Patents Assigned to Analog Devices
  • Patent number: 11177815
    Abstract: Provided herein are gap detection and compensation schemes for timing alignment systems. In certain embodiments, a timing alignment system includes a detector that generates one or more loop control signals based on comparing a reference clock signal to a feedback clock signal, a loop filter having a loop voltage that is adjusted based on the one or more loop control signals, and a gap detection and compensation circuit that processes the one or more loop control signals to detect a gap in at least one of the reference clock signal or the feedback clock signal. In response to detecting the gap, the gap detection and compensation circuit modifies the one or more loop control signals to provide an adjustment to the loop voltage.
    Type: Grant
    Filed: February 25, 2021
    Date of Patent: November 16, 2021
    Assignee: Analog Devices International Unlimited Company
    Inventors: Siwen Liang, Marlon Consuelo Maramba, Alberto Marinas
  • Patent number: 11177816
    Abstract: Apparatus and methods for clock synchronization and frequency translation are provided herein. Clock synchronization and frequency translation integrated circuits (ICs) generate one or more output clock signals having a controlled timing relationship with respect to one or more reference signals. The teachings herein provide a number of improvements to clock synchronization and frequency translation ICs, including, but not limited to, reduction of system clock error, reduced variation in clock propagation delay, lower latency monitoring of reference signals, precision timing distribution and recovery, extrapolation of timing events for enhanced phase-locked loop (PLL) update rate, fast PLL locking, improved reference signal phase shift detection, enhanced phase offset detection between reference signals, and/or alignment to phase information lost in decimation.
    Type: Grant
    Filed: October 19, 2020
    Date of Patent: November 16, 2021
    Assignee: Analog Devices, Inc.
    Inventors: Neil E. Weeks, Reuben P. Nelson
  • Patent number: 11176347
    Abstract: Systems and methods described herein relate to fingerprint-on-display recognition. In particular, the systems and methods described herein may recognize a fingerprint when a finger of a user is placed on a display and authenticate the user based on the recognized fingerprint. Further, the embodiments described herein may utilize multiple colors and/or secondary factors to reduce erroneous authentications of the user. The approaches may improve the accuracy of fingerprint authentication by using the multiple colors and/or secondary factors.
    Type: Grant
    Filed: June 12, 2020
    Date of Patent: November 16, 2021
    Assignee: ANALOG DEVICES INTERNATIONAL UNLIMITED COMPANY
    Inventors: Patrick Riehl, Gary Carreau, Richard J. Capistran, Kenneth M. Feen, Brian Jeffrey Wengreen
  • Publication number: 20210351901
    Abstract: RF systems configured to implement full-duplex wireless data transfer for rotary joints are disclosed. An example RF system includes a 60 GHz short distance communication link implemented using elliptically (e.g., circularly) polarized antennas. Such a system may provide a mm-wave, high-speed, wideband wireless communication link in a manner that is associated with simpler design and operation, mechanical integrity, and reduced power consumption, compared to alternative solutions.
    Type: Application
    Filed: April 9, 2021
    Publication date: November 11, 2021
    Applicant: Analog Devices International Unlimited Company
    Inventors: Mohamed Alaaeldin Moharram HASSAN, Po-Hao David A. YEH, Mark A. D'AMATO, Anton PATYUCHENKO, John N. POELKER, Christopher P. O'NEILL, Omar El Sayed WADAH
  • Publication number: 20210349123
    Abstract: Microelectromechanical system (MEMS) accelerometers are described. The MEMS accelerometers may include multiple proof mass portions collectively forming one proof mass. The entirety of the proof mass may contribute to detection of in-plane acceleration and out-of-plane acceleration. The MEMS accelerometers may detect in-plane and out-of-plane acceleration in a differential fashion. In response to out-of-plane accelerations, some MEMS accelerometers may experience butterfly modes, where one proof mass portion rotates counterclockwise relative to an axis while at the same time another proof mass portion rotates clockwise relative to the same axis. In response to in-plane acceleration, the proof mass portions may experience common translational modes, where the proof mass portions move in the plane along the same direction.
    Type: Application
    Filed: July 20, 2021
    Publication date: November 11, 2021
    Applicant: Analog Devices, Inc.
    Inventor: Xin Zhang
  • Patent number: 11171662
    Abstract: Herein disclosed is an example analog-to-digital converter (ADC) and methods that may be performed by the ADC. The ADC may derive a first code that approximates a combination of an analog input value of the ADC and a dither value for the ADC sampled on a capacitor array. The ADC may further derive a second code to represent a residue of the combination with respect to the first code applied to the capacitor array. The ADC may combine the numerical value of the first code and the numerical value of the second code to produce a combined code applied to the capacitor array for deriving a digital output code. Combining the numerical value of the first code and the numerical value of the second code in the digital domain can provide for greater analog-to-digital (A/D) conversion linearity.
    Type: Grant
    Filed: August 11, 2020
    Date of Patent: November 9, 2021
    Assignee: ANALOG DEVICES, INC.
    Inventor: Jesper Steensgaard-Madsen
  • Patent number: 11169218
    Abstract: A difference amplifier can be used for providing an amplified representation of a sensed current through a load device. A separate signal path can be used to provide fast fault detection, without requiring use of the difference amplifier. For example, a voltage scaling circuit can be used to scale a differential input signal indicative of the load current. The scaled representation can then be compared against a specified threshold corresponding to a fault current value. In this manner, a high-speed low-voltage comparator can be used to provide detection of a fault current that otherwise exceeds an input range of the difference amplifier, where the difference amplifier is used separately for precision current monitoring. As an illustrative example, such a scheme can provide fault detection even when an input of the difference amplifier is saturated.
    Type: Grant
    Filed: December 21, 2018
    Date of Patent: November 9, 2021
    Assignee: Analog Devices, Inc.
    Inventors: Quan Wan, Brian A. Pelletier
  • Patent number: 11169426
    Abstract: A Liquid Crystal Waveguide (LCW) system can provide sub-aperture incoupling or outcoupling of light having an input wavelength and input beamsize defining an aperture characteristic of the system. A Liquid Crystal Waveguide (LCW) can include a generally planar LCW core to receive light via a light input zone for communication toward a light output zone. Sub-aperture interfacial light couplers can be planarly arranged in or parallel to the planar LCW core in the light input zone or the light output zone. Sub-aperture interfacial light couplers can include teeth, prisms, or facets, a photonic crystal metasurface, or a geometric-phased holograph (GPH)). Overall LCW thickness can be reduced, which can be helpful in space-limited applications or for reducing material costs.
    Type: Grant
    Filed: March 19, 2019
    Date of Patent: November 9, 2021
    Assignee: Analog Devices, Inc.
    Inventors: Michael Ziemkiewicz, Michael Howard Anderson, Tyler Adam Dunn, David Edward Fish, Scott Dennis Rommel, Andrew William Sparks, Scott Robert Davis
  • Patent number: 11170313
    Abstract: One factor in limiting the speed of conventional implementations of mixture models is that the algorithm involves many decisions where different operations are fetched and performed depending on the outcome of the decisions. These decisions cause flushing of the pipeline, and thus prevent the realization of a highly parallel pipeline in a processor. Without parallelism, the throughput of the pipeline in the processor, i.e., the ability to process many samples of the digital input at a time, is limited. To alleviate this issue, implementation of the mixture model is reformulated, among other things, by embedding decisions into the process flow as multiplicative factors. The resulting implementation alleviates the need to use if-else statements for the decisions and reduces the number of times the pipeline has to be flushed. The implementation enables a pipeline with a higher degree of parallelism and thereby increases throughput and speed of the implementation.
    Type: Grant
    Filed: December 18, 2014
    Date of Patent: November 9, 2021
    Assignee: Analog Devices International Unlimited Company
    Inventor: Raka Singh
  • Patent number: 11171643
    Abstract: A switching circuit can help reduce electrical feedback ringing at a gate terminal of a transistor. The switching circuit can include a transistor circuit to switch an electrical signal and a control circuit to provide an actuation signal to the gate terminal of the transistor device. The switching circuit can also include a booster circuit that is disposed between the control circuit and the gate terminal of the transistor device. The booster circuit can be configured to detect a signal from the control circuit to turn off the transistor device and, responsive to the detected signal, drive a current into the gate terminal of the transistor device for a specified span of time before the transistor device turns off.
    Type: Grant
    Filed: May 29, 2020
    Date of Patent: November 9, 2021
    Assignee: Analog Devices International Unlimited Company
    Inventor: Martin Murnane
  • Patent number: 11171559
    Abstract: An electronic circuit comprises a power switch and a fault detection circuit. The power switch circuit includes a power switch transistor. The fault detection circuit includes a comparator circuit configured to monitor a voltage across the power switch transistor and compare the voltage to a varying threshold voltage that decreases with time, and produce an indication of a circuit fault when the voltage of the power switch transistor is greater than the time varying threshold voltage.
    Type: Grant
    Filed: December 16, 2019
    Date of Patent: November 9, 2021
    Assignee: Analog Devices International Unlimited Company
    Inventors: Steven John Tanghe, Brian K. Jadus
  • Publication number: 20210341959
    Abstract: An example current mirror arrangement includes a current mirror circuit, configured to receive an input current signal at an input transistor Q1 and output a mirrored signal at an output transistor Q2. The arrangement further includes a semi-cascoding circuit that includes transistors Q3, Q4, and a two-terminal passive network. The transistor Q3 is coupled to, and forms a cascode with, the output transistor Q2. The transistor Q4 is coupled to the transistor Q3. The base/gate of the transistor Q3 is coupled to a bias voltage Vref, and the base/gate of the transistor Q4 is coupled to a bias voltage Vref1 via the two-terminal passive network. Nonlinearity of the output current from such a current mirror arrangement may be reduced by selecting appropriate impedance of the two-terminal passive network and selecting appropriate bias voltages Vref and Vref1.
    Type: Application
    Filed: April 29, 2020
    Publication date: November 4, 2021
    Applicant: Analog Devices, Inc.
    Inventors: Devrim AKSIN, Omid FOROUDI
  • Publication number: 20210344348
    Abstract: Embodiments may relate to techniques or circuitry for the control of a clock signal by a phase-locked loop (PLL) circuit. The technique may include the identification of a first parameter related to a gain of a digitally controlled oscillator (DCO) and a second parameter related to a resolution of a time-to-digital converter (TDC). The technique may then include the identification of a third parameter related to filter coefficients of a loop filter of the PLL circuit based on the first and second parameter. The circuit may then output a clock signal based on the first, second, and third parameters. Other embodiments may be described or claimed.
    Type: Application
    Filed: April 29, 2020
    Publication date: November 4, 2021
    Applicant: Analog Devices International Unlimited Company
    Inventors: Wreeju BHAUMIK, Batna SURYANARAYANA, Dheeraj ARIMBOOR
  • Publication number: 20210338190
    Abstract: Devices, systems, and methods for non-invasively detecting and monitoring medical conditions using multiple modalities of sensing include at least two electrodes configured to be positioned on a subject, an acoustic sensor configured to be positioned on a subject, a thoracic impedance measurement module connected to the electrodes, for measuring a first impedance between the electrodes, and a heart acoustic measurement module connected to the acoustic sensor, for detecting and measuring a heart sound from the acoustic sensor.
    Type: Application
    Filed: July 12, 2021
    Publication date: November 4, 2021
    Applicant: Analog Devices International Unlimited Company
    Inventors: Venugopal GOPINATHAN, Tony J. AKL
  • Patent number: 11165431
    Abstract: An apparatus is described and includes a current integrating phase interpolator core having a programmable bias current; an AC-coupled inverter circuit coupled to an output of the current integrating phase interpolator core for receiving a signal comprising a periodic sawtooth waveform therefrom; a digital-to-analog (D/A) converter for setting an input common mode voltage of the AC-coupled inverter circuit; a duty cycle measurement (DCM) circuit for measuring a duty cycle distortion (DCD) of a rectangular wave clock signal output from the AC-coupled inverter circuit; and a circuit for computing a difference in the DCD of the rectangular wave clock signal when the input common mode voltage of the AC-coupled inverter circuit is set to a high voltage and when the input common mode voltage of the AC-coupled inverter circuit is set to a low voltage.
    Type: Grant
    Filed: December 9, 2020
    Date of Patent: November 2, 2021
    Assignee: Analog Devices, Inc.
    Inventor: John Kenney
  • Patent number: 11165434
    Abstract: Systems for monitoring or control can include reconfigurable input and output channels. Such reconfigurable channels can include as few as a single terminal and a ground pin, or such channels can include three or four terminal configuration such as for use in four-terminal resistance measurements. Channel reconfiguration can be accomplished such as using software-enabled or firmware-enabled control of channel hardware. Such channel hardware can include analog-to-digital and digital-to-analog conversion capability, including use of a digital-to-analog converter to provide field power or biasing. In an example, compensation can be provided to suppress a leakage current from flowing through a digital output to a load connected to the reconfigurable channel terminal, particularly when the digital output is disabled.
    Type: Grant
    Filed: March 13, 2020
    Date of Patent: November 2, 2021
    Assignee: Analog Devices International Unlimited Company
    Inventors: Donal G. O'Sullivan, Aidan J. Cahalane, Patrick C. Kirby, Catherine J. Redmond, Derrick Hartmann, Bride Ni Riagain
  • Publication number: 20210330212
    Abstract: Determining bio-impedance of a body, or portion thereof, of a subject has been utilized for determining health characteristics (such as heart conditions) of the subject. The systems and procedures described herein may provide for correction and/or compensation for electrode contact impedance and for accurately determining bio-impedance. The system may take into account impedance sensitivity and/or frequency sensitivity when performing the bio-impedance determination to improve the bio-impedance determination.
    Type: Application
    Filed: July 8, 2021
    Publication date: October 28, 2021
    Applicant: Analog Devices International Unlimited Company
    Inventors: Sriram GANESAN, Venugopal GOPINATHAN, Tony J. AKL
  • Patent number: 11159169
    Abstract: Analog circuits are often non-linear, and the non-linearities can hurt performance. Designers would trade off power consumption to achieve better linearity. An efficient and effective calibration technique can address the non-linearities and reduce the overall power consumption. A dither signal injected to the analog circuit can be used to expose the non-linear behavior in the digital domain. To detect the non-linearities, a counting approach is applied to isolate non-linearities independent of the input distribution. The approach is superior to and different from other approaches in many ways.
    Type: Grant
    Filed: May 18, 2020
    Date of Patent: October 26, 2021
    Assignee: ANALOG DEVICES, INC.
    Inventors: Ahmed Mohamed Abdelatty Ali, Paridhi Gulati
  • Publication number: 20210325328
    Abstract: Accurately measuring bio-impedance is important for sensing properties of the body. Unfortunately, contact impedances can significantly degrade the accuracy of bio-impedance measurements. To address this issue, circuitry for implementing a four-wire impedance measurement can be configured to make multiple current measurements. The multiple current measurements set up a system of equations to allow the unknown bio-impedance and contact impedances to be derived. The result is an accurate bio-impedance measurement that is not negatively impacted by large contact impedances. Moreover, bad contacts with undesirably large impedances can be identified.
    Type: Application
    Filed: June 28, 2021
    Publication date: October 21, 2021
    Applicant: Analog Devices International Unlimited Company
    Inventors: Jose Carlos Conchell ANO, Javier CALPE MARAVILLA, Liam Patrick RIORDAN
  • Patent number: 11152975
    Abstract: Isolators for high frequency signals transmitted between two circuits configured to operate at different voltage domains are provided. The isolators may include resonators capable of operating at high frequencies with high transfer efficiency, high isolation rating, and a small substrate footprint. In some embodiments, the isolators may operate at a frequency not less than 20 GHz, not less than 30 GHz, not less than 65 GHz, or between 20 GHz and 100 GHz, including any value or range of values within such range. The isolators may include inductive loops with slits and capacitors integrally formed at the slits. The sizes and shapes of the inductive loops and capacitors may be configured to control the values of equivalent inductances and capacitances of the isolators. The isolators are compatible to different fabrication processes including, for example, micro-fabrication and PCB manufacture processes.
    Type: Grant
    Filed: October 16, 2019
    Date of Patent: October 19, 2021
    Assignee: Analog Devices International Unlimited Company
    Inventors: Paul Lambkin, Baoxing Chen, Jinglin Xu, Ramji Lakshmanan