Patents Assigned to Analog Devices
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Publication number: 20210104866Abstract: Laser driver designs that aim to reduce or eliminate the problem of fault laser firing are disclosed. Various laser driver designs presented herein are based on providing a current dissipation path that is configured to start providing a resistance for dissipating at least a portion, but preferably substantially all, of the negative current from the laser diode. Dissipating at least a portion of the negative current may decrease the unintentional increase of the voltage at the input to the laser diode and, therefore, reduce the likelihood that fault laser firing will occur. A control logic may be used to control the timing of when the current dissipation path is activated (i.e., provides the resistance to dissipate the negative current from the laser diode) and when it is deactivated.Type: ApplicationFiled: October 2, 2019Publication date: April 8, 2021Applicant: Analog Devices International Unlimited CompanyInventors: Celal AVCI, Yalcin Alper EKEN, Ercan KAYMAKSUT, Shawn S. KUO, Atilim ERGUL, Mehmet Arda AKKAYA
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Patent number: 10972117Abstract: Differential clamp circuits configured to recirculate the current in one clamp, either low-side clamp or high-side clamp, from one output of a differential signal to the other output of the differential signal are disclosed. Differential clamp circuits described herein may be particularly suitable for providing programmable clamps at differential outputs of an ADC driver and may be particularly beneficial to implement clamps that are symmetrical around an ADC's input common-mode voltage. Some differential clamp circuit described herein may advantageously present a smaller capacitive load at each output, thus reducing bandwidth degradation of the output stage. Furthermore, differential clamp circuits described herein may operate with only one control voltage, making it easier to limit the output excursions symmetrically around the default common-mode voltage.Type: GrantFiled: April 3, 2020Date of Patent: April 6, 2021Assignee: Analog Devices International Unlimited CompanyInventors: Joseph Adut, Jeremy Wong, Eugene Cheung, Brian Hamilton, Gregory Fung
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Patent number: 10972744Abstract: There is disclosed in one example a video processor, including: an input buffer to receive an input image; a slicer circuit to divide the input image into a plurality of N vertical slices; N parallel input buffers for de-rasterization; N parallel image scalers, wherein each scaler is hardware configured to scale in a raster form, one of the N vertical slices according to an image scaling algorithm; N parallel output buffers for rerasteriztion; and an output multiplexer to combine the scaled vertical slices into a combined scaled output image.Type: GrantFiled: November 12, 2018Date of Patent: April 6, 2021Assignee: ANALOG DEVICES INTERNATIONAL UNLIMITED COMPANYInventors: Anand Venkitasubramani, Bhavana Muralikrishna, Shreeja Sugathan, Niall D. O'Connell
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Patent number: 10972063Abstract: Amplifier systems for measuring a wide range of current are provided herein. In certain embodiments, an amplifier system includes a controllable sensing circuit, a first amplifier including an output configured to drive a device under test (DUT) through the controllable sensing circuit, and a second amplifier including an input coupled to the controllable sensing circuit and operable to generate a measurement signal indicating an amount of measured current of the DUT. The amplifier system further includes a control circuit operable to control a configuration or mode of the controllable sensing circuit suitable for a particular type of DUT.Type: GrantFiled: October 30, 2018Date of Patent: April 6, 2021Assignee: Analog Devices Global Unlimited CompanyInventors: Simon Nicholas Fiedler Basilico, Yoshinori Kusuda, Camille Louis Huin, Gary Carreau, Gustavo Castro, Sean Patrick Kowalik, Michael C. W. Coln, Scott Andrew Hunt
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Patent number: 10969254Abstract: Fiber Bragg grating interrogation and sensing used for strain and temperature measurements. A simple, broadband light source is used to interrogate one or more fiber Bragg grating (FBG). Specifically, a packaged LED is coupled to fiber, the light therefrom is reflected off a uniform FBG. The reflected light is subsequently analyzed using a filter and a plurality of Si photodetectors. In particular, the filter is a chirped FBG or an optically coated filter, in accordance with some embodiments. Measurement analysis is performed by ratio of intensities at the plurality of detectors, at least in part.Type: GrantFiled: May 21, 2020Date of Patent: April 6, 2021Assignee: ANALOG DEVICES, INC.Inventor: Shrenik Deliwala
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Patent number: 10965303Abstract: Techniques for improving a power supply accuracy of a precision data converter system, such as analog-to-digital converter circuits (ADCs) and digital-to-analog converter circuits (DACs). Improving the power supply accuracy can enable a reference voltage to be as large as possible, thereby increasing the signal-to-noise-ratio (SNR). The techniques can also simplify power supply sequencing requirements for the data converter system.Type: GrantFiled: August 23, 2019Date of Patent: March 30, 2021Assignee: Analog Devices International Unlimited CompanyInventors: Richard James Reay, Richard T Owen, Eric C. Welde
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Patent number: 10964339Abstract: Many processes for audio signal processing can benefit from voice activity detection, which aims to detect the presence of speech as opposed to silence or noise. The present disclosure describes, among other things, leveraging energy-based features of voice and insights on first and second formant frequencies of vowels to provide a low-complexity and low-power voice activity detector. A pair of two channels is provided whereby each channel is configured to detect voice activity in respective frequency bands of interest. Simultaneous activity detected in both channels can be a sufficient condition for determining that voice is present. More channels or pairs of channels can be used to detect different types of voices to improve detection and/or to detect voices present in different audio streams.Type: GrantFiled: July 17, 2019Date of Patent: March 30, 2021Assignee: Analog Devices International Unlimited CompanyInventors: Mikael Mortensen, Kim Spetzler Berthelsen, Robert Adams, Andrew Milia
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Patent number: 10964306Abstract: Active Noise Cancellation (ANC) systems and methods that reduce latency to improve performance. In certain embodiments the systems sample a noise signal using a sample period to create a stream of digital signal data that is representative of the noise signal. A data transport layer carries the digital signal data to a signal processor. The transport layer temporally organizes the digital signal data to place the digital signal data within an initial phase of a sample period. The remaining phase of the sample period is set to a duration that allows the signal processor to process the digital signal data carried in the initial phase and to output the processed data during the same sample period. In this way, the processing of data occurs within one sample period and the latency is reduced and predictable.Type: GrantFiled: August 12, 2014Date of Patent: March 30, 2021Assignee: ANALOG DEVICES, INC.Inventors: Mikael Mortensen, Melissa Nolet, Khiem Quang Nguyen
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Patent number: 10965302Abstract: Digital to analog conversion generates an analog output corresponding to a digital input by controlling unit elements or cells using data bits of the digital input. The unit elements or cells individually make a contribution to the analog output. Due to process, voltage, and temperature variations, the unit elements or cells may have mismatches. The mismatches can degrade the quality of the analog output. To extract the mismatches, a transparent dither can be used. The mismatches can be extracted by observing the analog output, and performing a cross-correlation of the observed output with the dither. Once extracted, the unit elements or cells can be adjusted accordingly to reduce the mismatches.Type: GrantFiled: December 10, 2019Date of Patent: March 30, 2021Assignee: ANALOG DEVICES INTERNATIONAL UNLIMITED COMPANYInventors: Jialin Zhao, Hajime Shibata, Gil Engel
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Publication number: 20210091734Abstract: A multi-stage transimpedance amplifier (TIA) with an adjustable input linear range is disclosed. The TIA includes a first stage, configured to convert a single-ended current signal from an optical sensor of a receiver signal chain to a single-ended voltage signal, and a second stage, configured to convert the single-ended voltage signal provided by the first stage to a differential signal. In such a TIA, the input linear range may be adjusted using a clamp that is programmable with an output offset current to keep the second stage of the TIA from overloading and to maintain a linear transfer function without compression.Type: ApplicationFiled: April 23, 2020Publication date: March 25, 2021Applicant: Analog Devices International Unlimited CompanyInventors: Joseph ADUT, Jeremy WONG, Eugene CHEUNG, Brian HAMILTON, Gregory FUNG
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Publication number: 20210091739Abstract: Systems and methods are provided for circuit configurations that maintain audio playback performance while reducing power consumption. In particular, a gain for a current analog-to-digital converter in an audio playback path is adjusted based on an amplitude of the input signal. Additionally, systems and methods are provided for transitioning between a modes of operation for large signals and mode of operation for small signals.Type: ApplicationFiled: September 24, 2020Publication date: March 25, 2021Applicant: Analog Devices International Unlimited CompanyInventors: Atsushi MATAMURA, Abhishek BANDYOPADHYAY
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Patent number: 10958227Abstract: An amplifier circuit comprises a differential input stage configured to receive a differential input signal, wherein the differential input stage is susceptible to an offset error that includes a linear offset error portion and a nonlinear offset error portion; and an offset error correction circuit coupled to the differential input stage and configured to apply a second order error correction signal to the differential input stage to reduce the nonlinear portion of the offset error.Type: GrantFiled: May 7, 2019Date of Patent: March 23, 2021Assignee: Analog Devices, Inc.Inventor: Quan Wan
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Patent number: 10958452Abstract: A system and device, including reconfigurable physical unclonable functions (‘RPUFs’) and threshold cryptography, use cryptographic and physical means of security. A plurality of reconfigurable physical unclonable functions (‘RPUFs’) and a memory are connected to a processor that is configured to derive information associating the RPUFs with cryptographic shares of a sensitive value, store such information in the memory, and reconfigure a RPUF upon powering up of the device such that information stored in the memory is not valid for the reconfigured RPUF.Type: GrantFiled: June 6, 2017Date of Patent: March 23, 2021Assignee: Analog Devices, Inc.Inventors: John Ross Wallrabenstein, Thomas Joseph Brindisi
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Patent number: 10958281Abstract: Embodiments may relate to a circuit for use in an analog-to-digital converter (ADC) circuit. The circuit may include a first residue amplifier stage and a second residue amplifier stage. The circuit may further include a synthesized delay stage with a digital-to-analog converter (DAC) electrically positioned between a signal input and the input of the second residue amplifier stage. The circuit may further include a resistor electrically positioned between the signal input and the input of the second residue amplifier stage. Other embodiments may be described or claimed.Type: GrantFiled: October 15, 2019Date of Patent: March 23, 2021Assignee: ANALOG DEVICES INTERNATIONAL UNLIMITED COMPANYInventors: Shanthi Pavan Yendluri, Hajime Shibata
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Patent number: 10955493Abstract: A calibration apparatus for calibrating a magnetic sensor configured to generate an output signal indicative of magnetic field strength when a bias signal is applied to it is disclosed. The apparatus includes a test magnetic field generator (MFG) to generate magnetic fields of known magnitude, and further includes a processor to control the MFG to generate a known magnetic field, control the sensor to generate a test output signal when the MFG generates the known magnetic field and a known bias signal is applied to the sensor, and determine how to change the bias signal based on a deviation of the measured test output signal from an expected output signal. Using a test MFG that produces known magnetic fields when known bias signals are applied to sensors allows evaluating and compensating for changes in sensitivity of the sensors by accordingly changing bias signals applied to the sensors.Type: GrantFiled: March 6, 2019Date of Patent: March 23, 2021Assignee: ANALOG DEVICES GLOBAL UNLIMITED COMPANYInventors: Yogesh Jayaraman Sharma, Jochen Schmitt, Paul R. Blanchard
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Publication number: 20210083683Abstract: A dither capacitor, separate from the capacitor sampling the input signal, can be used to inject the additive dither in the switched-capacitor network of the track and hold circuit. This implementation can be referred to as a split-capacitor dither injection. The dither capacitor can be connected to a summing node of the switched-capacitor network. Using a separate capacitor allows the dither to be isolated from the capacitor that is sampling the input signal and avoids kick-back errors.Type: ApplicationFiled: November 16, 2020Publication date: March 18, 2021Applicant: Analog Devices, Inc.Inventor: Ahmed Mohamed Abdelatty ALI
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Patent number: 10950542Abstract: One embodiment is an apparatus comprising a semiconductor integrated circuit (“IC”) chip comprising at least one active component for implementing an amplifier circuit; and a laminate structure comprising a plurality of metal layers, the laminate structure further comprising a plurality of passive components and transmission line-based structures. The semiconductor IC chip is integrated with the laminate structure such that a top layer of the laminate structure comprises a shield over a top of the semiconductor IC chip and the passive components for limiting electromagnetic coupling of signals generated by the amplifier circuit beyond the laminate structure.Type: GrantFiled: March 20, 2019Date of Patent: March 16, 2021Assignee: ANALOG DEVICES, INC.Inventors: Luke Steigerwald, Marc E. Goldfarb, Andrew Pye, Simon Gay
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Patent number: 10948294Abstract: Microelectromechanical systems (MEMS) devices (such as gyroscopes) configured to reject quadrature motion are described. Quadrature motion arises for example when the drive motion of a gyroscope couples to the sense motion of a gyroscope even in the absence of an angular motion. In some circumstances, quadrature motion may result from the fact that the springs used in a gyroscope have slanted sidewall, which can impart torque in the mechanics of the gyroscope. MEMS gyroscope of the type described herein may be configured to reject quadrature motion by using only springs oriented substantially parallel to the drive direction. One such spring includes only beams parallel the drive directions, and optionally. These MEMS gyroscopes may be used to sense, among others, roll and pitch angular rates.Type: GrantFiled: April 5, 2018Date of Patent: March 16, 2021Assignee: Analog Devices, Inc.Inventors: Jeffrey A. Gregory, Charles Blackmer
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Patent number: 10948359Abstract: Techniques for determining a temperature measurement of a junction of a power switch are described. A current can be applied to a control node, e.g., gate terminal, of the power switch, such as a field-effect transistor (FET) or an insulated-gate bipolar transistor (IGBT), while the power switch is in a steady-state region in which a gate-to-source voltage (e.g., FET) or a gate-to-emitter voltage (e.g., IGBT) of the power switch is constant. While in the steady-state region, the temperature measurements can be performed, thereby ensuring accuracy of the measurement.Type: GrantFiled: October 30, 2018Date of Patent: March 16, 2021Assignee: Analog Devices International Unlimited CompanyInventor: Bernhard Strzalkowski
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Patent number: D915310Type: GrantFiled: February 12, 2019Date of Patent: April 6, 2021Assignee: ANALOG DEVICES, INC.Inventor: Tony Pirc
