Variable Inductance Device (e.g., Saturable Core Or Adjustable Vane Inductor) Patents (Class 331/181)
  • Patent number: 9641170
    Abstract: A power efficient device for driving a load comprising a low current path and a high current path, wherein the high current path is driven by a first voltage source. In order to accommodate larger turn on voltages of possible load devices while maintaining low power operation, an additional voltage source exceeding the voltage source in the high current path is introduced in the low current path.
    Type: Grant
    Filed: July 30, 2015
    Date of Patent: May 2, 2017
    Assignee: COSEMI TECHNOLOGIES, INC.
    Inventors: Wu-Chun Chou, Robert Monroe Smith, Iain Ross MacTaggart, John Joseph Stronczer, Charles Phillip McClay
  • Patent number: 9551607
    Abstract: Disclosed is a method of measuring the level of a liquid in a vessel, such as a chemical reactor, by radar. The method particularly pertains to situations wherein a supercritical fluid is present above the liquid. More particularly, the method serves to cope with the typical vigorous circumstances of a chemical reaction, such as urea synthesis. The invention foresees the use of a tube extending into the liquid, so as to guide the radar waves to the surface level of the liquid.
    Type: Grant
    Filed: September 3, 2012
    Date of Patent: January 24, 2017
    Assignee: STAMICARBON B.V.
    Inventor: Klement Riegman
  • Patent number: 9330830
    Abstract: The present disclosure provides a semiconductor device. The semiconductor device includes a first inductor formed on a first substrate; a second inductor formed on a second substrate and conductively coupled with the first inductor as a transformer; and a plurality of micro-bump features configured between the first and second substrates. The plurality of micro-bump features include a magnetic material having a relative permeability substantially greater than one and are configured to enhance coupling between the first and second inductors.
    Type: Grant
    Filed: March 17, 2015
    Date of Patent: May 3, 2016
    Assignee: Taiwan Semiconductor Manufacturing Company, Ltd.
    Inventors: Hsiao-Tsung Yen, Yu-Ling Lin, Ying-Ta Lu, Huan-Neng Chen, Ho-Hsiang Chen
  • Patent number: 9071193
    Abstract: A system and method are provided for augmenting frequency tuning resolution in an L-C oscillatory circuit which comprises a source of electrical energy, and a tuned section energized by said source of electrical energy for oscillatory conduction of a resonant current therethrough. The tuned section includes an inductor portion extending in substantially looped manner between first and second connection points to define at least one turn. A primary capacitor portion is connected across at least a primary segment of the conductive member delineated by the first and second connection points. The tuned section further includes a secondary capacitor portion connected across a secondary segment of the conductive member intermediately tapped from the primary segment.
    Type: Grant
    Filed: October 16, 2013
    Date of Patent: June 30, 2015
    Assignee: Cadence Design Systems, Inc.
    Inventors: Anthony Caviglia, Eric H. Naviasky, Hugh Thompson
  • Publication number: 20150065068
    Abstract: An inductor layout (200, 300, 400) comprising a first inductor (210, 310, 410) and a second inductor (220, 320, 420). The first and second inductors (210, 310, 410; 220, 320, 420) are electrically and magnetically independent inductors concentrically arranged on an integrated circuit 800. At least one of the first and second inductors (210, 310, 410; 220, 320, 420) is a multi-loop inductor with a first axis (226a, 316a, 326a, 416a, 426a) of symmetry.
    Type: Application
    Filed: April 2, 2013
    Publication date: March 5, 2015
    Applicant: Ericsson Modems SA
    Inventors: Thomas Mattsson, Pietro Andreani
  • Patent number: 8957739
    Abstract: The present disclosure relates to a device and method to reduce voltage headroom within a voltage-controlled oscillator by utilizing trifilar coupling or transformer feedback with a capacitive coupling technique. In some embodiments of trifilar coupling, a VCO comprises cross-coupled single-ended oscillators, wherein the voltage of first gate within a first single-ended oscillator is separated from the voltage of a second drain within a second single-ended oscillator within the cross-coupled pair.
    Type: Grant
    Filed: January 18, 2013
    Date of Patent: February 17, 2015
    Assignee: Taiwan Semiconductor Manufacturing Co., Ltd.
    Inventors: Ying-Ta Lu, Hsien-Yuan Liao, Ho-Hsiang Chen, Chewn-Pu Jou
  • Patent number: 8948710
    Abstract: In a receiving device, an oscillating section generates a local oscillating signal for performing frequency conversion of one reception target channel of channels in broadcasting in a first frequency band and channels in broadcasting in a second frequency band; a first receiving section generates a channel signal based on the local oscillating signal and a high-frequency signal in the first frequency band when the reception target channel is a channel in the first frequency band, and does not perform the generation when the reception target channel is a channel in the second frequency band; and second receiving section generates a channel signal based on the local oscillating signal and a high-frequency signal in the second frequency band when the reception target channel is a channel in the second frequency band, and does not perform the generation when the reception target channel is a channel in the first frequency band.
    Type: Grant
    Filed: April 16, 2013
    Date of Patent: February 3, 2015
    Assignee: Sony Corporation
    Inventor: Noboru Sasho
  • Publication number: 20140361845
    Abstract: A variable capacitance circuit includes a plurality of variable capacitance elements (varicaps) each having the capacitance value controlled in accordance with the inter-terminal voltage applied between the terminals of the variable capacitance element and connected in parallel to each other, has the combined capacitance value of the plurality of variable capacitance elements variable taking a predetermined capacitance value as a base, sets the inter-terminal voltage of at least one of the plurality of variable capacitance elements to a first voltage as a variable voltage, and sets the inter-terminal voltage of the rest of the plurality of variable capacitance elements to a second voltage as a stationary voltage.
    Type: Application
    Filed: June 6, 2014
    Publication date: December 11, 2014
    Inventor: Hisahiro ITO
  • Patent number: 8860521
    Abstract: A variable inductor is disclosed. In accordance with some embodiments of the present disclosure, a variable inductor may comprise a single-turn conductor comprising a first inductor terminal, a second inductor terminal, a first base portion extending from the first inductor terminal to a first intersection location, a second base portion extending from the second inductor terminal to a second intersection location, and a switched portion extending from the first intersection location to the second intersection location, and a switch comprising a first conductive terminal coupled to the first intersection location and a second conductive terminal coupled to the second intersection location.
    Type: Grant
    Filed: December 19, 2012
    Date of Patent: October 14, 2014
    Assignee: Intel IP Corporation
    Inventors: Rizwan Ahmed, Curtiss Roberts, Chi Taou Tsai
  • Patent number: 8836443
    Abstract: Integrated circuits with phase-locked loops are provided. Phase-locked loops may include an oscillator, a phase-frequency detector, a charge pump, a loop filter, a voltage-controlled oscillator, and a programmable divider. The voltage-controlled oscillator may include multiple inductors, an oscillator circuit, and a buffer circuit. A selected one of the multiple inductors may be actively connected to the oscillator circuit. The voltage-controlled oscillators may have multiple oscillator circuits. Each oscillator circuit may be connected to a respective inductor, may include a varactor, and may be powered by a respective voltage regulator. Each oscillator circuit may be coupled to a respective input transistor pair in the buffer circuit through associated coupling capacitors. A selected one of the oscillator circuits may be turned on during normal operation by supplying a high voltage to the selected one of the oscillator circuit and by supply a ground voltage to the remaining oscillator circuits.
    Type: Grant
    Filed: September 14, 2012
    Date of Patent: September 16, 2014
    Assignee: Altera Corporation
    Inventors: Weiqi Ding, Sergey Shumarayev, Wilson Wong, Ali Atesoglu, Sharat Babu Ippili
  • Patent number: 8779865
    Abstract: A design for an oscillator, and a PLL incorporating such an oscillator, which takes up little physical area but maintains a large tuning range and low phase noise. Two LC-tanks are nested and switched. Through tuning the inactive tank, the range of the active tank may be increased and finer tuning becomes possible.
    Type: Grant
    Filed: January 16, 2012
    Date of Patent: July 15, 2014
    Assignee: International Business Machines Corporation
    Inventors: Herschel A. Ainspan, John F. Bulzacchelli, Daniel J. Friedman, Ankush Goel, Alexander V. Rylyakov
  • Patent number: 8742859
    Abstract: A tunable inductor circuit is disclosed. The tunable inductor circuit includes a first inductor. The tunable inductor circuit also includes a second inductor in parallel with the first inductor. The tunable inductor circuit also includes a switch coupled to the second inductor. A resistance of the switch is added in parallel to the first inductor based on operation of the switch.
    Type: Grant
    Filed: December 6, 2011
    Date of Patent: June 3, 2014
    Assignee: QUALCOMM Incorporated
    Inventors: Zhang Jin, Li Liu, Chiewcham Narathong
  • Patent number: 8729970
    Abstract: An oscillator circuit includes a pair of negative-resistance circuits, a pair of transmission lines coupled to the pair of negative-resistance circuits respectively, a pair of pads that are provided symmetrically to each other with respect to the pair of transmission lines and are to be coupled to each other by a bonding wire, and a synthetic circuit to synthesize output signals of the pair of negative-resistance circuits.
    Type: Grant
    Filed: June 8, 2012
    Date of Patent: May 20, 2014
    Assignee: Sumitomo Electric Industries, ltd.
    Inventor: Takeshi Kawasaki
  • Patent number: 8502614
    Abstract: There are provided a variable inductor with little degradation in quality factor, and an oscillator and a communication system using the variable inductor. An inductance controller comprising a reactance device with a variable device value, such as, for example, a variable capacitor, is connected to a secondary inductor, magnetically coupled to a primary inductor through mutual inductance. The inductance controller is provided with an inductance control terminal for receiving a control signal for controlling capacitance of the variable capacitor. Inductance of the primary inductor is varied by varying the capacitance by the control signal.
    Type: Grant
    Filed: January 11, 2011
    Date of Patent: August 6, 2013
    Assignee: Renesas Electronics Corporation
    Inventors: Takahiro Nakamura, Toru Masuda
  • Patent number: 8422981
    Abstract: An integrated circuit (IC) includes multiple circuits isolated with respect to one another. Each circuit of the multiple circuits includes an inductor pair formed in a loop pattern on a same layer as at least one other inductor pair from another circuit of the multiple circuits, such that the inductor pair surrounds and is isolated from the at least one other inductor pair.
    Type: Grant
    Filed: December 15, 2010
    Date of Patent: April 16, 2013
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Hyun-Won Mun, Seong-Han Ryu, Il-Ku Nam
  • Patent number: 8390386
    Abstract: A variable inductor includes: a first inductor having two ends connected to a first terminal and a second terminal; a second inductor having two ends connected to the first terminal and the second terminal; a first node provided on the first inductor; a second node provided on the second inductor; and a switch element that switches between a conductive state and a non-conductive state between the first node and the second node.
    Type: Grant
    Filed: April 28, 2010
    Date of Patent: March 5, 2013
    Assignee: Renesas Electronics Corporation
    Inventor: Akira Tanabe
  • Patent number: 8339209
    Abstract: An inductor architecture for resonant clock distribution networks is described. This architecture allows for the adjustment of the natural frequency of a resonant clock distribution network, so that it achieves energy-efficient operation at multiple clock frequencies. The proposed architecture exhibits no inductor overheads. Such an architecture is generally applicable to semiconductor devices with multiple clock frequencies, and high-performance and low-power clocking requirements such as microprocessors, ASICs, and SOCs. Moreover, it is applicable to the binning of semiconductor devices according to achievable performance levels.
    Type: Grant
    Filed: October 12, 2010
    Date of Patent: December 25, 2012
    Assignee: Cyclos Semiconductor, Inc.
    Inventors: Marios C. Papaefthymiou, Alexander Ishii
  • Patent number: 8253504
    Abstract: A variable simulated inductor comprises an integrator connected to receive the voltage across the input to the circuit. The output of the inductor is connected to a control terminal of a transconductor connected across the input of the circuit. The gain of the transconductor is electronically controllable in order to control the inductance of the circuit. An oscillator using a variable simulated inductor and a piezoelectric resonator connected in parallel is also provided.
    Type: Grant
    Filed: December 12, 2008
    Date of Patent: August 28, 2012
    Assignee: ACP Advanced Circuit Purcuit AG
    Inventor: Qiuting Huang
  • Patent number: 8183943
    Abstract: When a direct-current voltage is applied from a power supply, a signal line generates a standing wave having the ¾ wavelength where a starting end of the signal line connected to the power supply is used as a node and a terminating end is used as an antinode. Strips are connected to a ground layer through switches, respectively. The switches switch connection and non-connection of the strips and the ground layer, under the control from a switch controller. By switching the connection and non-connection of the switches, the distance between the signal line and the ground layer is pseudo adjusted and the effective permittivity in a transmission line unit changes. Therefore, the frequency of the standing wave can be adjusted.
    Type: Grant
    Filed: June 16, 2010
    Date of Patent: May 22, 2012
    Assignee: Fujitsu Limited
    Inventor: Tszshing Cheung
  • Patent number: 8169269
    Abstract: In a Hartley voltage controlled oscillator (VCO) circuit comprising two inductors (Ld, Lg), a transistor (Q1) and a varactor (C), the two inductors (Ld, Lg) are arranged as a coupled inductor pair to enable positive mutual inductance (M) between them and reduce the size of the VCO.
    Type: Grant
    Filed: September 25, 2007
    Date of Patent: May 1, 2012
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventor: Mingquan Bao
  • Patent number: 8143960
    Abstract: According to one exemplary embodiment, a voltage controlled oscillator configured to operate in low and high band modes includes a low band section and a high band section. The voltage controlled oscillator further includes a multi-tap inductor having a high inductance portion coupled to the low band section and a low inductance portion coupled to the high band section. The low band section is configured to provide a low frequency band oscillator output in the low band mode and the high band section is configure to provide a high frequency band oscillator output in the high band mode. The low band section is disabled in the high band mode and the high band section is disabled in the low band mode. A center tap of the multi-tap inductor is coupled to a supply voltage.
    Type: Grant
    Filed: January 25, 2008
    Date of Patent: March 27, 2012
    Assignee: Broadcom Corporation
    Inventor: Qiang Li
  • Patent number: 8115557
    Abstract: An electronic device is made from a first substrate with device circuitry including an inductor and a second substrate with inductance adjustment circuitry including a number of other inductors. The substrates are assembled together to be opposite one another. The other inductors are arranged to provide a selection of different mutual inductance relationships relative to the inductor. These relationships are selectable during operation of the device to provide a variable inductance in the device circuitry.
    Type: Grant
    Filed: November 15, 2005
    Date of Patent: February 14, 2012
    Assignee: NXP B.V.
    Inventors: Yann Bouttement, Serge Bardy, Luuk F. Tiemeijer
  • Patent number: 8106714
    Abstract: An adjustable capacitor is provided including a capacitor unit including a plurality of capacitor groups aligned in a matrix format and a switch unit to adjust capacitance by connecting the plurality of capacitor groups in parallel according to a selection signal of a column and row of the matrix. Accordingly, the adjustable capacitor may be realized of a small size but with a high capacitance change rate.
    Type: Grant
    Filed: December 4, 2009
    Date of Patent: January 31, 2012
    Assignees: Samsung Electronics Co., Ltd., Seoul National University R&DB Foundation
    Inventors: Do-hwan Oh, Kyo-Jin Choo, Deog-Kyoon Jeong
  • Patent number: 8102218
    Abstract: An inductor circuit includes a pair of inductors connected in parallel with each other and a switch for turning on and off electric power to one of the pair of inductors. The inductance of the inductor circuit can be varied and the quality factor Q can be improved. Further, RF circuits employing the inductor circuit can generate an intended operating frequency.
    Type: Grant
    Filed: November 21, 2008
    Date of Patent: January 24, 2012
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Yun-seong Eo, Hee-mun Bang, Kwang-du Lee, Heung-bae Lee
  • Patent number: 8063712
    Abstract: Methods and systems for VCO impedance control to optimize performance, efficiency, and power consumption are disclosed and may include selectively coupling one of a plurality of taps on a multi-tap inductive load to a voltage controlled oscillator (VCO) on a chip comprising a plurality of transmitters and receivers. The multi-tap inductive load may comprise a multi-tap transformer or transmission line, which may be integrated on the chip, or may be integrated on a package to which the chip is coupled. A voltage swing at an output of the VCO and/or a current in the VCO may be adjusted by configuring a load of the VCO utilizing the multi-tap inductive load. The multi-tap inductive load may be coupled to the VCO utilizing one or more CMOS switches.
    Type: Grant
    Filed: March 3, 2009
    Date of Patent: November 22, 2011
    Assignee: Broadcom Corporation
    Inventors: Ahmadreza Rofougaran, Maryam Rofougaran
  • Patent number: 8044732
    Abstract: A continuously tunable inductor with an inductive-capacitive (LC) voltage controlled oscillator (VCO) having a primary coil. The inductor includes a separate isolated secondary coil, a set of transistors composing a closed loop with the secondary coil, a magnetic coupling between the primary coil of the LC VCO and the secondary coil, an electrical coupling between the LC VCO and the set of transistors composing a closed loop with the secondary coil, and means for electric current injection into the closed loop. Such an inductor can be tuned by modulating a mutual inductance, which is magnetically and electrically coupled with the LC VCO by injection of an electric current (I0).
    Type: Grant
    Filed: February 11, 2009
    Date of Patent: October 25, 2011
    Assignee: International Business Machines Corporation
    Inventors: Marcel A. Kossel, Thomas E. Morf, Martin Leo Schmatz, Jonas R. Weiss
  • Patent number: 7952444
    Abstract: CMOS power oscillator and a method of frequency modulating a CMOS power oscillator. The oscillator comprises a transformer-based feedback CMOS power oscillator circuit formed on a chip-substrate, the oscillator circuit including a transformer coupled to a transistor; means for modulating the capacitance of the transformer to the chip-substrate for frequency modulating an output of the power oscillator.
    Type: Grant
    Filed: August 8, 2006
    Date of Patent: May 31, 2011
    Assignee: Agency for Science, Technology and Research
    Inventor: Yong Zhong Xiong
  • Patent number: 7936224
    Abstract: An embodiment of the voltage controlled oscillator is provided. The oscillator comprises a first inductor set, a second inductor set, a second capacitor, a voltage source and a negative resistance element. The inductance of the second inductor set is k times the inductance of the first inductor set. The voltage source applies an ac voltage to the second inductor set. The negative resistance element is coupled to the second inductor set to provide a negative resistance to resonate the second capacitor at the second inductor set.
    Type: Grant
    Filed: April 22, 2008
    Date of Patent: May 3, 2011
    Assignee: Mediatek Inc.
    Inventor: Jing-Hong Conan Zhan
  • Patent number: 7920030
    Abstract: A multi-phase voltage-control oscillator including a first voltage-control oscillator circuit and a second voltage-control oscillator circuit is provided. The second voltage-control oscillator circuit and the first voltage-control oscillator circuit have a plurality of inductors, and the inductors in the second voltage-control oscillator circuit are respectively cross-coupled with the inductors in the first voltage-control oscillator circuit to generate a mutual inductance effect, so as to output a plurality of oscillating signals with different phases.
    Type: Grant
    Filed: April 29, 2009
    Date of Patent: April 5, 2011
    Assignee: National Taiwan University of Science and Technology
    Inventors: Sheng-Lyang Jang, Yun-Hsueh Chuang, Ren-Hong Yen, Shao-Hua Lee
  • Patent number: 7915968
    Abstract: A digitally controlled oscillator (DCO) includes a current generator which generates an electric current having a magnitude corresponding to an input signal, and a digitally controlled oscillating unit which generates an oscillating frequency based on an inductance which varies according to the magnitude of the electric current generated by the current generator.
    Type: Grant
    Filed: April 17, 2008
    Date of Patent: March 29, 2011
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Tae-wook Kim, Choong-yul Cha, Jae-sup Lee, Kang-yoon Lee
  • Patent number: 7902934
    Abstract: There are provided a variable inductor with little degradation in quality factor, and an oscillator and a communication system using the variable inductor. An inductance controller comprising a reactance device with a variable device value, such as, for example, a variable capacitor, is connected to a secondary inductor, magnetically coupled to a primary inductor through mutual inductance. The inductance controller is provided with an inductance control terminal for receiving a control signal for controlling capacitance of the variable capacitor. Inductance of the primary inductor is varied by varying the capacitance by the control signal.
    Type: Grant
    Filed: November 8, 2005
    Date of Patent: March 8, 2011
    Assignee: Renesas Electronics Corporation
    Inventors: Takahiro Nakamura, Toru Masuda
  • Patent number: 7893786
    Abstract: An inductor circuit includes a pair of inductors connected in parallel with each other and a switch for turning on and off electric power to one of the pair of inductors. The inductance of the inductor circuit can be varied and the quality factor Q can be improved. Further, RF circuits employing the inductor circuit can generate an intended operating frequency.
    Type: Grant
    Filed: February 15, 2006
    Date of Patent: February 22, 2011
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Yun-seong Eo, Hee-mun Bang, Kwang-du Lee, Heung-bae Lee
  • Publication number: 20100225408
    Abstract: Methods and systems for VCO impedance control to optimize performance, efficiency, and power consumption are disclosed and may include selectively coupling one of a plurality of taps on a multi-tap inductive load to a voltage controlled oscillator (VCO) on a chip comprising a plurality of transmitters and receivers. The multi-tap inductive load may comprise a multi-tap transformer or transmission line, which may be integrated on the chip, or may be integrated on a package to which the chip is coupled. A voltage swing at an output of the VCO and/or a current in the VCO may be adjusted by configuring a load of the VCO utilizing the multi-tap inductive load. The multi-tap inductive load may be coupled to the VCO utilizing one or more CMOS switches.
    Type: Application
    Filed: March 3, 2009
    Publication date: September 9, 2010
    Inventors: Ahmadreza Rofougaran, Maryam Rofougaran
  • Patent number: 7782101
    Abstract: An injection-locked frequency divider for dividing a frequency of an injection signal and obtaining a frequency divided signal is provided. The injection-locked frequency divider includes a signal injection unit and an oscillator. The signal injection unit includes a first input terminal and a second input terminal for receiving the injection signal. The received injection signal exhibits a phase difference of 180° between the first input terminal and the second input terminal. The oscillator includes an inductor unit and a variable capacitance unit. The injection-locked frequency divider is featured with a wide injection locking range, and can be realized with a low operation voltage, and therefore can be conveniently used in different kinds of hybrid ICs.
    Type: Grant
    Filed: June 30, 2008
    Date of Patent: August 24, 2010
    Assignee: National Taiwan University of Science and Technology
    Inventors: Sheng-Lyang Jang, Cheng-Chen Liu
  • Patent number: 7750748
    Abstract: A Method and an apparatus for distributing a clock signal are disclosed. The apparatus for distributing a clock signal includes a pair of flat plates, a variable inductor and a connection channel. The pair of flat plates includes a clock flat plate having at least one of clock signal extraction points and a reference flat plate arranged in parallel to the clock flat plate. The inductor is connected between the pair of flat plates, and the connection channel is configured to connect electrically the at least one of clock signal extraction points to an external circuit. The inductor may be adjusted to have an inductance for generating a resonance signal of a target frequency from the pair of flat plates.
    Type: Grant
    Filed: May 31, 2007
    Date of Patent: July 6, 2010
    Assignee: Korea Advanced Institute of Science and Technology
    Inventors: Jongbae Park, Jeonghyeon Cho, Joungho Kim
  • Patent number: 7655536
    Abstract: Word lines of a NAND flash memory array are formed by concentric, rectangular shaped, closed loops that have a width of approximately half the minimum feature size of the patterning process used. The resulting circuits have word lines linked together so that peripheral circuits are shared. Separate erase blocks are established by shield plates.
    Type: Grant
    Filed: December 21, 2005
    Date of Patent: February 2, 2010
    Assignee: SanDisk Corporation
    Inventor: Masaaki Higashitani
  • Patent number: 7652541
    Abstract: A novel form of an integrated variable inductor uses an on-chip transformer together with a variable capacitor. The variable capacitor can either be a varactor or a switched capacitor array and is connected to the secondary coil of the transformer. By changing the capacitance at the secondary coil of a transformer, the equivalent inductance looking into the primary coil of the transformer can be adjusted. With another capacitor in parallel to the primary coil, two different modes of resonance inherently exist, and a very wide frequency tuning range can be achieved by combining the two modes.
    Type: Grant
    Filed: August 2, 2007
    Date of Patent: January 26, 2010
    Assignee: The Hong Kong University of Sciences and Technology
    Inventors: Howard Cam Luong, Lai Kan Leung
  • Patent number: 7649424
    Abstract: An L-C resonant circuit with an adjustable resonance frequency, having a capacitor and a first inductor electrically coupled together and a second inductor magnetically coupled to the first inductor. Additionally, there is a control circuit to sense a signal representing a first current flowing through the first inductor and to force through the second inductor a second current that is a replica of the first current for setting the adjustable resonance frequency of the L-C resonant circuit.
    Type: Grant
    Filed: January 16, 2008
    Date of Patent: January 19, 2010
    Assignee: STMicroelectronics S.r.l.
    Inventors: Giuseppe Cusmai, Matteo Repossi, Guido Albasini, Francesco Svelto
  • Patent number: 7633352
    Abstract: An integrated tunable resonance circuit is provided for providing a high-frequency output signal with a frequency dependent on a control signal, comprising a parallel resonance circuit with a first inductive element and an output for providing the high-frequency output signal, a switching unit with a controlled path, and a control terminal for switching between states, whereby the switching unit is designed to exhibit a predominantly capacitive behavior in a first state and a predominantly resistive behavior in a second state, whereby the resonance circuit is designed to drive the control terminal of the switching unit as a function of the control signal. The resonance circuit has a second inductive element which can be mutually coupled to the first inductive element, whereby the controlled path is connected parallel to the second inductive element. The invention relates furthermore to a voltage-controlled oscillator and to an integrated circuit.
    Type: Grant
    Filed: May 17, 2007
    Date of Patent: December 15, 2009
    Assignee: Atmel Duisburg GmbH
    Inventor: Samir El Rai
  • Publication number: 20090189706
    Abstract: An inductance-switchable dual-band voltage-controlled oscillation circuit is proposed, which is designed for integration to a high-frequency signal processing system, such as an ultra-wideband (UWB) circuit system, for providing a dual-band voltage-controlled oscillating signal generating function. The proposed voltage-controlled oscillation circuit is characterized by the use of a switchable inductance circuit architecture in lieu of a switchable capacitive circuit architecture for integration to a fixed-inductance circuit architecture to constitute a variable-inductance LC tuning circuit architecture that allows the provision of a dual-band oscillating signal generating function. Further, a current mirror circuit module is used to maintain the quality factor of the LC tuning circuit in both operating modes; a buffer-stage circuit architecture is used to achieve low power consumption, low phase noise, and broad tuning range.
    Type: Application
    Filed: June 19, 2008
    Publication date: July 30, 2009
    Applicant: NATIONAL TAIWAN UNIVERSITY
    Inventors: Wei-Yang Lee, Jean-Fu Kiang
  • Patent number: 7564319
    Abstract: An LC tack structure. The structure, including a set of wiring levels on top of a semiconductor substrate, the wiring levels stacked on top of each other from a lowest wiring level nearest the substrate to a highest wiring level furthest from the substrate; an inductor in the highest wiring level, the inductor confined within a perimeter of a region of the highest wiring level; and a varactor formed in the substrate, the varactor aligned completely under the perimeter of the region of the highest wiring level. The structure may additionally include an electric shield in a wiring level of the set of wiring levels between the lowest wiring level and the highest wiring level. Alternatively, the inductor includes a magnetic core and alternating electrically non-magnetic conductive metal coils and magnetic coils around the core.
    Type: Grant
    Filed: September 24, 2007
    Date of Patent: July 21, 2009
    Assignee: International Business Machines Corporation
    Inventors: Hanyi Ding, Kai D. Feng, Zhong-Xiang He, Xuefeng Liu
  • Publication number: 20090174493
    Abstract: An adjustable inductor includes a first conductor line to receive an alternating current (AC) signal, a second conductor line configured in a loop arrangement, to generate an inducting current upon receiving the AC signal at the first conductor line, and a switch to adjust an inductance of the first conductor line by switching a loop connection of the second conductor line according to an external control signal.
    Type: Application
    Filed: April 18, 2008
    Publication date: July 9, 2009
    Inventors: Sang-yoon Jeon, Heung-bae Lee, Choong-yul Cha, Hee-mun Bang, Sung-jae Jung, Kyu-don Choi
  • Patent number: 7551038
    Abstract: A multi-phase voltage-control oscillator including a first voltage-control oscillator circuit and a second voltage-control oscillator circuit is provided. The first voltage-control oscillator circuit includes a first LC tank and a first inductor assembly unit. The second voltage-control oscillator circuit includes a second LC tank and a second inductor assembly unit. A mutual inductance effect is generated between the inductors of the first voltage-control oscillator and the inductors of the second voltage-control oscillator.
    Type: Grant
    Filed: December 28, 2006
    Date of Patent: June 23, 2009
    Assignee: National Taiwan University of Science and Technology
    Inventors: Sheng-Lyang Jang, Yun-Hsueh Chuang, Ren-Hong Yen, Shao-Hua Lee
  • Publication number: 20090102572
    Abstract: An inductor circuit includes a pair of inductors connected in parallel with each other and a switch for turning on and off electric power to one of the pair of inductors. The inductance of the inductor circuit can be varied and the quality factor Q can be improved. Further, RF circuits employing the inductor circuit can generate an intended operating frequency.
    Type: Application
    Filed: November 21, 2008
    Publication date: April 23, 2009
    Applicant: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Yun-seong EO, Hee-mun Bang, Kwang-du Lee, Heung-bae Lee
  • Publication number: 20090096557
    Abstract: Disclosed is a variable inductance applying device using a variable capacitor, and a variable frequency generating device thereof. The variable inductance applying device includes: a first inductor whose both terminals are connected to an inductance applying terminal applying inductance to an external circuit; a second inductor inductively coupled to the first inductor; and a variable capacitor connected to both terminals of the second inductor, which varies inductance from the inductance applying terminal by changing capacitance. Therefore, the inductance to be applied to the external circuit can be varied by changing the capacitance of the variable capacitor. Since the variable capacitor rarely contains a resistance component, energy loss due to the resistance component hardly occurs. As a result, the variable inductance applying device has a high value of Q.
    Type: Application
    Filed: December 12, 2008
    Publication date: April 16, 2009
    Inventors: Yun-seong Eo, Kwang-du Lee, Heung-bae Lee
  • Patent number: 7515006
    Abstract: An LC resonator (117; 122) for a voltage controlled oscillator (13; 116) has an inductive transmission line 31; 51), and input and output ports (33a-b; 53a-b) connected to the transmission line, wherein the transmission line is grounded (G) in at least one end portion thereof. The inductive transmission line has a plurality of connection ports (P) that are capable of being connected to each other or to ground in order to tune the resonance frequency of the LC resonator from one frequency band to another. Further, a trimming capacitor (C) may be interconnected in the transmission line in order to further tune the resonance frequency of the LC resonator. Preferably, the LC resonator is formed as a microstrip or strip line structure in essentially a C or S shape on a laminate substrate (101-103).
    Type: Grant
    Filed: May 31, 2007
    Date of Patent: April 7, 2009
    Assignee: Infineon Technologies AG
    Inventors: Reza Bagger, Richard Wallace, Tobias Hahn, Dante Palima
  • Patent number: 7511588
    Abstract: CMOS LC tank circuits and flux linkage between inductors can be used to distribute and propagate clock signals over the surface of a VLSI chip or processor. The tank circuit offers an adiabatic behavior that recycles the energy between the reactive elements and minimizes losses in a conventional sense. Flux linkage can be used to orchestrate a number of seemingly individual and distributed CMOS LC tank circuits to behave as one unit. In one example, the distribution of a 45° separated multi-phase balanced oscillations over the surface of die 1.6 cm×1.6 cm at 10 GHz is expected to dissipate under 10 W and offers a potential to significantly reduce the road map predictions of 100 W. Simulations of several CMOS tank circuits indicate that the power dissipation can be reduced an order of magnitude when compared to conventional techniques. A passive flux linkage, mechanical, and finite state machine technique of frequency adjustment of an oscillator are described.
    Type: Grant
    Filed: July 19, 2005
    Date of Patent: March 31, 2009
    Assignee: LCtank LLC
    Inventor: Thaddeus John Gabara
  • Patent number: 7508280
    Abstract: CMOS LC tank circuits and flux linkage between inductors can be used to distribute and propagate clock signals over the surface of a VLSI chip or ?processor. The tank circuit offers an adiabatic behavior that recycles the energy between the reactive elements and minimizes losses in a conventional sense. Flux linkage can be used to orchestrate a number of seemingly individual and distributed CMOS LC tank circuits to behave as one unit. Several frequency-adjusting techniques are presented which can be used in an distributed clock network environment which includes an array of oscillators. A passive flux linkage, mechanical, and finite state machine technique of frequency adjustment of oscillators are described.
    Type: Grant
    Filed: July 19, 2005
    Date of Patent: March 24, 2009
    Assignee: LC Tank LLC
    Inventor: Thaddeus John Gabara
  • Patent number: 7417511
    Abstract: A modulation circuit includes a microelectronic electromechanical system (MEMS) based resonant structure having a resonant frequency, an excitation input and an output. A control module is coupled to the excitation input of the MEMS based resonant structure. The control module modifies resonant characteristics of the MEMS based resonant structure to modulate the resonant frequency of the MEMS based resonant structure to produce a modulated signal at the output.
    Type: Grant
    Filed: December 13, 2004
    Date of Patent: August 26, 2008
    Assignee: Lexmark International, Inc.
    Inventor: Robert Allan Menke
  • Publication number: 20080180187
    Abstract: Methods and systems are provided for reducing circuit area. Some embodiments provide electronic devices including an inductor formed from a path having two ends that loops substantially in a plane around a center area, wherein the path crosses itself at least two points and wherein the path defines an outer boundary of the inductor; and a circuit that is located within the outer boundary of the inductor and substantially within or adjacent to the plane. Other embodiments provide electronic devices including an inductor formed from a path having two ends that loops substantially in a plane around a center area, wherein the path defines an outer boundary of the inductor; and a circuit that is located within the outer boundary of the inductor and substantially within or adjacent to the plane, and wherein the circuit comprises a signal path that is rake-shaped and crosses the path of the inductor at substantially perpendicular angles.
    Type: Application
    Filed: November 20, 2007
    Publication date: July 31, 2008
    Inventors: Peter R. KINGET, Frank ZHANG