Patents by Inventor Alberto Valdes Garcia

Alberto Valdes Garcia 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).

  • Dynamic phased array tapering without phase recalibration
    Patent number: 10298190
    Abstract: A method for phased array tapering includes setting a gain at a phase-invariant variable gain amplifier in each of a plurality of front-ends of a phased array transceiver to perform tapering of beam pattern side lobes. A resistance in the phase-invariant variable gain amplifier is set to provide a phase shift that is independent of gain.
    Type: Grant
    Filed: September 28, 2016
    Date of Patent: May 21, 2019
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: John F. Bulzacchelli, Bodhisatwa Sadhu, Alberto Valdes Garcia
  • Direct RF demodulation
    Patent number: 10284402
    Abstract: An apparatus for decoding a data modulated signal includes a signal receiver that receives a data modulated signal that is encoded with phase-shift keying (PSK) and provides an amplified signal corresponding to the data modulated signal, a tunable phase shifter that receives a local reference signal and a selected phase shift, applies the selected phase shift to the local reference signal to produce a phase shifted reference signal, a summing unit that sums the amplified signal and the phase shifted reference signal to produce a summed signal, an amplitude detector that determines an amplitude of the summed signal, and a symbol detector that varies the selected phase shift and determines a current symbol within the data modulated signal based on the amplitude of the summed signal as the selected phase shift is varied. A corresponding method is also disclosed herein.
    Type: Grant
    Filed: June 4, 2018
    Date of Patent: May 7, 2019
    Assignee: International Business Machines Corporation
    Inventors: Alberto Valdes Garcia, Wayne H. Woods, Jr., Bodhisatwa Sadhu
  • Bipolar junction transistor based switched capacitors
    Patent number: 10236825
    Abstract: A switched capacitor is provided. The switched capacitor includes a pair of parallel component stacks. Each stack is connected to a common top node and a common bottom node. Each stack includes a BJT. Each stack further includes a first resistor in series with the BJT and having a first side connected to a collector of the BJT at an intermediate node in a same one of the stacks and a second side connected to the common top node. Each stack also includes a capacitor having a first side connected to the intermediate node and a second side for providing an impedance. Each stack additionally includes a second resistor having a first side connected to a base of the BJT to prevent base-current surge in the BJT and a second side connected to a switch base control signal that selectively turns the BJT on or off.
    Type: Grant
    Filed: October 3, 2017
    Date of Patent: March 19, 2019
    Assignee: International Business Machines Corporation
    Inventors: Alberto Valdes Garcia, Bodhisatwa Sadhu, Jahnavi Sharma
  • Phase noise reduction in voltage controlled oscillators
    Patent number: 10224872
    Abstract: A voltage controlled oscillator (VCO), a method of designing a voltage controlled oscillator, and a design structure comprising a semiconductor substrate including a voltage controlled oscillator are disclosed. In one embodiment, the VCO comprises an LC tank circuit for generating an oscillator output at an oscillator frequency, and an oscillator core including cross-coupled semiconductor devices to provide feedback to the tank circuit. The VCO further comprises a supply node, a tail node, and a noise by-pass circuit connected to the supply and tail nodes, in parallel with the tank circuit and the oscillator core. The by-pass circuit forms a low-impedance path at a frequency approximately twice the oscillator frequency to at least partially immunize the oscillator core from external noise and to reduce noise contribution from the cross-coupled semiconductor devices.
    Type: Grant
    Filed: April 7, 2016
    Date of Patent: March 5, 2019
    Assignee: International Business Machines Corporation
    Inventors: Alberto Valdes-Garcia, Bodhisatwa Sadhu
  • Boosting varactor capacitance ratio
    Patent number: 10211779
    Abstract: A voltage controlled oscillator comprises a negative resistance, a first inductor, a fixed capacitor, and a frequency control component. The frequency control component comprises at least one varactor and at least a second inductor connected in series with the at least one varactor. A magnitude of an inductance of the second inductor is selected such that the frequency control component has an effective capacitance range larger than a capacitance range of the at least one varactor.
    Type: Grant
    Filed: May 11, 2016
    Date of Patent: February 19, 2019
    Assignee: International Business Machines Corporation
    Inventors: Mark A. Ferriss, Daniel J. Friedman, Bodhisatwa Sadhu, Alberto Valdes-Garcia
  • DIRECT RF DEMODULATION
    Publication number: 20190052493
    Abstract: An apparatus for decoding a data modulated signal includes a signal receiver that receives a data modulated signal that is encoded with phase-shift keying (PSK) and provides an amplified signal corresponding to the data modulated signal, a tunable phase shifter that receives a local reference signal and a selected phase shift, applies the selected phase shift to the local reference signal to produce a phase shifted reference signal, a summing unit that sums the amplified signal and the phase shifted reference signal to produce a summed signal, an amplitude detector that determines an amplitude of the summed signal, and a symbol detector that varies the selected phase shift and determines a current symbol within the data modulated signal based on the amplitude of the summed signal as the selected phase shift is varied. A corresponding method is also disclosed herein.
    Type: Application
    Filed: June 4, 2018
    Publication date: February 14, 2019
    Inventors: Alberto Valdes Garcia, Wayne H. Woods, JR., Bodhisatwa Sadhu
  • TWO-DIMENSIONAL SCANNING CYLINDRICAL REFLECTOR
    Publication number: 20190051982
    Abstract: A parabolic cylindrical reflector antenna that comprises two or more antenna feeds each directed towards a parabolic cylindrical reflector, wherein the antenna feeds are positioned in one or more line-arrays parallel to a focal line of the parabolic cylindrical reflector, and the line-array is substantially centered opposing the reflector. The antenna comprises a controller configured to scan along a straight edge of the reflector by electronically adjusting a phase of each of the antenna feeds, thereby changing the incident angle of an energy beam relative to the reflector. The controller is configured to scan along a curved edge of the reflector by moving, using a mechanical positioning mechanism, the antenna feeds in a direction parallel to a directrix of the reflector while maintaining the positioning or by electronically selecting one of two or more parallel line-arrays.
    Type: Application
    Filed: October 16, 2018
    Publication date: February 14, 2019
    Inventors: DANNY ELAD, Daniel Friedman, Noam Kaminski, Ofer Markish, Alberto Valdes Garcia
  • RECONFIGURABLE RADAR TRANSMITTER
    Publication number: 20190044550
    Abstract: Techniques that facilitate reconfigurable transmission of a radar frequency signal are provided. In one example, a system includes a signal generator and a power modulator. The signal generator provides a radar waveform signal from a set of radar waveform signals. The power modulator divides a local oscillator signal associated with a first frequency and a first amplitude into a first local oscillator signal and a second local oscillator signal. The power modulator also generates a radio frequency signal associated with a second frequency and a second amplitude based on the radar waveform signal, the first local oscillator signal and the second local oscillator signal.
    Type: Application
    Filed: August 3, 2017
    Publication date: February 7, 2019
    Inventors: Tolga Dinc, Mark A. Ferriss, Daniel Joseph Friedman, Wooram Lee, Bodhisatwa Sadhu, Alberto Valdes Garcia
  • RECONFIGURABLE RADAR TRANSMITTER
    Publication number: 20190044551
    Abstract: Techniques that facilitate reconfigurable transmission of a radar frequency signal are provided. In one example, a system includes a signal generator and a power modulator. The signal generator provides a radar waveform signal from a set of radar waveform signals. The power modulator divides a local oscillator signal associated with a first frequency and a first amplitude into a first local oscillator signal and a second local oscillator signal. The power modulator also generates a radio frequency signal associated with a second frequency and a second amplitude based on the radar waveform signal, the first local oscillator signal and the second local oscillator signal.
    Type: Application
    Filed: December 14, 2017
    Publication date: February 7, 2019
    Inventors: Tolga Dinc, Mark A. Ferriss, Daniel Joseph Friedman, Wooram Lee, Bodhisatwa Sadhu, Alberto Valdes Garcia
  • TRANSFORMER BASED SHIELDED OSCILLATOR
    Publication number: 20190036485
    Abstract: An oscillator includes a first output node and a second output node. There is a tank circuit coupled between the first output node and the second output node. There is a first transistor having a first node, a second node coupled to a current source, and a control node coupled to the second output node. There is a second transistor having a first node, a second node coupled to the current source, and a control node coupled to the first output node. There is a first inductor coupled in series between the first node of the first transistor and the first output node. There is a second inductor coupled in series between the first node of the second transistor and the second output node.
    Type: Application
    Filed: September 22, 2018
    Publication date: January 31, 2019
    Inventors: Tejasvi Anand, Mark A. Ferriss, Bodhisatwa Sadhu, Alberto Valdes Garcia
  • PHASE NOISE REDUCTION IN VOLTAGE CONTROLLED OSCILLATORS
    Publication number: 20180375472
    Abstract: A voltage controlled oscillator (VCO), a method of designing a voltage controlled oscillator, and a design structure comprising a semiconductor substrate including a voltage controlled oscillator are disclosed. In one embodiment, the VCO comprises an LC tank circuit for generating an oscillator output at an oscillator frequency, and an oscillator core including cross-coupled semiconductor devices to provide feedback to the tank circuit. The VCO further comprises a supply node, a tail node, and a noise by-pass circuit connected to the supply and tail nodes, in parallel with the tank circuit and the oscillator core. The by-pass circuit forms a low-impedance path at a frequency approximately twice the oscillator frequency to at least partially immunize the oscillator core from external noise and to reduce noise contribution from the cross-coupled semiconductor devices.
    Type: Application
    Filed: August 1, 2018
    Publication date: December 27, 2018
    Inventors: Alberto Valdes-Garcia, Bodhisatwa Sadhu
  • Two-dimensional scanning cylindrical reflector
    Patent number: 10158170
    Abstract: A parabolic cylindrical reflector antenna that comprises two or more antenna feeds each directed towards a parabolic cylindrical reflector, wherein the antenna feeds are positioned in one or more line-arrays parallel to a focal line of the parabolic cylindrical reflector, and the line-array is substantially centered opposing the reflector. The antenna comprises a controller configured to scan along a straight edge of the reflector by electronically adjusting a phase of each of the antenna feeds, thereby changing the incident angle of an energy beam relative to the reflector. The controller is configured to scan along a curved edge of the reflector by moving, using a mechanical positioning mechanism, the antenna feeds in a direction parallel to a directrix of the reflector while maintaining the positioning or by electronically selecting one of two or more parallel line-arrays.
    Type: Grant
    Filed: January 25, 2016
    Date of Patent: December 18, 2018
    Assignee: International Business Machines Corporation
    Inventors: Danny Elad, Daniel Friedman, Noam Kaminski, Ofer Markish, Alberto Valdes Garcia
  • Graphene-based micro-scale identification system
    Patent number: 10157338
    Abstract: A system for labeling an object uses at least one object label made from a material that absorbs and reflects incident energy uniformly across all wavelengths of incident energy at a ratio proportional to a thickness of the material and that includes a pattern having variations in the thickness of the material along at least one of two orthogonal directions across the label. An interrogator directs a predetermined wavelength of radiation to the at least one label, and a reader to receives reflected radiation from the label at the predetermined wavelength and interprets the reflected radiation to recognize the pattern.
    Type: Grant
    Filed: May 4, 2016
    Date of Patent: December 18, 2018
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Alberto Valdes Garcia, Dirk Pfeiffer, Fengnian Xia
  • Transformer based shielded oscillator
    Patent number: 10153727
    Abstract: An oscillator includes a first output node and a second output node. There is a tank circuit coupled between the first output node and the second output node. There is a first transistor having a first node, a second node coupled to a current source, and a control node coupled to the second output node. There is a second transistor having a first node, a second node coupled to the current source, and a control node coupled to the first output node. There is a first inductor coupled in series between the first node of the first transistor and the first output node. There is a second inductor coupled in series between the first node of the second transistor and the second output node.
    Type: Grant
    Filed: May 12, 2016
    Date of Patent: December 11, 2018
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Tejasvi Anand, Mark A. Ferriss, Bodhisatwa Sadhu, Alberto Valdes Garcia
  • Using common mode local oscillator termination in single-ended commutating circuits for conversion gain improvement
    Patent number: 10057093
    Abstract: A commutating circuit includes a single-ended mixer and a passive network. The single-ended mixer includes a differential local oscillator terminal. The passive network includes a plurality of inductors and a capacitor. The plurality of inductors can be coupled to the differential local oscillator terminal. The plurality of inductors can provide an impedance in accordance with a common mode or a differential mode. The commutating circuit can be implemented via a device, a system and/or a method.
    Type: Grant
    Filed: June 29, 2016
    Date of Patent: August 21, 2018
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Wooram Lee, Jean-Olivier Plouchart, Alberto Valdes Garcia
  • Waveguide including first and second metal plates and having a slotted feed to waveguide transition disposed in the first metallic plate
    Patent number: 10056672
    Abstract: Embodiments include package structures having integrated waveguides to enable high data rate communication between package components. For example, a package structure includes a package substrate having an integrated waveguide, and first and second integrated circuit chips mounted to the package substrate. The first integrated circuit chip is coupled to the integrated waveguide using a first transmission line to waveguide transition, and the second integrated circuit chip is coupled to the integrated waveguide using a second transmission line to waveguide transition. The first and second integrated circuit chips are configured to communicate by transmitting signals using the integrated waveguide within the package carrier.
    Type: Grant
    Filed: July 28, 2016
    Date of Patent: August 21, 2018
    Assignee: International Business Machines Corporation
    Inventors: Bing Dang, Duixian Liu, Jean-Olivier Plouchart, Alberto Valdes-Garcia
  • Semiconductor wafer including an integrated waveguide for communicating signals between first and second integrated circuit dies
    Patent number: 10038232
    Abstract: Embodiments include package structures having integrated waveguides to enable high data rate communication between package components. For example, a package structure includes a package substrate having an integrated waveguide, and first and second integrated circuit chips mounted to the package substrate. The first integrated circuit chip is coupled to the integrated waveguide using a first transmission line to waveguide transition, and the second integrated circuit chip is coupled to the integrated waveguide using a second transmission line to waveguide transition. The first and second integrated circuit chips are configured to communicate by transmitting signals using the integrated waveguide within the package carrier.
    Type: Grant
    Filed: July 28, 2016
    Date of Patent: July 31, 2018
    Assignee: International Business Machines Corporation
    Inventors: Bing Dang, Duixian Liu, Jean-Olivier Plouchart, Alberto Valdes-Garcia
  • DYNAMIC PHASED ARRAY TAPERING WITHOUT PHASE RECALIBRATION
    Publication number: 20180212580
    Abstract: Variable gain amplifiers and methods of designing the same include a first amplifying transistor configured to receive a first input signal and to provide a first amplified output signal based on the first input signal. A phase compensating resistor is connected to the first amplifying transistor and has a resistance calibrated as: R e = ? b C be , par where ?b is the base transit time of the first amplifying transistor and Cbe,par is the gain-independent part of the base-emitter capacitance of the first amplifying transistor.
    Type: Application
    Filed: March 20, 2018
    Publication date: July 26, 2018
    Inventors: John F. Bulzacchelli, Bodhisatwa Sadhu, Alberto Valdes Garcia
  • Package structure including a package substrate having an integrated waveguide coupled to first and second integrated circuits, where the package substrate is mounted to an application board
    Patent number: 10033081
    Abstract: Embodiments include package structures having integrated waveguides to enable high data rate communication between package components. For example, a package structure includes a package substrate having an integrated waveguide, and first and second integrated circuit chips mounted to the package substrate. The first integrated circuit chip is coupled to the integrated waveguide using a first transmission line to waveguide transition, and the second integrated circuit chip is coupled to the integrated waveguide using a second transmission line to waveguide transition. The first and second integrated circuit chips are configured to communicate by transmitting signals using the integrated waveguide within the package carrier.
    Type: Grant
    Filed: July 28, 2016
    Date of Patent: July 24, 2018
    Assignee: International Business Machines Corporation
    Inventors: Bing Dang, Duixian Liu, Jean-Olivier Plouchart, Alberto Valdes-Garcia
  • Stacked SOI lateral bipolar transistor RF power amplifier and driver
    Patent number: 10026752
    Abstract: An amplifier circuit including a substrate layer and a plurality of lateral bipolar junction transistors positioned entirely above the substrate. The lateral bipolar junction transistors include a plurality of monolithic emitter-collector regions coplanar to each other. Each of the emitter-collector regions is both an emitter region of a first bipolar junction transistor a collector region of a second bipolar junction transistor from the lateral bipolar junction transistors. Accordingly, the lateral bipolar junction transistors are electrically coupled in series circuit at the emitter-collector regions.
    Type: Grant
    Filed: August 28, 2016
    Date of Patent: July 17, 2018
    Assignee: International Business Machines Corporation
    Inventors: Alberto Valdes Garcia, Tak H. Ning, Jean-Olivier Plouchart, Ghavam G. Shahidi, Jeng-Bang Yau