Patents Assigned to Analog Devices, Inc.
  • Publication number: 20180302100
    Abstract: A time-interleaved digital-to-analog converter (DAC) uses M DAC cores to convert a digital input signal whose digital input words are spread to different DAC cores to produce a final analog outputs. The M DAC cores, operating in a time-interleaved fashion, can increase the sampling rate several times compared to the sampling rate of just one DAC. However, sequential time-interleaving DAC cores often exhibit undesirable spurs at the output. To spread those spurs to the noise floor, the time-interleaving DAC cores can be selected at a pseudo randomized manner or in a specific manner which can break up the sequential or periodic manner of selecting the DAC cores.
    Type: Application
    Filed: April 11, 2018
    Publication date: October 18, 2018
    Applicant: Analog Devices, Inc.
    Inventors: Gil ENGEL, Shawn S. KUO, Steven C. ROSE
  • Patent number: 10102981
    Abstract: A method of fabricating a super-capacitor provides a substrate, and then adds an electrode and electrolyte template film, having a well for receiving the electrode, to the substrate. The method also adds a second electrolyte to the electrode and electrolyte template.
    Type: Grant
    Filed: August 26, 2014
    Date of Patent: October 16, 2018
    Assignee: Analog Devices, Inc.
    Inventors: Yingqi Jiang, Kuang L. Yang
  • Patent number: 10090094
    Abstract: A transformer can include a flexible substrate having at least a first conductive layer and a dielectric layer. The transformer can further include an unbroken toroidal core of a magnetic material. The magnetic material can include material with a relative magnetic permeability greater than unity. The substrate can include a plurality of planar extensions arranged to provide respective windings encircling the core when the planar extensions are folded and attached back to another region of the substrate. Adjacent windings can be conductively isolated from each other. The flexible substrate can further include a second conductive layer separated from the first conductive layer by the dielectric layer. The first conductive layer and the second conductive layer can be coupled via a plurality of interconnects so that the respective windings are formed when the planar extensions are folded and attached back to the another region of the substrate.
    Type: Grant
    Filed: June 6, 2016
    Date of Patent: October 2, 2018
    Assignee: Analog Devices, Inc.
    Inventors: David Bolognia, Vikram Venkatadri
  • Patent number: 10087070
    Abstract: The cap wafer for a MEMS device includes multiple electrically isolated electrodes that can be bonded and electrically connected to separate electrical contacts on a MEMS device wafer. The electrically isolated electrodes can be used for any of a variety of functions, such as for apply a force to a movable MEMS structure on the MEMS device wafer (e.g., for driving resonance of the movable MEMS structure or for adjusting a resonance or sense mode of the movable MEMS structure) or for sensing motion of a movable MEMS structure on the MEMS device wafer. Since the electrodes are electrically isolated, different electrodes may be used for different functions.
    Type: Grant
    Filed: March 6, 2017
    Date of Patent: October 2, 2018
    Assignee: Analog Devices, Inc.
    Inventors: Jeffrey A. Gregory, See-Ho Tsang
  • Patent number: 10081535
    Abstract: One or more conductive shielding plates are formed in a standard ASIC wafer top metal layer, e.g., for blocking cross-talk from MEMS device structure(s) on the MEMS wafer to circuitry on the ASIC wafer when the MEMS device is capped directly by the ASIC wafer in a wafer-level chip scale package. Generally speaking, a shielding plate should be at least slightly larger than the MEMS device structure it is shielding (e.g., a movable MEMS structure such as an accelerometer proof mass or a gyroscope resonator), and the shielding plate cannot be in contact with the MEMS device structure during or after wafer bonding. Thus, a recess is formed to ensure that there is sufficient cavity space away from the top surface of the MEMS device structure. The shielding plate is electrically conductive and can be biased, e.g., to the same voltage as the opposing MEMS device structure in order to maintain zero electrostatic attraction force between the MEMS device structure and the shielding plate.
    Type: Grant
    Filed: June 25, 2013
    Date of Patent: September 25, 2018
    Assignee: Analog Devices, Inc.
    Inventors: Li Chen, Thomas Kieran Nunan, Kuang L. Yang, Jeffrey A. Gregory
  • Patent number: 10078098
    Abstract: A teeter-totter type accelerometer includes one or more platforms configured so as to move in proportion to deformation of the substrate and/or anchor(s). The platform(s) may be in a fixed position relative to the substrate, e.g., by being fixedly attached to the anchor(s) or by being fixedly attached to the substrate, or the platform(s) may be movable relative to the substrate, e.g., by being tethered to the anchor(s) so as to allow the platform(s) to pivot relative to the anchor(s). Electrodes are placed on the substrate underlying the platform(s) for sensing position of the platform(s) relative to the underlying substrate. The teeter-totter proof mass is configured such that it can rotate relative to the platform(s), e.g., by being tethered to the platform(s) or by being tethered to one or more anchors separate from the platform(s). The output of the accelerometer is adjusted based on signals from these platform-sensing electrodes in order to reduce or eliminate offset drift.
    Type: Grant
    Filed: June 23, 2015
    Date of Patent: September 18, 2018
    Assignee: Analog Devices, Inc.
    Inventor: Jianglong Zhang
  • Patent number: 10073113
    Abstract: In one aspect, the disclosure is directed to a MEMS device. The MEMS device includes a silicon-based movable MEMS sensor element. The MEMS device also includes a plurality of wells formed into at least one surface of the movable MEMS sensor element. Each well is filled with at least one metal so as to increase the effective mass of the movable MEMS sensor element. The metal may be tungsten or tantalum, or an alloy with tungsten or tantalum.
    Type: Grant
    Filed: April 24, 2015
    Date of Patent: September 11, 2018
    Assignee: Analog Devices, Inc.
    Inventors: Xin Zhang, Michael Judy
  • Patent number: 10074624
    Abstract: Integrated circuit dies are provide with a passivation layer having a plurality of differently sized openings exposing bond pads for bonding. The sizes of the bond pads vary in a manner that at least partially compensates for stresses during bonding, such as flip chip thermocompression bonding, due to asymmetric distribution of bond pads.
    Type: Grant
    Filed: August 7, 2015
    Date of Patent: September 11, 2018
    Assignee: Analog Devices, Inc.
    Inventor: Vikram Venkatadri
  • Patent number: 10070237
    Abstract: Speakers do not always operate linearly. Linearity of the speaker can affect the quality of the sound produced by the speaker, i.e., causing distortions in the sound, if the nonlinearites are not accounted for. To determine nonlinearities of the speaker, the speaker is often modeled and measurements are made to estimate the characteristics of the speaker based on the model. By using an angle sensor and a light source, a speaker manager can make a direct measurement of excursion or displacement of the speaker. Moreover, when the angle sensor, the light source, and the light beam are configured appropriately with respect to the moving cone of the speaker, the measurement can be substantially linear with respect to the amount of excursion or displacement. Such measurements are far simpler to use and in some cases more accurate than measurements made by other types of systems.
    Type: Grant
    Filed: May 18, 2016
    Date of Patent: September 4, 2018
    Assignee: ANALOG DEVICES, INC.
    Inventors: Christopher M. Hanna, Miguel A. Chavez, Shrenik Deliwala
  • Patent number: 10069441
    Abstract: An electric energy scavenger device has a housing forming an internal chamber with an internal wall, and a movable element contained within the internal chamber. The movable element is freely movable and unconnected to any other movable element within the internal chamber. Within the internal chamber, the device also has a plurality of piezoelectric charge conversion elements positioned along the internal wall. The plurality of piezoelectric charge conversion elements are positioned side-by-side to contact the movable element when the movable element moves within the internal chamber. In addition, the movable element is configured to simultaneously contact at least two of the plurality of side-by-side piezoelectric charge conversion elements. During use, the movable element is freely movable within the internal chamber in response to movement of the entire housing.
    Type: Grant
    Filed: October 21, 2015
    Date of Patent: September 4, 2018
    Assignee: Analog Devices, Inc.
    Inventors: Yingqi Jiang, Qian Zhang, Kuang L. Yang
  • Patent number: 10070286
    Abstract: A electronics control unit is in contemporaneous wireless power communication and wireless data communication with a network of sealed, sensors over a shared bidirectional power antenna. Sensors and sensor networks described below enable the development of networks that are secure and robust, and yet are lighter-weight and lower-cost than, for example, conventional automotive sensor networks.
    Type: Grant
    Filed: May 27, 2016
    Date of Patent: September 4, 2018
    Assignee: Analog Devices, Inc.
    Inventor: Thomas W. Kelly
  • Patent number: 10068894
    Abstract: Low leakage bidirectional clamps and methods of forming the same are provided. In certain configurations, a bidirectional clamp includes a first p-well region, a second p-well region, and an n-well region positioned between the first and second p-wells regions. The bidirectional clamp further includes two or more oxide regions over the n-well region, and one or more n-type active (N+) dummy blocking current regions are positioned between the oxide regions. The one or more N+ dummy leakage current blocking regions interrupt an electrical path from the first p-type well region to the second p-type well region along interfaces between the n-well region and the oxide regions. Thus, even when charge accumulates at the interfaces due to extended high voltage, e.g., >60V, and/or high temperature operation (e.g., >125° C.), the N+ dummy leakage current blocking regions inhibit charge trapping-induced leakage current.
    Type: Grant
    Filed: January 12, 2015
    Date of Patent: September 4, 2018
    Assignee: ANALOG DEVICES, INC.
    Inventors: James Zhao, Javier Alejandro Salcedo
  • Publication number: 20180248706
    Abstract: An authentication system and device including physical unclonable function (PUF) and threshold cryptography comprising: a PUF device having a PUF input and a PUF output and constructed to generate, in response to the input of a challenge, an output value characteristic to the PUF and the challenge; and a processor having a processor input that is connected to the PUF output, and having a processor output connected to the PUF input, the processor configured to: control the issuance of challenges to the PUF input via the processor output, receive output from the PUF output, combine multiple received PUF output values each corresponding to a share of a private key or secret, and perform threshold cryptographic operations. The system and device may be configured so that shares are refreshable, and may be configured to perform staggered share refreshing.
    Type: Application
    Filed: April 24, 2018
    Publication date: August 30, 2018
    Applicant: Analog Devices, Inc.
    Inventor: John Ross Wallrabenstein
  • Patent number: 10062450
    Abstract: In pipelined analog-to-digital converters (ADCs), a passive switched capacitor (PSWC) circuit can be used in a multiplying analog-to-digital converter (MDAC), which generates an analog output being fed to a subsequent stage. Complementary analog input signals are sampled respectively onto first and second capacitors, which are stacked to provide gain. The first capacitor is positioned between a first input switch and an output node of the PSWC circuit, and the second capacitor is positioned between the second input switch and a digital-to-analog converter (DAC) output. The topology advantageously isolates common modes of the complementary analog input signals, the DAC output, and the output of the PSWC circuit. As a result, the topology offers more degrees of freedom in the overall circuit design when stages having the MDAC are cascaded, resulting in pipelined ADCs with a more elegant design with lower noise and lower power consumption.
    Type: Grant
    Filed: June 21, 2017
    Date of Patent: August 28, 2018
    Assignee: ANALOG DEVICES, INC.
    Inventors: Ralph D. Moore, Scott G. Bardsley
  • Patent number: 10054675
    Abstract: Methods, apparatuses, and systems can be provided to implement active feedback to electrically sense or monitor the illumination and shutter pulses and adjust them actively to maintain the desired phase relationship/difference between the pulses. By maintaining the desired phase difference, the distance calculation can be made more accurate, even when conditions of the time-of-flight camera varies (e.g., temperature, aging, etc.). Advantageously, active compensation can correct for errors ‘on-the-fly’, eliminating detailed characterization and manual adjustment during operation.
    Type: Grant
    Filed: October 6, 2015
    Date of Patent: August 21, 2018
    Assignee: ANALOG DEVICES, INC.
    Inventor: Erik D. Barnes
  • Patent number: 10056924
    Abstract: The present disclosure discloses a digital-to-analog converter (DAC) design which is suitable for providing a high output power high-speed DAC, e.g., in radio frequency applications. The DAC design utilizes a parallel DAC structure, e.g., having 8 parallel DACs and an aggregate current output, to provide a high and programmable current output (in some implementations, up to 512 mA or more). The parallel DAC structure alleviates the design problems which exist in trying to output a high amount of current using a single DAC. The DAC design further utilizes a hybrid structure which integrates the signal chain for a more reliable system. In some embodiments, the hybrid structure uses a CMOS process for the current sources and switches and a GaAs cascode stage for combining the outputs to optimally leverage the advantages of both technologies. The result is a highly efficient DAC (with peak output power programmable up to 29 dBm or more).
    Type: Grant
    Filed: February 23, 2015
    Date of Patent: August 21, 2018
    Assignee: ANALOG DEVICES, INC.
    Inventors: Bernd Schafferer, Bing Zhao
  • Patent number: 10056868
    Abstract: An electrical circuit includes a sensor configured to generate a current signal comprising a first portion comprising a contribution from a target source and/or a second portion comprising a contribution from sources other than the target source, a trans-impedance amplifier that amplifies the current signal and generate a low noise signal, and a high pass filter that converts the low noise signal into an AC signal having a positive amplitude, a negative amplitude, and a zero cross-over point between the positive and negative amplitudes. The circuit also includes a positive integrating amplifier that receives the positive amplitude of the AC signal and generates a positive integrated value over an integration period, and a negative integrating amplifier that receives the negative amplitude of the AC signal and generates a negative integrated value over the integration period. The circuit further includes at least one analog-to-digital converter that receives the integrated values.
    Type: Grant
    Filed: July 24, 2015
    Date of Patent: August 21, 2018
    Assignee: ANALOG DEVICES, INC.
    Inventors: Shrenik Deliwala, Steven J. Decker, Dan M. Weinberg
  • Patent number: 10057048
    Abstract: A time-interleaved analog-to-digital converter (ADC) having M ADCs can increase the sampling speed several times compared to the sampling speed of just one ADC. Some time-interleaved ADCs randomize the order of the M ADCs sampling the analog input signal to improve dynamic performance. Randomization causes the output data of the M ADCs to be valid at randomized time instants. When the output data is sampled using a rising edge of a fixed clock, the output data can be valid just before, valid right at, or only valid for a short period of time after, the rising edge. Therefore, the setup or hold time can be very short. To address this issue, information regarding the randomized selection of an ADC is used to control the sampling occurring in the fixed clock domain and avoid the short setup or hold time.
    Type: Grant
    Filed: July 19, 2016
    Date of Patent: August 21, 2018
    Assignee: ANALOG DEVICES, INC.
    Inventor: Eric Otte
  • Publication number: 20180231580
    Abstract: A microelectromechanical system (MEMS) accelerometer is described. The MEMS accelerometer is arranged to limit distortions in the detection signal caused by displacement of the anchor(s) connecting the MEMS accelerometer to the underlying substrate. The MEMS accelerometer may include masses arranged to move in opposite directions in response to an acceleration of the MEMS accelerometer, and to move in the same direction in response to displacement of the anchor(s). The masses may, for example, be hingedly coupled to a beam in a teeter-totter configuration. Motion of the masses in response to acceleration and anchor displacement may be detected using capacitive sensors.
    Type: Application
    Filed: February 7, 2018
    Publication date: August 16, 2018
    Applicant: Analog Devices, Inc.
    Inventor: William A. Clark
  • Patent number: RE47083
    Abstract: A USB-based isolator system conveys USB signals between a pair of galvanically isolated circuit systems and supports controlled enumeration by a downstream device on upstream USB signal lines. The isolator system provides a multi-mode voltage regulator to support multiple voltage supply configurations. The isolator system further provides control systems for each of the isolated circuit systems and provides robust control in a variety of start up conditions. Additionally, the isolator system includes refresh timers and watchdog mechanisms to support persistent operation but manage possible communication errors that can arise between the isolated circuit systems.
    Type: Grant
    Filed: April 27, 2015
    Date of Patent: October 9, 2018
    Assignee: Analog Devices, Inc.
    Inventors: Eric C. Gaalaas, Mark Stewart Cantrell