Patents by Inventor Arun Natarajan

Arun Natarajan 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: 11394115
    Abstract: Methods and apparatus for calibrating signal processing chains using cross coupling between polarizations are described. Various exemplary methods and apparatus, in accordance with the present invention, are well suited for use in communications devices using beamforming and including arrays of TX/RX front ends, e.g., a first plurality of horizontal polarization front ends and a second plurality of vertical polarization front ends.
    Type: Grant
    Filed: December 10, 2020
    Date of Patent: July 19, 2022
    Assignee: Mixcomm, Inc.
    Inventors: Frank Lane, Arun Natarajan, Aristotele Hadjichristos, Harish Krishnaswamy
  • Publication number: 20220135389
    Abstract: The present application thus provides a beverage dispensing system for combining a micro-ingredient and a diluent. The beverage dispensing system may include a nozzle and a remote micro-ingredient storage system positioned at a distance from the nozzle. The remote micro-ingredient storage system may include a recirculation loop in communication with the nozzle to agitate the micro-ingredient therein.
    Type: Application
    Filed: February 19, 2020
    Publication date: May 5, 2022
    Inventor: Arun NATARAJAN
  • Patent number: 11322839
    Abstract: A controllable reflection type phase shifter that includes an adjustable hybrid coupler and controllable adjustable reflection load circuit is described and used in some embodiments to implemented a communication system. In some embodiments the communication system supports beam forming through the use of a plurality of TX/RX signal processing chains (SPCs), each SPC including at least one reflection type phase shifter, e.g., a controllable reflection type phase shifter. The controllable reflection type phase shifters in different SPCs of the array are configured, e.g., differently, based on the particular beam pattern being used to transmit or receive signals at a given time. Control information, e.g., control values, are stored in memory with the control values corresponding to an antenna pattern to be used at a given time being retrieved from memory and to control the circuits, e.g., controllable reflection type phase shifters, in the system.
    Type: Grant
    Filed: May 30, 2020
    Date of Patent: May 3, 2022
    Assignee: Mixcomm, Inc.
    Inventors: Mahmood Baraani Dastjerdi, Arun Natarajan, Harish Krishnaswamy
  • Publication number: 20220131277
    Abstract: Methods and apparatus for implementing an arrangement of antennas in an apparatus are described. The combining of antennas and related components using Ball Grid Array (BGA) technology and various spacing/heat routing techniques allows for a group of antennas and related ICs to be implemented as a printed circuit board mountable package. Multiple antenna packages can be mounted on a printed circuit board to allow for different numbers of antennas to be included in a device depending on communications needs. The antenna package is well suited for mm-wave applications.
    Type: Application
    Filed: October 27, 2021
    Publication date: April 28, 2022
    Inventors: Syed Rahman, Arun Natarajan, Harish Krishnaswamy
  • Publication number: 20220131253
    Abstract: Methods and apparatus for implementing a circuit capable of operating as a passive power divider or combiner are described. In at least some embodiments multiple modes of operation are supported with one of the modes being a mode in which power is not communicated along one of the paths in the circuit, e.g., because the path leads to an inactive component or element. The methods and apparatus are well suited for use in communications devices and/or transceiver circuits. The passive nature of the power combiner/divider allows the device in some embodiments to act as a power divider when signals pass through the circuit in a first direction, e.g., during a transmit mode of operation, and to act as a power combiner when signals pass through the circuit in the other direction, e.g., during a receive mode of operation.
    Type: Application
    Filed: October 25, 2021
    Publication date: April 28, 2022
    Inventors: Arun Natarajan, Harish Krishnaswamy
  • Publication number: 20220131726
    Abstract: Methods and apparatus for implementing passive wideband phase shifters are described. The phase shifters exhibit good linearity over a wide range of frequencies. Furthermore at least some features are directed to allowing the phase shifters to be implemented in some embodiments in a relatively compact manner making such embodiments well suited for supporting arrays and/or other implementations where a large number of phase shifters are to be implemented in a relatively small chip area.
    Type: Application
    Filed: October 25, 2021
    Publication date: April 28, 2022
    Inventors: Kang Ning, Harish Krishnaswamy, Arun Natarajan
  • Publication number: 20220131530
    Abstract: Methods and apparatus for implementing a phase shifter in a space, e.g., chip surface area, efficient manner is described. In various embodiments a combination of switches, capacitors and a transformer are used in combination as a controllable phase shifter. In some embodiments the phase shifter supports a phase shift of 0 degrees or 180 degrees depending on the position of one or more switches. The mutual inductance of the transformer in at least some embodiments emulates one or more capacitors in a phase shift network making for an implementation that can be implemented on a semiconductor in an area efficient manner as compared to implementations using more capacitors and independent inductors.
    Type: Application
    Filed: October 25, 2021
    Publication date: April 28, 2022
    Inventors: Manoj Johnson, Arun Natarajan, Harish Krishnaswamy
  • Patent number: 11271628
    Abstract: A communications apparatus which supports beamforming is described. The communications apparatus includes an array of N beam forming circuits, each of the N beamforming circuits including an RF signal input coupled to a phase shifter, an attenuator and a power amplifier. The communications apparatus further includes an array of antenna elements, each one of the N beamforming circuits including an output coupled to a different one of the antenna elements in the array of antenna elements; and a set of beam tables including control values used to selectively control elements of the beamforming circuits. The beam tables include sets of control values which are accessed and used to control components of the beamforming circuits depending on the beam angle to be used during a given time period. A feedback circuit generate EVM control information based on output signals from the beam forming circuits.
    Type: Grant
    Filed: December 9, 2020
    Date of Patent: March 8, 2022
    Assignee: Mixcomm, Inc.
    Inventors: Aristotele Hadjichirstos, Harish Krishnaswamy, Arun Natarajan, Frank Lane
  • Publication number: 20220021430
    Abstract: A communications apparatus which supports beamforming is described. The communications apparatus includes an array of N beam forming circuits, each of the N beamforming circuits including an RF signal input coupled to a phase shifter, an attenuator and a power amplifier. The communications apparatus further includes an array of antenna elements, each one of the N beamforming circuits including an output coupled to a different one of the antenna elements in the array of antenna elements; and a set of beam tables including control values used to selectively control elements of the beamforming circuits. The beam tables include sets of control values which are accessed and used to control components of the beamforming circuits depending on the beam angle to be used during a given time period. A feedback circuit generate EVM control information based on output signals from the beam forming circuits.
    Type: Application
    Filed: December 9, 2020
    Publication date: January 20, 2022
    Inventors: Aristotele Hadjichirstos, Harish Krishnaswamy, Arun Natarajan, Frank Lane
  • Publication number: 20210399417
    Abstract: Methods and apparatus for calibrating signal processing chains using cross coupling between polarizations are described. Various exemplary methods and apparatus, in accordance with the present invention, are well suited for use in communications devices using beamforming and including arrays of TX/RX front ends, e.g., a first plurality of horizontal polarization front ends and a second plurality of vertical polarization front ends.
    Type: Application
    Filed: December 10, 2020
    Publication date: December 23, 2021
    Inventors: Frank Lane, Arun Natarajan, Aristotele Hadjichristos, Harish Krishnaswamy
  • Publication number: 20210376465
    Abstract: A controllable reflection type phase shifter that includes an adjustable hybrid coupler and controllable adjustable reflection load circuit is described and used in some embodiments to implemented a communication system. In some embodiments the communication system supports beam forming through the use of a plurality of TX/RX signal processing chains (SPCs), each SPC including at least one reflection type phase shifter, e.g., a controllable reflection type phase shifter. The controllable reflection type phase shifters in different SPCs of the array are configured, e.g., differently, based on the particular beam pattern being used to transmit or receive signals at a given time. Control information, e.g., control values, are stored in memory with the control values corresponding to an antenna pattern to be used at a given time being retrieved from memory and to control the circuits, e.g., controllable reflection type phase shifters, in the system.
    Type: Application
    Filed: May 30, 2020
    Publication date: December 2, 2021
    Inventors: Mahmood Baraani Dastjerdi, Arun Natarajan, Harish Krishnaswamy
  • Patent number: 11171613
    Abstract: Controllable radio frequency power amplifiers (RFPAs), e.g., in a Hybrid-MIMO array, which are being driven at lower power levels, are operated at conditions such that their inherent EVM and ACLR are intentionally further increased. This increase of inherent EVM and ACLR is done in a precise manner, and the increased inherent EVM and ACLR are cancelled or reduced by the EVM and ACLR of the input Array DPD signal. The net result is improved EVM and ACLR performance over a broader range of angles. Exemplary methods and apparatus for increasing distortion include individual or combinations of: i) changing the DC bias a RFPA based on average operating power level; ii) changing supply voltage, e.g. Vcc, of a RFPA based on average operating power level, iii) adding a controllable non-linear element, such as a diode or varactor, at the input of the RFPA, based on the average operating power.
    Type: Grant
    Filed: June 30, 2020
    Date of Patent: November 9, 2021
    Assignee: Mixcomm, Inc.
    Inventors: Harish Krishnaswamy, Frank Lane, Arun Natarajan, Aristotele Hadjichristos, Vikas Vinayak
  • Patent number: 10938716
    Abstract: Systems and techniques are described for ensuring that policies are consistently applied to traffic across an overlay network. An application identifier associated with a forward traffic flow and a corresponding reverse traffic flow can be determined by a device that routes packets of both the forward traffic flow and the corresponding reverse traffic flow. Next, an overlay header can be added to each packet in the forward traffic flow and to each packet in the corresponding reverse traffic flow, wherein the overlay header comprises the application identifier, a policy identifier, and a policy action. Each device in the overlay network can then apply the policy action specified in the overlay header of each packet that it routes.
    Type: Grant
    Filed: November 29, 2018
    Date of Patent: March 2, 2021
    Assignee: Riverbed Technology, Inc.
    Inventors: Bill Y. Chin, Arun Natarajan, Arthur L. Jones
  • Patent number: 10797760
    Abstract: An apparatus for simultaneous transmit and receive is provided. The apparatus is capable of rejecting or passing transmitter and receiver signals. The apparatus includes: a transmitter; an antenna (e.g., a shared antenna); a receiver including switches controllable by time varying signals; and a quadrature coupler including first, second, third, and fourth ports, wherein the first port is coupled to the transmitter, wherein the second port is coupled to the antenna, and wherein the third and fourth ports are coupled to the receiver.
    Type: Grant
    Filed: April 18, 2018
    Date of Patent: October 6, 2020
    Assignee: Oregon State University
    Inventors: Arun Natarajan, Abhishek Agrawal, Sanket Jain, Robin Garg
  • Publication number: 20190319681
    Abstract: An apparatus for simultaneous transmit and receive is provided. The apparatus is capable of rejecting or passing transmitter and receiver signals. The apparatus includes: a transmitter; an antenna (e.g., a shared antenna); a receiver including switches controllable by time varying signals; and a quadrature coupler including first, second, third, and fourth ports, wherein the first port is coupled to the transmitter, wherein the second port is coupled to the antenna, and wherein the third and fourth ports are coupled to the receiver.
    Type: Application
    Filed: April 18, 2018
    Publication date: October 17, 2019
    Applicant: Oregon State University
    Inventors: Arun NATARAJAN, Abhishek AGRAWAL, Sanket JAIN, Robin GARG
  • Patent number: 9231549
    Abstract: A phase shifter and related load device are provided. The phase shifter includes a phase shifter core and load devices. The phase shifter core has an input port for receiving an input signal, an output port for outputting an output signal, and connection ports. The load devices are coupled to the connection ports, respectively. At least one of the load devices includes first varactor units each having a first node and a second node, where first nodes of the first varactor units are coupled to a first voltage, second nodes of the first varactor units are respectively coupled to a plurality of second voltages, and the second voltages include at least two voltages different from each other. The phase shifter and related load device are capable of mitigating effects resulted from varactor's non-linear C-V curve.
    Type: Grant
    Filed: August 10, 2009
    Date of Patent: January 5, 2016
    Assignees: MEDIATEK INC., International Business Machines Corporation
    Inventors: Ming-Da Tsai, Jing-Hong Conan Zhan, Arun Natarajan
  • Patent number: 9030354
    Abstract: A method and structure for a phased-array system. An orthogonal signal generator generates a plurality of signals C(i) that are orthogonal or near-orthogonal, meaning that a cross correlation between any two signals C(i) is lower than autocorrelation, and there is a plurality of phased-array antenna elements, each said antenna element providing a signal Sinp(i). A multiplier multiplies each signal C(i) with the signal Sinp(i) of a corresponding one of the plurality of phased array antenna elements.
    Type: Grant
    Filed: March 12, 2012
    Date of Patent: May 12, 2015
    Assignee: International Business Machines Corporation
    Inventors: Arun Natarajan, Scott Reynolds
  • Patent number: 8629701
    Abstract: A method and system for compensating for offsets when measuring parameters of a phase-locked loop (PLL). In one embodiment, a proportional path in the PLL is temporarily shut off, a measurement is made of a real time-to-zero crossing in the PLL to measure a defined parameter of the PLL, the proportional path is switched on, and the defined loop parameter is adjusted based on this measurement. In one embodiment, the real time-to-zero crossing is measured after introducing a phase step into the PLL between a reference signal and an output signal of the PLL. In an embodiment, two phase steps, having opposite polarities, are successively introduced into the PLL, and the time-to-crossing measurements resulting from these two phase steps may be averaged, and this average is used to determine a loop parameter.
    Type: Grant
    Filed: July 22, 2013
    Date of Patent: January 14, 2014
    Assignee: International Business Machines Corporation
    Inventors: Mark A. Ferriss, Arun Natarajan, Benjamin Parker, Alexander Rylyakov, Jose A. Tierno, Soner Yaldiz
  • Patent number: 8606454
    Abstract: A control system and method is provided for synchronized control of a harvester and transport vehicle during unload on the go operation. The control system can maintain a desired lateral distance between the harvester and transport vehicle using swath information that is used to steer the harvester. In addition, the control system can also bring a transport vehicle into appropriate alignment with the harvester using the same swath information.
    Type: Grant
    Filed: June 29, 2011
    Date of Patent: December 10, 2013
    Assignee: CNH America LLC
    Inventors: Guoping Wang, Todd Aznavorian, Arun Natarajan, Kousha Moaveni Nejad
  • Publication number: 20130307588
    Abstract: A method and system for compensating for offsets when measuring parameters of a phase-locked loop (PLL). In one embodiment, a proportional path in the PLL is temporarily shut off, a measurement is made of a real time-to-zero crossing in the PLL to measure a defined parameter of the PLL, the proportional path is switched on, and the defined loop parameter is adjusted based on this measurement. In one embodiment, the real time-to-zero crossing is measured after introducing a phase step into the PLL between a reference signal and an output signal of the PLL. In an embodiment, two phase steps, having opposite polarities, are successively introduced into the PLL, and the time-to-crossing measurements resulting from these two phase steps may be averaged, and this average is used to determine a loop parameter.
    Type: Application
    Filed: July 22, 2013
    Publication date: November 21, 2013
    Applicant: International Business Machines Corporation
    Inventors: Mark A. Ferriss, Arun Natarajan, Benjamin Parker, Alexander Rylyakov, Jose A. Tierno, Soner Yaldiz