Patents Examined by Arnold Kinkead
  • Patent number: 10263626
    Abstract: Apparatus and methods for tuning a voltage controlled oscillator (VCO) are provided. In one aspect, a method of auto-tuning in a phase-locked loop includes generating a VCO clock signal using a VCO coupled to a capacitor array, dividing the VCO clock signal to generate a divided clock signal using a prescaler circuit having a selectable division ratio, controlling a value of the selectable division ratio using a first counter and a second counter of a counter module, generating a phase-frequency detector feedback signal based on a division control signal M and the divided clock signal using the counter module, counting a number of cycles of the divided clock signal that occur during a calibration interval using a cycle counter of a digital processing logic circuit, and determining the value of a capacitor array control signal based on the number of cycles counted during the calibration interval.
    Type: Grant
    Filed: October 6, 2016
    Date of Patent: April 16, 2019
    Assignee: Skyworks Solutions, Inc.
    Inventors: Hua Wang, David Steven Ripley, Bryan J. Roll
  • Patent number: 10263565
    Abstract: A non-linear transmission line device includes a magnetic element having at least one end profiled to reduce demagnetization when the element is biased. The profile may be tapered, stepped, or smoothly curved. Also disclosed is a non-linear transmission device made up of a solid magnetic element, typically of flat rectangular form.
    Type: Grant
    Filed: June 25, 2014
    Date of Patent: April 16, 2019
    Assignee: BAE SYSTEMS plc
    Inventors: John Eric Dolan, Matthew James Jenkins
  • Patent number: 10263020
    Abstract: Provided is a planar nano-oscillator array having phase locking function, including two or more planar nano-oscillators which are arranged in parallel. The two oscillators are connected by planar resistors and capacitors, and a structure thereof includes: electrodes; respectively introducing two pairs of laterally arranged parallel insulation notch grooves into two-dimensional electron gas layers, so as to form oscillation channels; vertically disposing separating insulation notch grooves, so that a planar resistor A with low resistance which is connected to the electrode is formed on the left side, and a planar resistor B with low resistance which is connected to the electrode is formed on the right side; and arranging, between the two oscillators, an insulation capacitor notch groove which is parallel to the oscillation channels, insulating materials having a high dielectric constant being filled therein.
    Type: Grant
    Filed: December 23, 2014
    Date of Patent: April 16, 2019
    Assignee: SOUTH CHINA NORMAL UNIVERSITY
    Inventor: Kunyuan Xu
  • Patent number: 10256825
    Abstract: An oven controlled crystal oscillator that ensures reduced heat influence from outside to further stabilize an output frequency is provided. The oven controlled crystal oscillator includes a substrate secured above a base. The oven controlled crystal oscillator includes an oscillator circuit, a heater resistor, and a power transistor, which are mounted on the substrate. The oven controlled crystal oscillator includes pins that secures the substrate above the base at a predetermined interval, a metal cover that covers the oscillator circuit, the heater resistor, and the power transistor, and a resin cover that covers outside of the metal cover. An air layer is formed between the metal cover and the resin cover.
    Type: Grant
    Filed: March 4, 2015
    Date of Patent: April 9, 2019
    Assignee: NIHON DEMPA KOGYO CO., LTD.
    Inventor: Junichi Arai
  • Patent number: 10256797
    Abstract: According to embodiments of the present invention, an oscillator is provided. The oscillator includes a switched capacitor circuit arrangement configured to generate a predetermined voltage, a transconductance-capacitor filter configured to receive the predetermined voltage and a reference voltage, and to generate an output filter voltage based on a differential result between the predetermined voltage and the reference voltage, wherein a value of the output filter voltage is variable in response to the differential result, and a period control circuit arrangement configured to receive the output filter voltage, and further configured to generate an oscillator signal, wherein a period of the oscillator signal is variable in response to the value of the output filter voltage, wherein the oscillator is configured to control the switched capacitor circuit arrangement based on the oscillator signal to generate the predetermined voltage to be matched to the reference voltage.
    Type: Grant
    Filed: June 2, 2015
    Date of Patent: April 9, 2019
    Assignee: Agency for Science, Technology and Research
    Inventor: Yat Hei Lam
  • Patent number: 10250271
    Abstract: According to one embodiment, a quantum computation apparatus includes a plurality of quantum nonlinear oscillators, a controller, and a measuring device. Each of the quantum nonlinear oscillators implements superposition of distinguishable quantum states by bifurcating one quantum state via a quantum adiabatic change controlled by a bifurcation parameter. The quantum nonlinear oscillators couple with each other by nondissipative coupling accompanying no loss. The controller individually controls the bifurcation parameters of the quantum nonlinear oscillators. A measuring device measures outputs from the quantum nonlinear oscillators.
    Type: Grant
    Filed: September 13, 2016
    Date of Patent: April 2, 2019
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Hayato Goto
  • Patent number: 10250263
    Abstract: Embodiments relate to a voltage oscillator (VCO) that uses a replica bias circuit to generate a cascode bias voltage. The VCO generate an output periodic signal having a frequency and phase that is less or not susceptible to voltage swings by using a bias voltage generated in a replica bias circuit that replicates a voltage-to-current converter in the VOC. The bias voltage is generated and regulated according to a power supply voltage that supplies power to the VCO to account for voltage variations in the power supply voltage.
    Type: Grant
    Filed: May 12, 2015
    Date of Patent: April 2, 2019
    Assignee: Lattice Semiconductor Corporation
    Inventors: Kexin Luo, Rui Yin, Xiaofeng Wang, Jie Yuan, Qiming Wu, Fei Song, Min-Kyu Kim
  • Patent number: 10236824
    Abstract: A voltage controlled oscillator (“VCO”) circuit is disclosed. The VCO includes a switch module comprising a first transistor and a second transistor; a first LC-tank module, the first LC-tank module is operatively connected between the drain of the first transistor and the drain of the second transistor; and a second LC-tank module, the second LC-tank module is operatively connected between the gate of the first transistor and the gate of the second transistor, the source of the first transistor and the source of the second transistor are operatively connected.
    Type: Grant
    Filed: October 19, 2016
    Date of Patent: March 19, 2019
    Assignee: Taiwan Semiconductor Manufacturing Co., Ltd.
    Inventors: Jun-De Jin, Ying-Ta Lu, Hsien-Yuan Liao
  • Patent number: 10230379
    Abstract: Techniques are disclosed relating to rapidly downshifting the output frequency of an oscillator. In some embodiments, the oscillator is configured to operate in a closed-loop mode in which negative feedback is used to maintain a particular output frequency (e.g., in a phase-locked loop (PLL)). In some embodiments, the negative feedback loop is configured to maintain the output of the oscillator at a particular frequency based on a reference clock signal and the output of the oscillator. The nature of a negative feedback loop may render rapid frequency changes difficult, e.g., because of corrections by the loop. Therefore, in some embodiments, the loop is configured to switch to an open-loop mode in which a control input to the oscillator is fixed. In some embodiments, the loop switches to open-loop mode in response to a trigger signal and control circuitry forces the oscillator to a new target frequency.
    Type: Grant
    Filed: May 4, 2016
    Date of Patent: March 12, 2019
    Assignee: Apple Inc.
    Inventors: Brian S. Leibowitz, Jared L. Zerbe, Sanjay Pant
  • Patent number: 10230351
    Abstract: Apparatus and methods for distributing spurious tones through the frequency domain are disclosed. One such apparatus can include a dithering circuit configured to generate a sequence of numbers that exhibit statistical randomness and a variable frequency circuit configured to adjust a frequency of an output based on the sequence of numbers so as to spread energy of spurious tones in a frequency response of the output to lower a noise floor. In one example, spurious tones can be reduced in a negative voltage generator of a radio frequency (RF) attenuator.
    Type: Grant
    Filed: August 16, 2016
    Date of Patent: March 12, 2019
    Assignee: Skyworks Solutions, Inc.
    Inventors: Thomas Obkircher, William J. Domino, Bipul Agarwal
  • Patent number: 10224943
    Abstract: An atomic oscillator includes a gas cell housing alkali metal atoms, a light source providing light to the gas cell, and a light detector that detects an amount of light transmitted through the gas cell. The light source includes a substrate, a first mirror layer on an upper portion of the substrate, an active layer on an upper portion of the first mirror layer, a second mirror layer on an upper portion of the active layer, a first contact layer on an upper portion of the second mirror layer, a light absorption layer on an upper portion of the first contact layer, and a second contact layer on an upper portion of the light absorption layer. As such, an output wavelength and the light output of the light source can be independently adjusted.
    Type: Grant
    Filed: October 10, 2016
    Date of Patent: March 5, 2019
    Assignee: Seiko Epson Corporation
    Inventor: Yasutaka Imai
  • Patent number: 10224875
    Abstract: A micro-electromechanical system (MEMS) frequency divider apparatus having one or more MEMS resonators on a substrate is presented. A first oscillator frequency, as an approximate multiple of the parametric oscillation frequency, is capacitively coupled from a very closely-spaced electrode (e.g., 40 nm) to a resonant structure of the first oscillator, thus inducing mechanical oscillation. This mechanical oscillation can be coupled through additional MEMS resonators on the substrate. The mechanical resonance is then converted, in at least one of the MEMS resonators, by capacitive coupling back to an electrical signal which is a division of the first oscillation frequency. Output may be generated as a single ended output, or in response to a differential signal between two output electrodes.
    Type: Grant
    Filed: June 1, 2016
    Date of Patent: March 5, 2019
    Assignee: THE REGENTS OF THE UNIVERSITY OF CALIFORNIA
    Inventors: Clark T.-C. Nguyen, Tristan O. Rocheleau
  • 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
  • Patent number: 10224833
    Abstract: Disclosed are a modulation method of a modular multilevel converter and a fault isolation method of a submodule unit. The modulation method comprises a first mode and a second mode, and the first mode and the second mode operate cyclically. In the first mode, a first power semiconductor switch and a second power semiconductor switch are turned on alternately, while a third power semiconductor switch is turned off normally and a fourth power semiconductor switch is turned on normally. In the second mode, the third power semiconductor switch and the fourth power semiconductor switch are turned on alternately, while the first power semiconductor switch is turned on normally and the second power semiconductor switch is turned off normally.
    Type: Grant
    Filed: July 13, 2016
    Date of Patent: March 5, 2019
    Assignees: NR ELECTRIC CO., LTD, NR ENGINEERING CO., LTD.
    Inventors: Yeyuan Xie, Dongming Cao, Tiangui Jiang, Minglian Zhu, Guanxian Yin
  • Patent number: 10216150
    Abstract: An apparatus for an atomic clock includes first and second distinctive substrates, each having at least a planar surface substantially parallel therebetween. The apparatus also includes a medium having particles capable of undergoing energetic transition between at least two energy levels, said medium being located in the space defined between the planar surfaces. It further includes a magnetic device arranged to the first substrate and generating at least in the volume of the medium a predetermined static magnetic field B the direction of which is substantially parallel or perpendicular to the planar surfaces and an excitation device arranged to the second substrate and generating an excitation magnetic field H at, at least an excitation frequency, the direction of said excitation magnetic field H in the volume of the medium being substantially orthogonal to said direction of the static magnetic field B.
    Type: Grant
    Filed: July 1, 2016
    Date of Patent: February 26, 2019
    Assignee: MEMSCAP
    Inventor: Nicolas Bertsch
  • Patent number: 10211839
    Abstract: A bias-current-control circuit is provided. The bias-current-control circuit includes a transconductance circuit, a constant-current source, and a current-mirror circuit. The transconductance circuit is connected to a node and detects a voltage signal to generate a first current. The constant-current source is connected to the node and generates a tail current. The current-mirror circuit includes a reference current terminal and a bias current terminal, and the reference current terminal is coupled to the node. A second current which flows through the reference current terminal is determined by a current difference between the tail current and the first current. A bias current which flows through the bias current terminal is generated based on the second current. Furthermore, the second current and the bias current are in a predetermined ratio.
    Type: Grant
    Filed: October 31, 2016
    Date of Patent: February 19, 2019
    Assignee: VIA ALLIANCE SEMICONDUCTOR CO., LTD.
    Inventor: Yongqi Zhou
  • Patent number: 10205422
    Abstract: In accordance with an embodiment, a voltage controlled oscillator (VCO) includes a VCO core having a plurality of transistors and a varactor circuit that has a first end coupled to emitter terminals of the VCO core and a second end coupled to a tuning terminal. The varactor circuit includes a capacitance that increases with increasing voltage applied to the tuning terminal with respect to the emitter terminals of the VCO core.
    Type: Grant
    Filed: September 15, 2016
    Date of Patent: February 12, 2019
    Assignee: INFINEON TECHNOLOGIES AG
    Inventor: Saverio Trotta
  • Patent number: 10205455
    Abstract: The disclosure provides a universal oscillator. The oscillator includes an amplifier array. The amplifier array includes one or more amplifiers. A control logic unit is coupled to the amplifier array and activates the one or more amplifiers. A self-clock generating circuit is coupled to the control logic unit and generates a fixed clock. A counter receives the fixed clock from the self-clock generating circuit and provides a controlled clock to the control logic unit.
    Type: Grant
    Filed: August 23, 2016
    Date of Patent: February 12, 2019
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventor: Nagalinga Swamy Basayya Aremallapur
  • Patent number: 10200045
    Abstract: A spread spectrum clock generator circuit includes a phase comparator; an oscillator to output an output clock signal; a phase selector to select one of phases equally dividing one cycle of the output clock signal, and to generate a phase shift clock signal having a rising edge in the selected phase; and a phase shift controller to control the phase selector. The phase shift controller generates a variable phase shift amount; determines the phase of the rising edge so that the cycle of the phase shift clock signal has a length changed from the cycle of the output clock signal by the variable phase shift amount added with a fixed phase shift amount; and changes a setting of an SS modulation profile if the selected phase exceeds an upper limit, falls below a lower limit, or is within the upper and lower limits.
    Type: Grant
    Filed: January 27, 2017
    Date of Patent: February 5, 2019
    Assignee: Ricoh Company, Ltd.
    Inventor: Senta Sekido
  • Patent number: 10200036
    Abstract: Provided is a Precision Voltage Reference (PVR). In one example, the PVR includes a resonator having an oscillation frequency, the resonator including a first proof-mass, a first forcer located adjacent a first side of the first proof-mass, and a second forcer located adjacent a second side of the first proof-mass. The PVR may include control circuitry configured to generate a reference voltage based on the oscillation frequency of the resonator, at least one converter configured to receive the reference voltage from the control circuitry, provide a first bias voltage to the first forcer based on the reference voltage, provide a second bias voltage to the second forcer based on the reference voltage, and periodically alter a polarity of the first and second bias voltages to drive the oscillation frequency to match a reference frequency, and an output configured to provide the reference voltage as a voltage reference signal.
    Type: Grant
    Filed: June 7, 2016
    Date of Patent: February 5, 2019
    Assignee: THE CHARLES STARK DRAPER LABORATORY, INC.
    Inventors: Paul A. Ward, James S. Pringle, Marc S. Weinberg, Warner G. Harrison