generates the effective analog drive signal.Type: ApplicationFiled: September 26, 2008Publication date: September 30, 2010Applicant: CAMBRIDGE DISPLAY TECHNOLOGY LIMITEDInventors: Euan C. Smith, David S. Warren, Richard Alan Page, Stefan Wurster, Barry Thompson
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Patent number: 5666129Abstract: A pair of electrical display elements, LEDs, is driven by a three-state buffer driver circuit. The LEDs have associated current-limiting resistors. The driver circuit applies different selected voltage levels at different selected predetermined frequencies to the LEDs. By having two predetermined frequencies to a pair of LEDs, there can be exhibited at least five different display conditions from the pair of LEDs.Type: GrantFiled: July 6, 1994Date of Patent: September 9, 1997Assignee: Level One Communications, Inc.Inventors: Stefan Wurster, Haim Shafir, Ralph Andersson