Patents by Inventor Anantha Chandrakasan

Anantha Chandrakasan has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 10608780
    Abstract: Efficient and reliable transmission of information from sparse sources over wireless channels in wireless signal networks (WSNs). WSN nodes employ an “integrated signal representation-to-modulation” scheme to describe a sparse signal acquired from a sensor so as to ensure robustness against channel errors across a wide range of signal to noise (SNR) values in a rateless fashion. In one example, sparse signal samples are linearly transformed such that the total number of bits representing the sparse signal is reduced. The linearly-transformed signal samples are directly mapped to a modulation constellation to provide a succession of modulation symbols. A carrier wave is modulated in phase and/or frequency according to the succession of the modulation symbols to generate an encoded carrier wave representing the sparse analog signal. In one aspect, an order of the modulation constellation is based on the precision (e.g., number of bits) of each of the linearly-transformed signal samples.
    Type: Grant
    Filed: February 2, 2017
    Date of Patent: March 31, 2020
    Assignee: Massachusetts Institute of Technology
    Inventors: Georgios Angelopoulos, Muriel Medard, Anantha Chandrakasan
  • Publication number: 20190253396
    Abstract: Systems and methods for implementing confidential communications between nodes of a network provide reduced power consumption, require less memory, and provide improved security, relative to previously-known systems and method. Preferred embodiments implement protocol functions in hardware, as opposed to software, to yield some or all of the foregoing improvements. Some embodiments use a hashing circuit for multiple purposes, while maintaining its ability to compute successive intermediate hash values. Some embodiments improve security of systems using circuits configured to leverage a favorable data format.
    Type: Application
    Filed: February 12, 2019
    Publication date: August 15, 2019
    Inventors: Anantha Chandrakasan, Chiraag Juvekar, Utsav Banerjee
  • Patent number: 10164472
    Abstract: Wireless charging of portable electronic devices is carried out by detecting load variations caused by the device and dynamically compensating for these variations during charging to increase system efficiency and regulate delivered power. In some embodiments, load variations are tracked by comparing a feedback signal to a value range and determining whether the feedback value is higher than, lower than, or within the range of values. This information is then used to modify one or more parameters associated with a power amplifier in a transmitter device.
    Type: Grant
    Filed: November 19, 2014
    Date of Patent: December 25, 2018
    Assignee: Massachusetts Institute of Technology
    Inventors: Anantha Chandrakasan, Rui Jin
  • Publication number: 20180326212
    Abstract: The disclosure features systems for providing auditory signals to a subject. The systems include a sensor front-end circuit configured to be connected to an acoustic sensor and to convert analog signals received from the acoustic sensor to digital electric signals. The systems further include a sound processor circuit configured to be connected to the sensor front-end circuit and receive the electric signals provided by the sensor front end circuit. The sound processor includes multiple filters that spectrally decompose the received electrical signals into multiple spectral channels during operation of the system. The multiple spectral channels include at least a low frequency channel and a high frequency channel and the sound processor circuit is configured to operate the low frequency channel at a sample rate lower than a sample rate of the high frequency channel.
    Type: Application
    Filed: July 16, 2018
    Publication date: November 15, 2018
    Inventors: Marcus Yip, Anantha Chandrakasan, Konstantina Stankovic
  • Patent number: 10022542
    Abstract: In one aspect, the disclosure features systems for providing auditory signals to a subject. The systems include a sensor front-end circuit configured to be connected to an acoustic sensor and to convert analog signals received from the acoustic sensor to digital electric signals. The systems further include a sound processor circuit configured to be connected to the sensor front-end circuit and receive the electric signals provided by the sensor front end circuit. The sound processor includes multiple filters that spectrally decompose the received electrical signals into multiple spectral channels during operation of the system. The multiple spectral channels include at least a low frequency channel and a high frequency channel and the sound processor circuit is configured to operate the low frequency channel at a sample rate lower than a sample rate of the high frequency channel.
    Type: Grant
    Filed: November 25, 2014
    Date of Patent: July 17, 2018
    Assignees: Massachusetts Eye & Ear Infirmary, Massachusetts Institute of Technology
    Inventors: Marcus Yip, Anantha Chandrakasan, Konstantina Stankovic
  • Publication number: 20170222753
    Abstract: Efficient and reliable transmission of information from sparse sources over wireless channels in wireless signal networks (WSNs). WSN nodes employ an “integrated signal representation-to-modulation” scheme to describe a sparse signal acquired from a sensor so as to ensure robustness against channel errors across a wide range of signal to noise (SNR) values in a rateless fashion. In one example, sparse signal samples are linearly transformed such that the total number of bits representing the sparse signal is reduced. The linearly-transformed signal samples are directly mapped to a modulation constellation to provide a succession of modulation symbols. A carrier wave is modulated in phase and/or frequency according to the succession of the modulation symbols to generate an encoded carrier wave representing the sparse analog signal. In one aspect, an order of the modulation constellation is based on the precision (e.g., number of bits) of each of the linearly-transformed signal samples.
    Type: Application
    Filed: February 2, 2017
    Publication date: August 3, 2017
    Inventors: Georgios Angelopoulos, Muriel Medard, Anantha Chandrakasan
  • Patent number: 9608652
    Abstract: A time-interleaved (TI) analog-to-digital converter (ADC) architecture employs a low resolution coarse ADC channel that samples an input analog signal at a Nyquist rate and facilitates background calibration of timing-skew error without interrupting normal operation to sample/convert the input signal. The coarse ADC channel provides a timing reference for multiple higher resolution TI ADC channels that respectively sample the input signal at a lower sampling rate. The coarse ADC digital output is compared to respective TI ADC digital outputs to variably adjust in time corresponding sampling clocks of the TI ADC channels so as to substantially align them with the sampling clock of the coarse ADC channel, thus reducing timing-skew error. In one example, the coarse ADC output provides the most significant bits (MSBs) of the respective TI ADC digital outputs to further improve conversion speed and reduce power consumption in these channels.
    Type: Grant
    Filed: November 23, 2015
    Date of Patent: March 28, 2017
    Assignee: MASSACHUSETTS INSTITUTE OF TECHNOLOGY
    Inventors: Sunghyuk Lee, Hae-Seung Lee, Anantha Chandrakasan
  • Publication number: 20160287870
    Abstract: In one aspect, the disclosure features systems for providing auditory signals to a subject. The systems include a sensor front-end circuit configured to be connected to an acoustic sensor and to convert analog signals received from the acoustic sensor to digital electric signals. The systems further include a sound processor circuit configured to be connected to the sensor front-end circuit and receive the electric signals provided by the sensor front end circuit. The sound processor includes multiple filters that spectrally decompose the received electrical signals into multiple spectral channels during operation of the system. The multiple spectral channels include at least a low frequency channel and a high frequency channel and the sound processor circuit is configured to operate the low frequency channel at a sample rate lower than a sample rate of the high frequency channel.
    Type: Application
    Filed: November 25, 2014
    Publication date: October 6, 2016
    Inventors: Marcus Yip, Anantha Chandrakasan, Konstantina Stankovic
  • Publication number: 20160268832
    Abstract: Wireless charging of portable electronic devices is carried out by detecting load variations caused by the device and dynamically compensating for these variations during charging to increase system efficiency and regulate delivered power. In some embodiments, load variations are tracked by comparing a feedback signal to a value range and determining whether the feedback value is higher than, lower than, or within the range of values. This information is then used to modify one or more parameters associated with a power amplifier in a transmitter device.
    Type: Application
    Filed: November 19, 2014
    Publication date: September 15, 2016
    Inventors: Anantha Chandrakasan, Rui Jin
  • Patent number: 9369005
    Abstract: This disclosure describes techniques and systems for extracting energy from the endocochlear potential (EP) in animal subjects (e.g., human subjects) and using the extracted energy to operate circuits (e.g., electronic device, sensors, and transmitters). The subject matter of this disclosure is embodied, for example, in a system for extracting energy from an endocochlear potential of an animal, wherein the system includes a pair of electrodes, and a circuit coupled to the pair of electrodes. The circuit includes a boost converter, an energy buffer component configured to receive voltage from the boost converter, a start-up rectifier configured to provide voltage to the energy buffer component, and a control component configured to provide control signals to the boost converter. The power extracted from the endocochlear potential is equal or larger than the quiescent power of the circuit.
    Type: Grant
    Filed: March 3, 2014
    Date of Patent: June 14, 2016
    Assignees: Massachusetts Eye & Ear Infirmary, Massachusetts Institute of Technology
    Inventors: Konstantina Stankovic, Anantha Chandrakasan, Patrick Mercier, Saurav Bandyopadhyay, Andrew Lysaght
  • Patent number: 9313072
    Abstract: An ASIC for monitoring wideband GHz spectrum to sense respective frequency components present in the spectrum. The ASIC implements Fast Fourier Transform (FFT) techniques to facilitate identification of one or more frequency components of a sparse signal after the signal is sub-sampled at a rate below the Nyquist criterion. The ASIC computes a first Fast Fourier Transform (FFT) of a first sub-sampled set of samples of a time-varying signal representing the monitored spectrum and sampled at a first sampling rate, and further computes a second FFT of a second sub-sampled set of samples of the time-varying signal sampled at a second sampling rate different from the first sampling rate. In one example, each of the first FFT and the second FFT is a low-radix FFT to facilitate a low-power and low-cost ASIC implementation of wideband spectrum sensing.
    Type: Grant
    Filed: November 19, 2014
    Date of Patent: April 12, 2016
    Assignee: Massachussetts Institute of Technology
    Inventors: Dina Katabi, Omid Salehi-Abari, Ezzeldin Hamed, Haitham Z. Al-Hassanieh, Lixin Shi, Abhinav Agarwal, Anantha Chandrakasan, Vladimir Stojanovic
  • Publication number: 20160079994
    Abstract: A time-interleaved (TI) analog-to-digital converter (ADC) architecture employs a low resolution coarse ADC channel that samples an input analog signal at a Nyquist rate and facilitates background calibration of timing-skew error without interrupting normal operation to sample/convert the input signal. The coarse ADC channel provides a timing reference for multiple higher resolution TI ADC channels that respectively sample the input signal at a lower sampling rate. The coarse ADC digital output is compared to respective TI ADC digital outputs to variably adjust in time corresponding sampling clocks of the TI ADC channels so as to substantially align them with the sampling clock of the coarse ADC channel, thus reducing timing-skew error. In one example, the coarse ADC output provides the most significant bits (MSBs) of the respective TI ADC digital outputs to further improve conversion speed and reduce power consumption in these channels.
    Type: Application
    Filed: November 23, 2015
    Publication date: March 17, 2016
    Inventors: Sunghyuk Lee, Hae-Seung Lee, Anantha Chandrakasan
  • Publication number: 20150146826
    Abstract: An ASIC for monitoring wideband GHz spectrum to sense respective frequency components present in the spectrum. The ASIC implements Fast Fourier Transform (FFT) techniques to facilitate identification of one or more frequency components of a sparse signal after the signal is sub-sampled at a rate below the Nyquist criterion. The ASIC computes a first Fast Fourier Transform (FFT) of a first sub-sampled set of samples of a time-varying signal representing the monitored spectrum and sampled at a first sampling rate, and further computes a second FFT of a second sub-sampled set of samples of the time-varying signal sampled at a second sampling rate different from the first sampling rate. In one example, each of the first FFT and the second FFT is a low-radix FFT to facilitate a low-power and low-cost ASIC implementation of wideband spectrum sensing.
    Type: Application
    Filed: November 19, 2014
    Publication date: May 28, 2015
    Inventors: Dina Katabi, Omid Salehi-Abari, Ezzeldin Hamed, Haitham Z. Al-Hassanieh, Lixin Shi, Abhinav Agarwal, Anantha Chandrakasan, Vladimir Stojanovic
  • Publication number: 20140247020
    Abstract: This disclosure describes techniques and systems for extracting energy from the endocochlear potential (EP) in animal subjects (e.g., human subjects) and using the extracted energy to operate circuits (e.g., electronic device, sensors, and transmitters). The subject matter of this disclosure is embodied, for example, in a system for extracting energy from an endocochlear potential of an animal, wherein the system includes a pair of electrodes, and a circuit coupled to the pair of electrodes. The circuit includes a boost converter, an energy buffer component configured to receive voltage from the boost converter, a start-up rectifier configured to provide voltage to the energy buffer component, and a control component configured to provide control signals to the boost converter. The power extracted from the endocochlear potential is equal or larger than the quiescent power of the circuit.
    Type: Application
    Filed: March 3, 2014
    Publication date: September 4, 2014
    Applicants: Massachusetts Institute of Technology, Massachusetts Eye & Ear Infirmary
    Inventors: Konstantina Stankovic, Anantha Chandrakasan, Patrick Mercier, Saurav Bandyopadhyay, Andrew Lysaght
  • Patent number: 8305050
    Abstract: An energy harvesting system is provided that includes a startup module for starting the energy harvesting system operation from a completely OFF state. The startup module uses mechanical vibrations due to motion to trigger a switch which permits the startup module to charge one or more first capacitive elements so to as reach a first defined voltage. A storage module buffers energy obtained from a thermoelectric harvester to be used by a load device. The storage module commences storing energy from the thermoelectric harvester when the first defined voltage has been reached allowing charging of one or more second capacitive elements to reach a second defined voltage. A DC-DC converter module provides regulated voltage to the load device after energy has been transferred from the thermoelectric harvester. The DC-DC converter module determines whether the second defined voltage has been reached and releases stored energy in the one or more first capacitive elements and the load device.
    Type: Grant
    Filed: October 12, 2009
    Date of Patent: November 6, 2012
    Assignee: Massachusetts Institute of Technology
    Inventors: Yogesh Ramadass, Anantha Chandrakasan
  • Publication number: 20100270996
    Abstract: An energy harvesting system is provided that includes a startup module for starting the energy harvesting system operation from a completely OFF state. The startup module uses mechanical vibrations due to motion to trigger a switch which permits the startup module to charge one or more first capacitive elements so to as reach a first defined voltage. A storage module buffers energy obtained from a thermoelectric harvester to be used by a load device. The storage module commences storing energy from the thermoelectric harvester when the first defined voltage has been reached allowing charging of one or more second capacitive elements to reach a second defined voltage. A DC-DC converter module provides regulated voltage to the load device after energy has been transferred from the thermoelectric harvester. The DC-DC converter module determines whether the second defined voltage has been reached and releases stored energy in the one or more first capacitive elements and the load device.
    Type: Application
    Filed: October 12, 2009
    Publication date: October 28, 2010
    Inventors: Yogesh Ramadas, Anantha Chandrakasan
  • Publication number: 20100079034
    Abstract: An energy harvester circuit is provided. The energy harvester circuit includes a harvesting module for extracting energy from an ambient source. A bias flip module manages the manner in which voltage across the harvesting module transitions when input current from the harvesting module changes direction so as to allow a majority of the charge available from the harvesting module to be extracted. A voltage transitioning module is shared amongst one or more DC-DC converters for efficient energy management.
    Type: Application
    Filed: September 14, 2009
    Publication date: April 1, 2010
    Inventors: Yogesh Ramadass, Anantha Chandrakasan
  • Patent number: 7571359
    Abstract: Multiple clock circuits are connected by phase detector circuits to generate and synchronize local clock signals. For example, a clock distribution circuit includes a first clock circuit that is configured to generate a first clock signal in response to a first error signal, and a second clock circuit that is configured to generate a second clock signal in response to the first error signal. A first phase detector circuit connects the first clock circuit to the second clock circuit and is configured to generate the first error signal in response to the first and the second clock signals.
    Type: Grant
    Filed: July 31, 2001
    Date of Patent: August 4, 2009
    Assignee: Massachusetts Institute of Technology
    Inventors: Vadim Gutnik, Anantha Chandrakasan
  • Patent number: 7480879
    Abstract: System and method for analyzing substrate noise is disclosed, which is capable of accepting inputs of increasing complexity and granularity. During the early phases, the tool can accept coarse circuit descriptions, such as gate level netlists. The tool is capable of generating rudimentary substrate models based on estimated die size, allowing the designer to have an early indication of potential substrate noise issues. During the middle phases, the tool can accept more accurate circuit descriptions, such as a SPICE netlist. A more detailed substrate model can be generated, which considers layout information, thereby allowing the designer to make layout and circuit modifications before the circuit is completed. Lastly, during final verification, the tool can accept an even more accurate netlist, such as a SPICE netlist that includes parasitic capacitance. The tool can also accept a more detailed substrate model and provides the substrate noise analysis necessary to finalize the design.
    Type: Grant
    Filed: April 7, 2006
    Date of Patent: January 20, 2009
    Assignee: Massachusetts Institute of Technology
    Inventors: Nisha Checka, Anantha Chandrakasan, Rafael Reif
  • Patent number: 7400276
    Abstract: A mechanism for use with a bus provided from parallel, capacitively-coupled bus lines to restrict a number of possible transitions on the bus to a number that is smaller than the maximum number of possible transitions so that data transmissions on the bus occur at a transmission rate which is higher than the transmission rate allowable if the number of transitions had not been restricted.
    Type: Grant
    Filed: January 27, 2003
    Date of Patent: July 15, 2008
    Assignee: Massachusetts Institute of Technology
    Inventors: Paul P. Sotiriadis, Anantha Chandrakasan