Patents by Inventor Olafur Josefsson
Olafur Josefsson 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: 9689739Abstract: Microelectromechanical (MEMS) sensors and control interfaces, control, interface components, protocols, systems, and methods are described. An exemplary control interface can comprise one or more predefined symbols that facilitate control of a MEMS sensor over an existing pin of a package comprising one or more MEMS sensors. Provided implementations described read/write protocols that enable reading and/or writing internal registers associated with MEMS sensors and/or other electronic components or portions thereof. Embodiments of the subject disclosure can provide flexible and reusable control interfaces for MEMS sensors and associated protocols.Type: GrantFiled: June 13, 2014Date of Patent: June 27, 2017Assignee: INVENSENSE, INC.Inventors: Yang Pan, Olafur Josefsson
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Publication number: 20150362362Abstract: Microelectromechanical (MEMS) sensors and control interfaces, control, interface components, protocols, systems, and methods are described. An exemplary control interface can comprise one or more predefined symbols that facilitate control of a MEMS sensor over an existing pin of a package comprising one or more MEMS sensors. Provided implementations described read/write protocols that enable reading and/or writing internal registers associated with MEMS sensors and/or other electronic components or portions thereof. Embodiments of the subject disclosure can provide flexible and reusable control interfaces for MEMS sensors and associated protocols.Type: ApplicationFiled: June 13, 2014Publication date: December 17, 2015Inventors: Yang Pan, Olafur Josefsson
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Patent number: 7683815Abstract: A cross-coupled switched capacitor circuit that has two branches. During a first phase for the first branch, an input voltage is provided that causes charge to move through a resistor and to be placed onto a plate of the capacitor within the branch. An equivalent amount of charge is transferred to an output node. The output node may be a summing node of a sigma-delta modulator. The summing node is one of the inputs to an operational amplifier that is part of the integrator of the sigma-delta modulator. The resistor and the capacitor in the first branch define an RC circuit and corresponding RC time constant. During the first phase, the capacitor does not reach a fully settled voltage for a desired resolution. During the second phase, the capacitor in the first branch of the circuit is set to a defined voltage. The defined voltage may be the settling voltage had the capacitor been allowed to settle during the first phase.Type: GrantFiled: June 5, 2008Date of Patent: March 23, 2010Assignee: Analog Devices, Inc.Inventors: Olafur Josefsson, Khiem Nguyen
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Publication number: 20080303703Abstract: A cross-coupled switched capacitor circuit that has two branches. During a first phase for the first branch, an input voltage is provided that causes charge to move through a resistor and to be placed onto a plate of the capacitor within the branch. An equivalent amount of charge is transferred to an output node. The output node may be a summing node of a sigma-delta modulator. The summing node is one of the inputs to an operational amplifier that is part of the integrator of the sigma-delta modulator. The resistor and the capacitor in the first branch define an RC circuit and corresponding RC time constant. During the first phase, the capacitor does not reach a fully settled voltage for a desired resolution. During the second phase, the capacitor in the first branch of the circuit is set to a defined voltage. The defined voltage may be the settling voltage had the capacitor been allowed to settle during the first phase.Type: ApplicationFiled: June 5, 2008Publication date: December 11, 2008Applicant: ANALOG DEVICES, INC.Inventors: Olafur Josefsson, Khiem Nguyen
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Publication number: 20080090625Abstract: A microphone microchip for a voice communication device. The microchip receives and processes an audio signal from a microphone. The microchip incorporates an RF filter that substantially attenuates noise signals at RF frequencies, while passing audio signals, substantially unattenuated. The filter is inserted between ports through which RF carrier signal noise can enter the microchip and internal elements of the microchip that provide a nonlinear response. Thus, modulated RF carrier noise is attenuated before this noise can interact with the nonlinear elements to convert the modulated carrier noise to audible interference. Corruption of microphone signals is thereby avoided.Type: ApplicationFiled: October 11, 2007Publication date: April 17, 2008Applicant: ANALOG DEVICES, INC.Inventors: Olafur Josefsson, Anthony Volpe
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Publication number: 20080089536Abstract: A system for processing a sound input to a MEMS microphone in a voice communication device, such as a cellular telephone. The system includes the microphone and a processing microchip. The processing microchip includes a differential receiver that receives the signal output of the microphone on one input and a voltage that biases the microphone on the other input. The output of the differential receiver represents the audio signal from the microphone, while noise signals induced on connections between the microphone and microchip are received equally on the differential receiver inputs, thereby cancelling. Further, the processing microchip also includes a bias voltage generator circuit for supplying a bias voltage to the microphone. Noise that is coupled onto or is inherent in the bias voltage generator circuit or couples onto the signal path from the bias voltage generator to the microphone will traverse substantially symmetrical paths to the differential receiver.Type: ApplicationFiled: October 11, 2007Publication date: April 17, 2008Applicant: ANALOG DEVICES, INC.Inventor: Olafur Josefsson
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Patent number: 7305037Abstract: A calibration system for a communication system is provided featuring a transmitter circuit, a receiver circuit, a transmission medium having a transfer function for transmitting a signal between the transmitter and receiver circuits, and a calibration system responsive to the altered reference signal of the transmitter circuit for adjusting the reference signal level of one of the transmitter and receiver circuits to compensate for variations in the transmission signal due to the transfer function.Type: GrantFiled: February 16, 2001Date of Patent: December 4, 2007Assignee: Analog Devices, Inc.Inventors: Olafur Josefsson, Colm Prendergast, James Wilson, Daniel T. Boyko
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Publication number: 20070030038Abstract: A charge/discharge control circuit for controlling current through an input/output audio device includes a first voltage reference; a second voltage reference and a waveform generation circuit responsive to the first and second voltage references for generating a multi-stage waveform profile which is approximately an inaudible waveform for suppressing audible artifacts in the input/output device.Type: ApplicationFiled: June 27, 2006Publication date: February 8, 2007Inventors: Colin McHugh, Olafur Josefsson
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Publication number: 20070001757Abstract: A switched capacitor system with output glitch reduction step charges the switched capacitor by switching it to a first voltage level in a first phase, to an intermediate voltage level of a pre-charge node in a pre-charge phase and to the voltage level of the output node of the amplifier stage in a settling phase; the pre-charge node can be implemented at the input of the amplifier stage, the output of a preceding stage or at any other pre-existing suitable node in the amplifier system.Type: ApplicationFiled: June 30, 2005Publication date: January 4, 2007Inventor: Olafur Josefsson
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Patent number: 7110531Abstract: An isolation system with analog communication across an isolation barrier includes an isolation barrier circuit having at least one isolation element; a digital to analog circuit having an analog output connected to the isolation barrier and an input for receiving an input digital signal to be communicated across the isolation barrier; and an analog to digital circuit having an input coupled to the analog output of the isolation barrier circuit for providing a digital output signal.Type: GrantFiled: February 15, 2001Date of Patent: September 19, 2006Assignee: Analog Devices, Inc.Inventors: Colm J. Prendergast, Olafur Josefsson, James Wilson, Daniel T. Boyko
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Publication number: 20060114049Abstract: A system and method for mutually charging switched capacitors in a switched capacitor system includes operating first and second sets of output switches during separate phases; operating first and second sets of input switches during separate phases but after the output switches are operated; and connecting the switched capacitors together after the output switches are operated but before the input switches are operated to enable them to share charge with each other toward a common mode voltage after the output switches are operated but before the input switches are operated.Type: ApplicationFiled: December 1, 2004Publication date: June 1, 2006Inventor: Olafur Josefsson
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Publication number: 20010031012Abstract: A calibration system for a communication system is provided featuring a transmitter circuit, a receiver circuit, a transmission medium having a transfer function for transmitting a signal between the transmitter and receiver circuits, and a calibration system responsive to the altered reference signal of the transmitter circuit for adjusting the reference signal level of one of the transmitter and receiver circuits to compensate for variations in the transmission signal due to the transfer function.Type: ApplicationFiled: February 16, 2001Publication date: October 18, 2001Inventors: Olafur Josefsson, Colm Prendergast, James Wilson, Daniel T. Boyko
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Publication number: 20010028320Abstract: An isolation system with analog communication across an isolation barrier includes an isolation barrier circuit having at least one isolation element; a digital to analog circuit having an analog output connected to the isolation barrier and an input for receiving an input digital signal to be communicated across the isolation barrier; and an analog to digital circuit having an input coupled to the analog output of the isolation barrier circuit for providing a digital output signal.Type: ApplicationFiled: February 15, 2001Publication date: October 11, 2001Inventors: Colm J. Prendergast, Olafur Josefsson, James Wilson, Daniel T. Boyko