Patents Assigned to Analog Devices, Inc.
  • Patent number: 10180448
    Abstract: A delta-sigma modulator circuit comprising: an integrator circuit configured to produce an integrator output signal that represents an integration of an analog input signal, a comparator output signal and a periodic signal; a comparator circuit configured to produce the comparator output signal in response to a comparison of the integrator output signal with a first reference signal; and a periodic signal generation circuit configured to produce the periodic signal.
    Type: Grant
    Filed: May 4, 2016
    Date of Patent: January 15, 2019
    Assignee: Analog Devices, Inc.
    Inventors: Gabriele Bernardinis, Michael Daly
  • Patent number: 10177897
    Abstract: Serial data transfer uses ever increasing transmission rates. The data transfer rate of a clock-and-data recovery (CDR) deserializer can be increased by using multiple independent sampler blocks that process serial input data in parallel. For this purpose, the clock output signals from the various independent blocks are first mutually aligned in proper order using a lower speed clock, and subsequently offset from one another such that sampling instances of the various sampler blocks are interleaved. Digitized data words corresponding to common input data and outputted by the various sampler blocks are compared after alignment of the clock output signals to correct additional timing misalignment between the multiple sampler blocks. The digitized data words need only be aligned once or at most infrequently after the clock output signals are aligned, since the additional timing misalignment is caused mainly path delays that are substantially invariant over time.
    Type: Grant
    Filed: October 7, 2016
    Date of Patent: January 8, 2019
    Assignee: ANALOG DEVICES, INC.
    Inventors: Robert Schell, Robert D. Bishop
  • Patent number: 10177717
    Abstract: For broadband data communication, a data signal voltage at a signal input node can be converted to an output signal current at a signal output node. A first transistor device can contribute to the output signal current, with its transconductance or other gain reduced to accommodate larger signal swings, at which a second transistor can turn on and increase an effective resistance value of at least a portion of a gain degeneration resistor associated with the first transistor device. The second transistor can also contribute to the output signal current to help maintain or enhance an overall gain between the signal input node and the signal output node. Multiple secondary stages, push-pull arrangements, buffer amplifier configurations (which may or may not contribute to current in the gain degeneration resistor), input and output transformers, negative feedback to help reduce component variability, and frequency modification circuits or components are also described.
    Type: Grant
    Filed: March 13, 2017
    Date of Patent: January 8, 2019
    Assignee: Analog Devices, Inc.
    Inventors: Chris J. Day, David Frank, Michael Glasbrener
  • Patent number: 10177566
    Abstract: Apparatus and methods for actively-controlled trigger and latch release thyristor are provided. In certain configurations, an actively-controlled protection circuit includes an overvoltage sense circuit, a thyristor or silicon controlled rectifier (SCR) that is electrically connected between a signal node and a discharge node, and an active trigger and latch release circuit. The overvoltage sense circuit controls a voltage of a dummy supply node based on a voltage of the signal node, and the active trigger and latch release circuit detects presence of a transient overstress event at the signal node based on the voltage of the dummy supply node. The active trigger and latch release circuit provides one or more trigger signals to the SCR to control the SCR's activation voltage, and the active trigger and latch release circuit activates or deactivates the one or more trigger signals based on whether or not the transient overstress event is detected.
    Type: Grant
    Filed: June 21, 2016
    Date of Patent: January 8, 2019
    Assignee: ANALOG DEVICES, INC.
    Inventors: James Zhao, Javier Alejandro Salcedo, Srivatsan Parthasarathy
  • Patent number: 10168194
    Abstract: Various embodiments mitigate the risk of frequency-lock in systems having multiple resonators by dynamically changing the frequency at which at least one of the resonators is driven. More particularly, the drive frequency of at least one of the resonators is changed often enough that the multiple resonators do not have time to achieve frequency lock. Changes in the oscillation of the resonators may be analyzed to determine, for example, acceleration of such systems. Some embodiments implement self-test by assessing expected performance of a system with toggling drive frequencies. More particularly, some embodiments implement self-test by artificially inducing displacement of a movable member of a system.
    Type: Grant
    Filed: December 24, 2015
    Date of Patent: January 1, 2019
    Assignee: Analog Devices, Inc.
    Inventors: Gaurav Vohra, William A. Clark, Mehrnaz Motiee
  • Patent number: 10167189
    Abstract: A MEMS product includes a stress-isolated MEMS platform surrounded by a stress-relief gap and suspended from a substrate. The stress-relief gap provides a barrier against the transmission of mechanical stress from the substrate to the platform.
    Type: Grant
    Filed: September 30, 2014
    Date of Patent: January 1, 2019
    Assignee: Analog Devices, Inc.
    Inventors: Xin Zhang, Michael W. Judy, George M. Molnar, Christopher Needham, Kemiao Jia
  • Patent number: 10158029
    Abstract: Apparatus and methods for compound semiconductor protection clamps are provided herein. In certain configurations, a compound semiconductor protection clamp includes a resistor-capacitor (RC) trigger network and a metal-semiconductor field effect transistor (MESFET) clamp. The RC trigger network detects when an ESD/EOS event is present between a first node and a second node, and activates the MESFET clamp in response to detecting the ESD/EOS event. When the MESFET clamp is activated, the MESFET clamp provides a low impedance path between the first and second nodes, thereby providing ESD/EOS protection. When deactivated, the MESFET clamp provides high impedance between the first and second nodes, and thus operates with low leakage current and small static power dissipation.
    Type: Grant
    Filed: February 23, 2016
    Date of Patent: December 18, 2018
    Assignee: Analog Devices, Inc.
    Inventors: Srivatsan Parthasarathy, Javier Alejandro Salcedo
  • Publication number: 20180352875
    Abstract: Techniques for wirelessly charging smart textiles, such as smart garments, are provided. Aspects of the present application provide a smart garment device with an array of integrated coils and rectifiers that enable wireless charging of the device from a drawer or other enclosure that produces a roughly uniform AC magnetic field. The smart garment can draw power from the magnetic field once placed within the enclosure, regardless of how the garment is placed in the enclosure. The method can be applied to garments of any shape, and multiple garments can be charged simultaneously by placing the multiple garments into the same magnetic field.
    Type: Application
    Filed: June 11, 2018
    Publication date: December 13, 2018
    Applicant: Analog Devices, Inc.
    Inventor: Patrick Stanley Riehl
  • Publication number: 20180352639
    Abstract: Systems and methods are provided for an automatic exposure detection feature for adding to an x-ray panel readout device, including an imaging panel having a low power mode, a sense circuit for receiving an input signal in the low power mode and restricting an input signal voltage to a first voltage, and a sensor for sensing a change in the input signal voltage, wherein the change in input signal voltage indicates exposure to an x-ray signal.
    Type: Application
    Filed: May 31, 2018
    Publication date: December 6, 2018
    Applicant: Analog Devices, Inc.
    Inventor: Gary R. CARREAU
  • Publication number: 20180351753
    Abstract: One or more hardware identity circuits (which may be reconfigurable) may be employed in a device or system in order to impose a tampering penalty, preferably without relying on battery-backed volatile memory to do so. The device or system may also include a cryptographic division and distribution (‘sharing’) of a secret internal to the device or system.
    Type: Application
    Filed: June 6, 2017
    Publication date: December 6, 2018
    Applicant: Analog Devices, Inc.
    Inventors: Douglas J. Gardner, John Ross Wallrabenstein
  • Publication number: 20180351754
    Abstract: A system and device including reconfigurable physical unclonable functions (‘RPUFs’) and threshold cryptography uses 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: Application
    Filed: June 6, 2017
    Publication date: December 6, 2018
    Applicant: Analog Devices, Inc.
    Inventors: John Ross Wallrabenstein, Thomas Joseph Brindisi
  • Publication number: 20180351752
    Abstract: Various embodiments enhance security and tamper resistance of device or components having a hardware intrinsic identity. For example, devices or components having PUFs can map challenges and helper values to a secret or share of secret to utilize a local identity in cryptographic operations. A plurality of components having individual identities can be extend so that the plurality of components can enroll into a shared global identity. Shares of the global identity can be distributed among the plurality of components or devices such that at least two devices must provide at least two shares of the global identity (or threshold operations on the at least two shares) to successfully use the global identity. Such sharing mitigates adversarial tampering attack o the global identity. Share refresh protocols can provide additional security, enable introduction of new components or devices to the global identity, and allow removal of existing components or devices.
    Type: Application
    Filed: June 2, 2017
    Publication date: December 6, 2018
    Applicant: Analog Devices, Inc.
    Inventors: John Ross Wallrabenstein, Thomas Joseph Brindisi
  • Publication number: 20180348121
    Abstract: System and apparatus for portable gas detection. Specifically, this disclosure describes apparatuses and systems for optical gas detection in a compact package. There is a need for a very compact, low-power, gas detection system for gases such as CO2, NOx, water vapor, methane etc. This disclosure provides an ultra-compact and highly efficient optical measurement system based on principals of optical absorption spectroscopy. It reduces the size of the instrument as well its power consumption by more than an order of magnitude making it possible to deploy it widely. There is an identified need for large number of distributed gas sensors to improve human health, environment, and save energy usage.
    Type: Application
    Filed: May 30, 2018
    Publication date: December 6, 2018
    Applicant: Analog Devices, Inc.
    Inventor: Shrenik DELIWALA
  • Publication number: 20180348806
    Abstract: In an example embodiment, a circuit is provided that includes a current source with a calibrated trim circuit whose output current varies with transconductance of the current source, and tracks a current mismatch between the current source and another current source under varying bias currents and temperatures. The trim circuit may include at least one calibration digital to analog converter (CAL DAC), which may be driven by a bias circuit generating current proportional to the transconductance of the current source. In an example embodiment, the trim circuit may include at least two CAL DACs, whose output current may vary with bias current only, and with bias current and temperature. A method to calibrate the CAL DACs includes varying calibration settings of the CAL DACs under different bias currents until the output current of the trim circuit substantially accurately tracks the current mismatch under disparate bias currents and temperatures.
    Type: Application
    Filed: August 13, 2018
    Publication date: December 6, 2018
    Applicant: Analog Devices, Inc.
    Inventors: Haiyang ZHU, Wenhua W. YANG, Nathan T. EGAN
  • Publication number: 20180338696
    Abstract: System and apparatus for measuring biopotential and implementation thereof. A device for mitigating electromagnetic interference (EMI) thereby increasing signal-to-noise ratio is disclosed. Specifically, the present disclosure relates to an elegant, novel circuit for measuring a plurality of biopotentials in useful in a variety of medical applications. This allows for robust, portable, low-power, higher S/N devices which have historically required a much bigger footprint.
    Type: Application
    Filed: May 24, 2018
    Publication date: November 29, 2018
    Applicant: Analog Devices, Inc.
    Inventor: Shrenik DELIWALA
  • Patent number: 10141763
    Abstract: A soft start amplifier provides a soft-start function that controls a battery charging current in a feedback loop charging circuit by selecting the lowest voltage between a soft start voltage and an error derived control voltage. The lowest voltage is used as a control signal for controlling the battery charging current in the feedback loop charging circuit. The error voltage is a difference between a voltage proportional to the charging current and a voltage proportional to the target charging current while the soft start voltage is a voltage configured to ramp up with time. Using the lower voltage of the error voltage and the soft start voltage reduces the inrush current that may occur when the error derived control voltage spikes to the supply voltage in an attempt to correct the initial difference between the target charging current and a measured charging current.
    Type: Grant
    Filed: September 7, 2016
    Date of Patent: November 27, 2018
    Assignee: Analog Devices, Inc.
    Inventors: Sandro Herrera, Alan K Jeffery
  • Patent number: 10141107
    Abstract: An inductive device may include a pair of half-shell magnetically-conductive housings joined together and defining an enclosed cavity between them. The inductive device may also include primary and secondary windings provided spatially within the cavity providing magnetic coupling between them. The windings may be electrically insulated from each other and terminals of the primary and secondary windings may traverse to an exterior of the inductive device.
    Type: Grant
    Filed: March 12, 2014
    Date of Patent: November 27, 2018
    Assignee: Analog Devices, Inc.
    Inventors: Check F. Lee, James Doscher
  • Patent number: 10139869
    Abstract: Mobile devices are increasing aware of the environment surrounding the mobile devices. In many applications, it is useful for the mobile device to be able to sense different types of hand grips and/or where fingers are positioned with respect to the mobile device. The present disclosure describes a capacitive sensing apparatus particularly suitable for sensing hand grips and/or finger tracking along edges of a mobile device. The capacitive sensing apparatus comprises strips arranged along two lines, and the respective lengths and spacing are designed to allow optimal response behavior for sensing hand grips and/or tracking fingers.
    Type: Grant
    Filed: July 23, 2014
    Date of Patent: November 27, 2018
    Assignee: ANALOG DEVICES, INC.
    Inventor: Isaac Chase Novet
  • Patent number: 10131538
    Abstract: A MEMS device has a substrate with a structure surface and an opposing exterior surface, microstructure formed on the structure surface of the substrate, and a cap coupled with the substrate to form a hermetically sealed interior chamber containing the microstructure. The substrate forms a trench extending from, and being open to, the opposing exterior surface to produce a sensor region and a second region. Specifically, the second region is radially outward of the sensor region. The MEMS device also has a spring integrally formed at least in part within the trench to mechanically connect the sensor region and the second region, and other structure integral with the substrate. The spring or the other structure at least in part hermetically seal the interior chamber.
    Type: Grant
    Filed: September 14, 2015
    Date of Patent: November 20, 2018
    Assignee: Analog Devices, Inc.
    Inventors: Bradley C. Kaanta, Kemiao Jia
  • Patent number: 10135459
    Abstract: A low power high precision mixed signal analog to digital converter is provided for processing biometric signals in the presence of a large interferer signal for cableless patient monitoring; a capacitive difference circuit produces an analog difference signal by differencing an analog feedback loop signal and an input signal; an analog-to-digital converter sigma delta converter produces a digital version of the difference signal, a digital feedback loop includes a digital integrator and a capacitive digital-to-analog converter configured to produce the analog loop feedback signal based upon the digital version of the difference.
    Type: Grant
    Filed: October 25, 2016
    Date of Patent: November 20, 2018
    Assignee: Analog Devices, Inc.
    Inventors: Yogesh Jayaraman Sharma, Arthur J. Kalb