Patents Assigned to Analog Devices Global
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Patent number: 10101414Abstract: Thin film resistive sensors typically include a number of resistive components. These components should be well matched in order for the sensor to provide accurate readings. When a sensor is incorporated within an integrated circuit, the resistive components may be formed over, or under, metallic traces that form part of other components. As a result, the thin film resistive components are subjected to different levels of stress. This disclosure provides a structure that is arranged to mitigate the effects of stress.Type: GrantFiled: January 18, 2016Date of Patent: October 16, 2018Assignee: Analog Devices GlobalInventors: Jan Kubik, Seamus P. Whiston, Padraig Michael Doran
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Patent number: 10103744Abstract: A delta sigma modulator circuit comprises a forward circuit path including a first integrator stage and an analog-to-digital converter (ADC) circuit, wherein a transfer function of the forward circuit path includes a signal gain element of m, wherein m is a positive integer; an input path to the first integrator stage, wherein a transfer function of the input path includes a signal gain element of l/m; and a feedback circuit path operatively coupled to an output of the ADC circuit and an inverting input of an op amp of the first integrator stage, wherein the feedback circuit path includes at least a first digital-to-analog converter (DAC) circuit and a transfer function of the feedback circuit path includes a signal gain element of l/m.Type: GrantFiled: April 12, 2017Date of Patent: October 16, 2018Assignee: Analog Devices GlobalInventors: Avinash Gutta, Venkata Aruna Srikanth Nittala, Abhilasha Kawle
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Patent number: 10103712Abstract: The present disclosure provides a voltage variable attenuator (VVA) with a controllable matching network. The output of the attenuation portion of the VVA is couple to a matching network. The matching network includes a resistive element, which may be a Field Effect Transistor (FET), whose resistance may be controlled as a function of attenuation. In particular, a control voltage used to control the resistance of the attenuation portion of the VVA is also used to control the resistive element of the matching network. In this manner, the output impedance of the VVA may be maintained at a desired level.Type: GrantFiled: December 15, 2016Date of Patent: October 16, 2018Assignee: Analog Devices GlobalInventors: Ahmed Mohammad Ashry Othman, Mohamed Moussa Ramadan Esmael
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Patent number: 10097200Abstract: A device having a sample-rate converter that may be programmed to generate samples at different rates is synchronized to an external synchronization pulse by temporarily changing the sample rate to a temporary sample rate and then changing the sample rate back to the original sample rate. Synchronization in a reduced amount of time is achieved by determining the interval between the synchronization pulse and one of the output samples and determining a processing time of the device for generating the output samples at a new rate. The system calculates a temporary sample rate based on these calculations that tends to reduce an amount of time to achieve synchronization.Type: GrantFiled: May 12, 2017Date of Patent: October 9, 2018Assignee: Analog Devices GlobalInventors: Miguel Usach Merino, Michael Hennessy, Anthony Evan O'Shaughnessy, Claire Croke
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Patent number: 10090940Abstract: A method for calibrating an antenna array coupled to a plurality of transmitters via a plurality of couplers and a plurality of antenna element feeds is described.Type: GrantFiled: August 15, 2014Date of Patent: October 2, 2018Assignee: Analog Devices GlobalInventors: Conor O'Keeffe, Michael O'Brien, Sean Sexton
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Publication number: 20180275280Abstract: A system and method for operating a high dynamic range analog front-end receiver for long range LIDAR with a transimpedance amplifier (TIA) include a clipping circuit to prevent saturation of the TIA. The output of the clipping circuit is connected via a diode or transistor to the input of the TIA and regulated such that the input voltage of the TIA remains close to or is only slightly above the saturation threshold voltage of the TIA. The regulation of the input voltage of the TIA can be improved by connecting a limiting resistor in series with the diode or transistor. A second clipping circuit capable of dissipating higher input currents and thus higher voltages may be connected in parallel with the first clipping circuit. A resistive element may be placed between the first and second clipping circuits to further limit the input current to the TIA.Type: ApplicationFiled: September 7, 2017Publication date: September 27, 2018Applicant: Analog Devices GlobalInventors: Yalcin Alper EKEN, Alp OGUZ
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Publication number: 20180276157Abstract: SPI frame for simultaneously entering 8 bit daisy-chain mode from 16 bit register addressable mode. Some products that implement SPI may be connected in a daisy chain configuration, the first slave output being connected to the second slave input, etc. The SPI port of each slave is designed to send out during the second group of clock pulses an exact copy of the data it received during the first group of clock pulses. The whole chain acts as a communication shift register; daisy chaining is often done with shift registers to provide a bank of inputs or outputs through SPI. Large latency occurs during the entry into daisy-chain mode which increases as a function of the number of linked SPI devices. A means for simultaneously instructing all connected devices to enter/enable daisy-chain mode is disclosed.Type: ApplicationFiled: March 24, 2017Publication date: September 27, 2018Applicant: Analog Devices GlobalInventors: Wes Vernon LOFAMIA, Jofrey Santillan, David Aherne
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Patent number: 10075179Abstract: A multiple impedance string, multiple output digital-to-analog converter (DAC) circuit that can include a shared coarse resolution DAC, two first fine resolution DACs to receive outputs of the MSB DAC, and a multiplexer to multiplex outputs of the first and second fine resolution DACs to output terminals. The multiplexer can be configured to interchange coupling of the outputs of the first and second fine resolution DACs using one or more MSBs.Type: GrantFiled: August 3, 2017Date of Patent: September 11, 2018Assignee: Analog Devices GlobalInventors: Michael D. Keane, Johan H. Mansson, Dennis A. Dempsey
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Patent number: 10067171Abstract: An active antenna test system comprising an active antenna unit comprising: a test signal generator arranged to generate at least a first test signal and at least one second test signal; a plurality of transmitter modules operably coupled to the test signal generator wherein the plurality of transmitter modules are arranged to simultaneously process the first test signal and at least one second test signal to produce at least one radio frequency test signal therefrom; and at least one receiver module arranged to process one or more signals falling in at least one spectral band determined to be susceptible to intermodulation distortion products caused by the at least one radio frequency test signal being generated from the first test signal and at least one second test signal; and an intermodulation determination module operably coupled to the at least one receiver module and arranged to determine a first received intermodulation performance.Type: GrantFiled: April 8, 2015Date of Patent: September 4, 2018Assignee: Analog Devices GlobalInventors: Conor O'Keeffe, Joe Moore
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Patent number: 10069531Abstract: An Ethernet or other communications module can amplify and reinforce a signal received from a non-local source without requiring a transformer or other magnetic component. A semiconductor integrated difference amplifier circuit can be used to amplify and reinforce a differential mode component of the received signal, while also attenuating a common mode component of the received signal. A transmission compensation network can generate a phase-shifted version of a locally transmitted signal being placed on the same communication terminals as the received signal during full duplex communications, for cancellation of such locally transmitted signal at inputs of a local receiver circuit. This can enhance detection of the received signal generated by the non-local source.Type: GrantFiled: October 10, 2016Date of Patent: September 4, 2018Assignee: Analog Devices GlobalInventors: Andreas Koch, Ralph Patrick McCormick
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Patent number: 10063199Abstract: Provided herein are amplifiers, such as buffers, with increased headroom. An amplifier stage includes a follower transistor and current source configured to receive a power supply voltage comprising an alternating current component and a direct current component. The alternating current component of the power supply voltage has substantially the same frequency and magnitude as the input signal received by the follower transistor. In radio frequency (RF) and intermediate frequency (IF) buffer applications, for example, the increased headroom can allow for linear buffering of an input signals with increased amplitude so that the output power one decibel (OP1dB) compression point can be increased.Type: GrantFiled: June 9, 2016Date of Patent: August 28, 2018Assignee: Analog Devices GlobalInventor: Sean T. Morley
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Patent number: 10063265Abstract: A digital pre-distortion system can inversely model a power amplifier of a system to linearize the transmitter. A complex baseband model for digital pre-distortion based on a narrowband signal assumption is unworkable for an ultra wide band Cable television application. Predistortion can use a true wide band model including real-valued basis terms, obtained from a real-valued signal. When raised to a power, both even and odd harmonics or both odd or even other non-linear terms are represented and negative frequency fold-over can be accounted for. A Hilbert transform can be applied. Compressed sensing can be used to reduce the number of basis terms in the true real wide band model to generate a sparse model. Sparse equalization can be added to improve the stability of the digital pre-distortion system.Type: GrantFiled: October 12, 2016Date of Patent: August 28, 2018Assignee: Analog Devices GlobalInventors: Patrick Pratt, Claire Masterson, Justine Mary McCormack
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Patent number: 10056849Abstract: An impedance matching circuit is provided for use with a piezotransducer that includes a parasitic capacitor comprising: an inductor coupled in parallel with the parasitic capacitor; a peak and valley detection circuit configured to detect output voltage waveform peaks and valleys; a first switch circuit configured to bias flip the output voltage waveform at a selectable first time relative to a detected peak and at a selectable first time relative to a detected valley; a second switch circuit configured to couple the inductor to the energy storage circuit at a selectable second time following each output voltage bias flip; an energy monitoring circuit to provide an indication of energy flow from the inductor to the energy storage circuit following each output voltage bias flip; and a maximum power point tracking (MPPT) circuit configured to select the first time and the second time based at least in part upon the indicated energy flow.Type: GrantFiled: February 16, 2015Date of Patent: August 21, 2018Assignee: Analog Devices GlobalInventors: Xing Li, Yong Feng, Bin Shao
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Patent number: 10044327Abstract: A capacitive gain amplifier circuit includes two sets of Miller capacitors and two output stage differential amplifier circuits. A first set of Miller capacitors is used to compensate the first output stage differential amplifier circuit during a first phase that resets the first output stage differential amplifier circuit. The second set of Miller capacitors is used to compensate the first output stage differential amplifier circuit during a second phase that chops a signal being amplified. The second set of Miller capacitors is swapped from one polarity to an opposite polarity of the first output stage differential amplifier circuit during successive second phases. The second output stage differential amplifier circuit includes a set of inputs selectively coupled with the inputs of the first output stage differential amplifier circuit and a set of outputs selectively coupled with the outputs of the first output stage differential amplifier circuit during the second phase.Type: GrantFiled: May 19, 2017Date of Patent: August 7, 2018Assignee: Analog Devices GlobalInventors: Hanqing Wang, Gerard Mora-Puchalt
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Patent number: 10039020Abstract: A single complex calculation for locating a dominant frequency, such as an interfering signal in a frequency range, is replaced by several much easier ones. A signal is analyzed over a first frequency range to locate at least one comparatively significant frequency component therein. This can involve analyzing, using electronic hardware, a test range of frequencies to identify a potentially significant component within the test range; and determining, using electronic hardware, if a condition for finishing the analysis has been met. If the condition has not been met, the test range is modified as a result of the analysis and the operations of analyzing and determining are repeated.Type: GrantFiled: October 17, 2014Date of Patent: July 31, 2018Assignee: Analog Devices GlobalInventor: Patrick Joseph Pratt
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Patent number: 10033413Abstract: Various examples are directed to systems and methods for digital predistortion (DPD). A linear digital predistortion (DPD) circuit may be programmed to generate a pre-distorted signal linear component based at least in part on a complex baseband signal. A nonlinear DPD circuit may be programmed to generate a pre-distorted signal nonlinear component based at least in part on the complex baseband signal. A mixer circuit programmed to generate a pre-distorted signal based at least in part on the pre-distorted signal linear component and the pre-distorted signal nonlinear component.Type: GrantFiled: May 19, 2016Date of Patent: July 24, 2018Assignee: Analog Devices GlobalInventor: Patrick Pratt
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Patent number: 10033304Abstract: An electronic circuit can be coupled to an energy harvesting device. The output of the energy harvesting device can provide a damped oscillating waveform elicited from a transient stimulus applied to the energy harvesting device, such as in response to mechanical shock or mechanical impact excitation. A first switch can be coupled between the energy harvesting device and an inductor and configured to selectively connect the input node to the inductor. A second switch can be coupled between the inductor and an energy storage device, the second switch configured to selectively couple the inductor to the energy storage device. A control circuit can be coupled to the first and second switches, such as configured to operate the first and second switches according to one or more of an over bias flip technique, a half bias flip technique, or a bias flip technique.Type: GrantFiled: December 17, 2015Date of Patent: July 24, 2018Assignee: Analog Devices GlobalInventors: Yong Feng, Xing Li, Bin Shao
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Patent number: 10033179Abstract: A method of and apparatus for protecting a MEMS switch is provided. The method and apparatus improve the integrity of MEMS switches by reducing their vulnerability to current flow through them during switching of the MEMS switch between on and off or vice versa. The protection circuit provides for a parallel path, known as a shunt, around the MEMS component. However, components within the shunt circuit can themselves be removed from the shunt when they are not required. This improves the electrical performance of the shunt when the switch is supposed to be in an off state.Type: GrantFiled: June 18, 2015Date of Patent: July 24, 2018Assignee: Analog Devices Global Unlimited CompanyInventors: Padraig L. Fitzgerald, Eric James Carty
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Publication number: 20180205319Abstract: Isolated DC-DC converters are described. A DC-DC converter is a device which converts a direct current (DC) signal from one voltage to another. An isolated DC-DC converter performs the conversion across an electrical isolation barrier separating two voltage domains. The signal converted from one voltage to another, and transferred from one voltage domain to another, may be a power signal. Described are isolated DC-DC converters which transfer a power signal from one voltage domain to another via an isolator, and a power feedback signal back across the isolator. The isolator is a transformer in some situations.Type: ApplicationFiled: January 13, 2017Publication date: July 19, 2018Applicant: Analog Devices GlobalInventors: Yue Zhuo, Baoxing Chen, Xin Yang, Tianting Zhao
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Patent number: 10020068Abstract: Distortion in a combined sample and hold circuit and multiplexer can be reduced by dividing the sample and hold circuit and the multiplexer up into main and compensation signal channels, and considering the total error signal that arises during an acquire phase across both the switches of the multiplexer and the input switches of the sample and hold stage as a single error signal that has to be compensated. This compensation is then achieved by causing the same error voltages to be induced in both the main and compensation channels of the whole MUX and sample and hold circuit, such that errors can be made to cancel, thus improving the performance of the stage.Type: GrantFiled: September 15, 2016Date of Patent: July 10, 2018Assignee: Analog Devices GlobalInventors: Christopher Peter Hurrell, Rares Andrei Bodnar, Pasquale Delizia