Patents Assigned to Analog Devices
  • Publication number: 20220045685
    Abstract: Embodiments of the present disclosure provide systems and methods for realizing phase synchronization updates based on an input system reference signal SYSREF without the need to synchronously distribute the SYSREF signal on a high-speed domain. In particular, phase synchronization mechanisms of the present disclosure are based on keeping a first phase accumulator in the device clock domain and using a second phase accumulator in the final digital clock domain to asynchronously transmit phase updates to the final digital clock domain. Arrival of a new SYSREF pulse may be detected based on the counter value of the first phase accumulator, which value is asynchronously transferred and scaled to the second phase accumulator downstream. In this manner, even though the SYSREF signal itself is not synchronously transferred to the second phase accumulator, the phase updates from the SYSREF signal may be transferred downstream so that the final phase may be generated deterministically.
    Type: Application
    Filed: March 31, 2021
    Publication date: February 10, 2022
    Applicant: Analog Devices International Unlimited Company
    Inventors: Alexander LEONARD, Lu WU, Christopher MAYER, Gord ALLAN
  • Publication number: 20220043937
    Abstract: Physical Unclonable Functions, PUFs, are hardware devices designed to generate a number that is random (i.e., two identical PUFs should produce randomly different numbers from each other) and persistent (i.e., a PUF should consistently generate the same number over time). Over time, aspects of the PUF hardware may change or drift, which may ultimately cause the generated number to change, and therefore no longer be persistent. Failure to generate a persistent number may cause difficulties for other devices that rely on the persistence of the number generated by the PUF, for example as part of a cryptographic process. The present disclosure relates to monitoring over time the physical characteristics of the PUF that are used to generate its number, and thereby keep track of its reliability to generate a random number that is persistent.
    Type: Application
    Filed: August 5, 2020
    Publication date: February 10, 2022
    Applicant: Analog Devices International Unlimited Company
    Inventors: George Redfield Spalding, Jonathan Ephraim David Hurwitz, William Michael James Holland
  • Publication number: 20220045871
    Abstract: Physical unclonable functions (PUFs) are described. The PUFs utilize intrinsic information to determine the confidence level of comparison values. The information about confidence levels may be used to simplify the process of recovering the PUF secret. Since the information about confidence levels may be intrinsic, and not know outside the PUF, the PUF may be secure.
    Type: Application
    Filed: August 5, 2020
    Publication date: February 10, 2022
    Applicant: Analog Devices, Inc.
    Inventor: Chiraag Juvekar
  • Publication number: 20220045687
    Abstract: Calibration of continuous-time (CT) residue generation systems can account and compensate for mismatches in magnitude and phase that may be caused by fabrication processes, temperature, and voltage variations. In particular, calibration may be performed by providing one or more known test signals as an input to a CT residue generation system, analyzing the output of the system corresponding to the known input, and then adjusting one or more parameters of a forward and/or a feedforward path of the system so that the difference in transfer functions of these paths may be reduced/minimized. Calibrating CT residue generation systems using test signals may help decrease the magnitude of the residue signals generated by such systems, and, consequently, advantageously increase an error correction range of such systems or of further stages that may use the residue signals as input.
    Type: Application
    Filed: July 30, 2021
    Publication date: February 10, 2022
    Applicant: Analog Devices International Unlimited Company
    Inventors: Victor KOZLOV, Sharvil Pradeep PATIL, Hajime SHIBATA
  • Publication number: 20220045694
    Abstract: Systems and methods for improving noise efficiency in a Delta Sigma modulator. A bypass scheme for a noise splitter is disclosed that reduces toggling activity for small signals. In particular, a sample-by-sample bypass noise splitter is disclosed that includes a noise splitting module and a bypass line. The bypass line bypasses the noise splitting module when signals are below a selected threshold, increasing efficiency of the system.
    Type: Application
    Filed: August 6, 2021
    Publication date: February 10, 2022
    Applicant: Analog Devices, Inc.
    Inventors: Abhishek BANDYOPADHYAY, Preston S. BIRDSONG, Adam R. SPIRER
  • Publication number: 20220045872
    Abstract: The present disclosure relates to configuring at least one pair of devices in a physical unclonable function (PUF) apparatus and reading out at least one pair of devices for determining a persistent random PUF output. The pair of devices may be readout by measuring a physical difference between the devices/components caused by random manufacturing differences, which may then be used to determine a persistence random PUF output. Configuring the pair of devices includes measuring the random manufacturing difference and, based on that measurement, setting a readout condition for the pair of devices, which dictates aspects of the readout process that should be used for that pair of devices. Each time the pair of devices is readout in the future, it may be readout in accordance with the condition that was set at configuration.
    Type: Application
    Filed: August 5, 2020
    Publication date: February 10, 2022
    Applicant: Analog Devices International Unlimited Company
    Inventors: William Michael James Holland, George Redfield Spalding, Jonathan Ephraim David Hurwitz
  • Publication number: 20220046336
    Abstract: Systems and methods are provided for a distributed mufti-sensor witness integrity sensing platform (WISP) approach which allows for positioning of sensors in an enclosed space. In particular, a WISP platform is divided into two modules, with a base module is connected to multiple edge sensor modules with a wired connection. In general, splitting up the distributed WISP system described herein allows multiple sensors to be placed in an enclosed (and generally inaccessible) location. The senor data can be transmitted from the multiple edge sensor modules via a connection to the base module. Additionally, the use of the two module system as provided herein allows the sensors to be positioned meters away from the first module.
    Type: Application
    Filed: August 3, 2021
    Publication date: February 10, 2022
    Applicant: Analog Devices, Inc.
    Inventors: Yosef STEIN, Seth S. KESSLER
  • Patent number: 11245680
    Abstract: This application describes systems and methods for using a garbled circuit and a physical unclonable function (PUF) value to authenticate a device. During enrollment, the device and at least one computer collaboratively construct multiple garbled circuits corresponding to bits of an enrollment PUF value generated by PUF circuitry coupled to the device. During authentication, the device and at least one computer evaluate the multiple garbled circuits using an authentication PUF value. Using the results of this evaluation, the at least one computer compares the enrollment PUF value with the authentication PUF value and determines a distance between them. The at least one computer may authenticate the device when the calculated distance is less than a threshold value.
    Type: Grant
    Filed: March 1, 2019
    Date of Patent: February 8, 2022
    Assignee: Analog Devices, Inc.
    Inventor: John Ross Wallrabenstein
  • Patent number: 11245366
    Abstract: Distributed amplifiers with controllable linearization are provided herein. In certain embodiments, a distributed amplifier includes a differential input transmission line, a differential output transmission line, and a plurality of differential distributed amplifier stages connected between the differential input transmission line and the differential output transmission line at different points or nodes. The distributed amplifier further includes a differential non-linearity cancellation stage connected between the differential input transmission line and the differential output transmission line and providing signal inversion relative to the differential distributed amplifier stages. The differential non-linearity cancellation stage operates with a separately controllable bias from the differential distributed amplifier stages, thereby providing a mechanism to control the linearity of the distributed amplifier.
    Type: Grant
    Filed: February 13, 2020
    Date of Patent: February 8, 2022
    Assignee: Analog Devices, Inc.
    Inventor: Jonathan Xiang Wu
  • Publication number: 20220038312
    Abstract: Devices exchange control signals with each other to ensure proper operation of an overall system. For instance, in a communication system, a baseband processor and a transceiver communicate with each other to exchange information for controlling the respective signal processing parts of the baseband processor and the transceiver. While Serial Peripheral Interfaces (SPIs) can be used, SPI can be extremely slow, and does not provide a protocol for allowing a complex set of control signals to be exchanged between the baseband processor and transceiver. The present disclosure describes a fast control interface which can support various modes of operation in allowing two devices to communicate with each other quickly and effectively.
    Type: Application
    Filed: July 14, 2021
    Publication date: February 3, 2022
    Applicant: Analog Devices, Inc.
    Inventors: Manish J. Manglani, Christopher MAYER
  • Patent number: 11240047
    Abstract: The present disclosure relates to a PUF apparatus for generating a persistent, random number. The random number is determined by selecting one or more PUF cells, each of which comprise a matched pair of capacitors that are of identical design, and determining a value that is accurately and reliably indicative of a random manufacturing difference between them, based in which the random number is generated. The random manufacturing differences between the capacitors creates the randomness in the generated random number. Furthermore, because the random manufacturing difference should be relatively stable over time, the generated random number should be persistent.
    Type: Grant
    Filed: December 16, 2019
    Date of Patent: February 1, 2022
    Assignee: Analog Devices International Unlimited Company
    Inventor: Jonathan Ephraim David Hurwitz
  • Patent number: 11238004
    Abstract: Disclosed herein are two-wire communication systems and applications thereof. In some embodiments, a slave node transceiver for low latency communication may include upstream transceiver circuitry to receive a first signal transmitted over a two-wire bus from an upstream device and to provide a second signal over the two-wire bus to the upstream device; downstream transceiver circuitry to provide a third signal downstream over the two-wire bus toward a downstream device and to receive a fourth signal over the two-wire bus from the downstream device; and clock circuitry to generate a clock signal at the slave node transceiver based on a preamble of a synchronization control frame in the first signal, wherein timing of the receipt and provision of signals over the two-wire bus by the node transceiver is based on the clock signal.
    Type: Grant
    Filed: April 27, 2020
    Date of Patent: February 1, 2022
    Assignee: Analog Devices, Inc.
    Inventors: Martin Kessler, Miguel A. Chavez, Lewis F. Lahr, William Hooper, Robert Adams, Peter Sealey
  • Patent number: 11239805
    Abstract: Isolators and methods for operating the same are described for opto-isolators with improved common mode transient immunity (CMTI). In some embodiments, a pair of photodetectors are provided in the opto-isolator and configured to generate photocurrents of opposite signs or directions in response to a light signal. Photocurrents from the pair of photodetectors are combined in a differential manner to represent data transmitted in a light signal, while common mode transient noise at the two photodetectors is attenuated or eliminated.
    Type: Grant
    Filed: October 9, 2018
    Date of Patent: February 1, 2022
    Assignee: Analog Devices, Inc.
    Inventors: Check F. Lee, Baoxing Chen
  • Patent number: 11239783
    Abstract: Systems and methods for extracting motor operational state parameters from an electric motor for improved motor control and motor fault or failure detection are discussed. An exemplary system includes an excitation circuit to apply a drive voltage to an electric motor, and a processor circuit to measure a resulting winding current, extract a current waveform by oversampling the winding current in an entire PWM frame at a sampling rate higher than the PWM frequency, and fit the current waveform in the PWM period to a parametric model. The processor circuit can determine a motor operational state parameter using one or more of the applied drive voltage or the parametric model of the winding current.
    Type: Grant
    Filed: July 2, 2020
    Date of Patent: February 1, 2022
    Assignee: Analog Devices International Unlimited Company
    Inventors: Adam James Glibbery, Javier Calpe Maravilla
  • Patent number: 11233504
    Abstract: Systems and methods for early-onset electrical fault detection are described in which a rate-of-rise of channel current in a device such as a transistor is sensed, indicating whether an electrical fault is present. In some embodiments, the rate-of-rise of the channel current may be sensed by detecting whether a current flowing away from a control terminal of the device is greater than a threshold level. In the event that an electrical fault is detected, the device may be shut off to prevent damage to the device.
    Type: Grant
    Filed: February 28, 2019
    Date of Patent: January 25, 2022
    Assignee: Analog Devices International Unlimited Company
    Inventors: Deepak Gunasekaran, Ryan Schnell, Eric Benedict, Maurice Moroney
  • Patent number: 11229373
    Abstract: A plethysmography (“PPG”) measurement system may include at least one source of PPG radiation and at least one auxiliary sensor for detection of PPG radiation. The radiation source emits a portion of the PPG radiation toward a subject and another portion along an optical path for direct communication between the PPG radiation source and the auxiliary sensor. The auxiliary sensor may develop a profile against which measurements from primary PPG sensors, which receive light returning from the subject, may be compared. From this comparison, new PPG signals may be generated that exhibit lower noise than the PPG signals output by PPG sensors. These noise mitigation techniques may be used advantageously by a PPG system to generate more accurate measurements and also to reduce power consumption by the radiation sources.
    Type: Grant
    Filed: September 29, 2014
    Date of Patent: January 25, 2022
    Assignee: ANALOG DEVICES, INC.
    Inventor: Shrenik Deliwala
  • Publication number: 20220019411
    Abstract: Described herein are techniques for providing device-specific code completion. Some embodiments provide an integrated development environment (IDE) system that automatically determines an identity of a device and provides device-specific code completion suggestions. The IDE system loads a device module associated with the identity of the device. The device module stores information indicating classes, methods, and/or properties provided by a software driver of the device. The IDE system uses the information from the device module to determine device-specific code completion suggestions to provide to a user. For example, the user may be entering software code into a text editor of the IDE system. The IDE system may provide device-specific code completion suggestions to the user in the text editor.
    Type: Application
    Filed: February 5, 2021
    Publication date: January 20, 2022
    Applicant: Analog Devices, Inc.
    Inventors: Jason Cockrell, Jeremiah E. Simonsen
  • Publication number: 20220018931
    Abstract: Delay calibration for digital signal chains of SFCW systems is disclosed. An example calibration method includes receiving a burst with a test pulse, the burst having a duration of L clock cycles; receiving a trigger indicative of a time when the burst was transmitted; generating a digital signal indicative of the received burst; for each of L clock cycles, computing a moving average of a subset of digital samples and an amplitude for each average; identifying one moving average for which the computed amplitude is closest to an expected amplitude; identifying the clock cycle of the identified moving average; and updating at least one delay to be applied in digital signal processing of received bursts based on a difference between the trigger and the identified clock cycle. The delay may be used for selecting digital samples of the received signal that contain valid data for performing further data processing.
    Type: Application
    Filed: July 16, 2020
    Publication date: January 20, 2022
    Applicant: Analog Devices International Unlimited Company
    Inventors: Vinoth KUMAR, Satishchandra G. RAO, Corey PETERSEN, Madhusudan RATHI, Gerard E. TAYLOR, Kaustubh MUNDHADA
  • Publication number: 20220021196
    Abstract: Circuits and methods for protecting against over-current conditions of switches are described. Over-current conditions can damage switches and the circuits they connect. Some embodiments of the present application provide a sense switch in parallel with the load switch. The sense switch is smaller than the load switch, and is used to sense an over-current condition of the load switch. The sense switch can remain on even when the load switch is turned off in response to detection of an over-current condition.
    Type: Application
    Filed: July 20, 2020
    Publication date: January 20, 2022
    Applicant: Analog Devices International Unlimited Company
    Inventors: Jofrey Generalao Santillan, David Aherne
  • Publication number: 20220019177
    Abstract: TDCs for converting time periods to digital values are disclosed. An example TDC includes a ring oscillator and a residue generation circuit. Each stage of the residue generation circuit is configured to operate on outputs from two different stages of the ring oscillator. The TDC further includes a counter for counting the number of times that an output of one of the stages of the ring oscillator switches between being at a first signal level and being at a second signal level during a time period that is being converted to a digital value. The TDC also includes a combiner for generating the digital value by combining a value indicative of the number of times counted by the counter and an output of the residue generation circuit. Such a TDC may have relatively low area and low power consumption compared to the conventional TDC designs, while yielding sufficiently linear behavior.
    Type: Application
    Filed: May 11, 2021
    Publication date: January 20, 2022
    Applicant: Analog Devices International Unlimited Company
    Inventors: Wreeju BHAUMIK, Batna SURYANARAYANA