With Common Output Patents (Class 327/294)
  • Patent number: 10367514
    Abstract: The present invention relates to passive phased injection locked circuit and ring-based voltage controlled oscillators. A passive phased injection locked circuit comprises first and second transmission lines, each has a plurality of discrete elements, that are operative to delay the phase of AC signal. Between the first and second transmission lines, a capacitor network is formed to advance the phases of the AC signal in concert along the transmission lines. For the ring-based voltage controlled oscillators, each of the first and second transmission lines has an odd number of discrete elements.
    Type: Grant
    Filed: May 22, 2015
    Date of Patent: July 30, 2019
    Assignee: Circuit Seed, LLC
    Inventors: Susan Marya Schober, Robert C. Schober, Herbert Shapiro
  • Patent number: 10193646
    Abstract: A true single-phase clocked multiplexer for outputting one of a plurality of input signals in synchronization with a clock signal and as selected by at least one select signal is provided. The multiplexer includes first transistors, second transistors, a first node between the first transistors, a second node between the second transistors, a third node coupled to the first node by one of the first transistors and to the second node by one of the second transistors, and a pre-charge transistor to couple the third node to a first voltage level. The first transistors are coupled to the first voltage level and configured to turn on in response to a gate voltage of a second voltage level different from the first voltage level. The second transistors are coupled to the second voltage level and configured to turn on in response to a gate voltage of the first voltage level.
    Type: Grant
    Filed: May 30, 2017
    Date of Patent: January 29, 2019
    Assignee: BAE Systems Information and Electronic Systems Integration Inc.
    Inventor: Steven E. Turner
  • Patent number: 9847338
    Abstract: A semiconductor storage device includes an insulating layer. A ferroelectric capacitor is on the insulating layer and includes a lower electrode, a ferroelectric film, and an upper electrode. An interlayer insulating film is formed on the insulating layer, and has an opening where the ferroelectric capacitor is disposed. A first metal plug is formed in the insulating layer and connected to the lower electrode via the opening. A second metal plug is embedded in the insulating layer outside the ferroelectric capacitor. A hydrogen barrier film covers the ferroelectric capacitor and the interlayer insulating film. An upper surface of the interlayer insulating film is higher than an upper surface of the first metal plug so that a step is therebetween. The lower electrode is formed on the upper surface of the interlayer insulating film, the upper surface of the first metal plug and the step.
    Type: Grant
    Filed: March 1, 2017
    Date of Patent: December 19, 2017
    Assignee: ROHM CO., LTD.
    Inventor: Yuichi Nakao
  • Patent number: 9811111
    Abstract: A clock generation system for an integrated circuit (IC) chip (e.g., a microcontroller) is disclosed that allows digital blocks and other components in the IC chip to start and stop internal clocks dynamically on demand to reduce power consumption.
    Type: Grant
    Filed: June 3, 2016
    Date of Patent: November 7, 2017
    Assignee: Atmel Corporation
    Inventors: Sebastien Jouin, Patrice Menard, Thierry Gourbilleau, Yann Le Floch, Mohamed Aichouchi
  • Patent number: 9618966
    Abstract: A pulse-drive resonant clock with on-the fly mode changing provides robust operation in a resonant clock distribution network, in particular for processor circuits having a dynamically-varied operating frequency. The clock drivers for the resonant clock distribution network include a pulse width control circuit having selectable operating modes corresponding to multiple clocking modes of the resonant clock distribution network. The pulse width control circuit includes a delay line that has a selectable delay length to provide pulse enable signals that control the pulse widths of the clock drivers in a sector of the resonant clock distribution network. The delay line responds to a mode control signal so that at least one pulse width of the output is changed from a first pulse width to a second pulse width without generating half-cycles with a pulse width narrower than the first or second pulse width.
    Type: Grant
    Filed: August 18, 2015
    Date of Patent: April 11, 2017
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Thomas J. Bucelot, Robert L. Franch, Phillip J. Restle, David Wen-Hao Shan, Christos Vezyrtzis
  • Patent number: 9484931
    Abstract: A delay locked loop (DLL) circuit may include: an input clock control unit suitable for transmitting first and second internal clocks generated based on an external clock, and controlling transmission of the second internal clock based on a clock control signal which is activated during a predetermined period; a clock delay unit suitable for generating a first delay locked clock by delaying the first internal clock by a delay time required for locking, and generating a second delay locked clock by delaying the second internal clock based on the clock control signal; and an output clock control unit suitable for outputting the first delay locked clock and the second delay locked clock during a period in which the clock control signal is activated.
    Type: Grant
    Filed: April 3, 2015
    Date of Patent: November 1, 2016
    Assignee: SK Hynix Inc.
    Inventors: Da-In Im, Young-Suk Seo
  • Patent number: 9000821
    Abstract: A delay circuit for receiving an input signal and generating a delayed output signal. The delay circuit includes a first delay module and a second delay module. The first delay module includes a first delay unit for generating a first delayed signal according to an input signal and a first logic unit, coupled to the first delay unit, for generating a first delayed output signal according to the first delayed signal and the input signal. The second delay module includes a second delay unit for generating a second delayed signal according to the first delayed output signal and a second logic unit, coupled to the second delay unit, for generating the delayed output signal according to the second delayed signal and the input signal.
    Type: Grant
    Filed: October 16, 2013
    Date of Patent: April 7, 2015
    Assignee: MStar Semiconductor, Inc.
    Inventors: Huimin Tsai, Yu-Min Yeh
  • Patent number: 8975936
    Abstract: An integrated circuit includes a plurality of resonant clock domains of a resonant clock network. Each resonant clock domain has at least one clock driver that supplies a portion of clock signal to an associated resonant clock domain. The resonant clock network operates in a resonant mode with inductors connected to pairs of resonant clock domains at boundaries between the resonant clock domains. Each inductor forms an LC circuit with clock load capacitance in the pair of resonant clock domains to which the inductor is connected.
    Type: Grant
    Filed: August 31, 2012
    Date of Patent: March 10, 2015
    Assignee: Advanced Micro Devices, Inc.
    Inventors: Visvesh S. Sathe, Samuel D. Naffziger
  • Patent number: 8933756
    Abstract: A generator of very short pulses where a cascade of inverters of arbitrary length characterized in that said inverters are adapted to produce pulses on their power supply line instead of their usual output.
    Type: Grant
    Filed: June 13, 2012
    Date of Patent: January 13, 2015
    Assignee: Ecole Polytechnique Federale de Lausanne (EPFL)
    Inventors: Edmund James Colli-Vignarelli, Catherine Dehollain, Jean-Yves Le Boudec
  • Patent number: 8890596
    Abstract: A clock signal generating apparatus includes a first frequency generating circuit, a second frequency generating circuit, and an output circuit. The first frequency generating circuit is arranged to generate a first clock signal having a first oscillation frequency. The second frequency generating circuit is arranged to generate a second clock signal having a second oscillation frequency. The output circuit is arranged to receive the first and second clock signals. The output circuit is able to output one of the first and second clock signals as an output clock signal according to an oscillation frequency control setting provided by an external bounding pad included within the clock signal generating apparatus.
    Type: Grant
    Filed: June 25, 2012
    Date of Patent: November 18, 2014
    Assignee: MediaTek Singapore Pte. Ltd.
    Inventor: Xiao-Fei Chen
  • Patent number: 8836403
    Abstract: A clock driver circuit supplies a clock signal with a drive strength determined according to one or more control signals supplied to the clock driver that vary during run-time. The clock driver is operated with a first drive strength in a non-resonant mode of operation of an associated clock network and with a second drive strength in a resonant mode of operation of the associated clock network, the first drive strength being higher than the second drive strength.
    Type: Grant
    Filed: August 31, 2012
    Date of Patent: September 16, 2014
    Assignee: Advanced Micro Devices, Inc.
    Inventors: Visvesh S. Sathe, Srikanth Arekapudi, Samuel D. Naffziger, Manivannan Bhoopathy
  • Patent number: 8779825
    Abstract: A delay element delays an output signal Dt from an arithmetic circuit and outputs a delayed signal Dd. An XOR element compares the output signal Dt with the delayed signal Dd, and outputs an XORout signal with the signal value “0” when the signals match each other, and outputs an XORout signal with the signal value “1” when the signals do not match each other. In a flip-flop, when the signal value of the XORout signal at the rise of a clock of a clock signal CK is “0”, the output signal Dt is output from a flip-flop, and when the signal value of the XORout signal at the rise of the clock becomes “1” even once, a fixed value of the signal value “0” continues to be output.
    Type: Grant
    Filed: July 6, 2011
    Date of Patent: July 15, 2014
    Assignee: Mitsubishi Electric Corporation
    Inventors: Tsuneo Sato, Teruyoshi Yamaguchi
  • Publication number: 20140176216
    Abstract: The invention relates to an integrated circuit comprising: a block comprising: first (38) and second (40) oppositely doped semiconductor wells; standard cells (42, 43) placed next to one another, each standard cell (42) comprising first transistors (60, 62), and a clock tree cell (30) encircled by standard cells, the clock tree cell (30) comprising: a third semiconductor well (104) having the same doping type as the doping of the first well (38); second transistors (100, 102); a semiconductor strip (106) extending continuously around the third well (104), and having the opposite doping type to the doping of the third well, so as to electrically isolate the third well (104) from the first well (38).
    Type: Application
    Filed: December 19, 2013
    Publication date: June 26, 2014
    Inventors: Yvain Thonnart, Bastien Giraud, Fady Abouzeid, Sylvain Clerc, Jean-Philippe Noel
  • Patent number: 8749290
    Abstract: A mobile communication device includes an analog clock and a digital clock circuit. The analog clock circuit is configured to generate an oscillating output. The digital clock circuit is configured to generate a digital clock output having a frequency that is substantially equal to the frequency of the oscillating output.
    Type: Grant
    Filed: December 12, 2012
    Date of Patent: June 10, 2014
    Assignee: BlackBerry Limited
    Inventors: Mark A. J. Carragher, John William Wynen
  • Publication number: 20140152484
    Abstract: An oversampling time-to-digital converter includes an input pulse generation circuit generating two pulse signals, a reference pulse generation circuit generating two pulse signals, a swap circuit swapping two pulse signals, a multiplexer selecting an output of the input pulse generation circuit or the swap circuit, a time-to-current conversion circuit outputting two pulse currents in accordance with an output of the multiplexer, a current mirror circuit whose input and output terminals receive the two pulse currents, an integration circuit integrating a differential current between the pulse current connected to the output terminal of the current mirror circuit and an output current of the current mirror circuit, and a comparison circuit comparing an output signal of the integration circuit to a threshold voltage. An output signal of the comparison circuit is given to the swap circuit as a control signal.
    Type: Application
    Filed: February 4, 2014
    Publication date: June 5, 2014
    Applicant: PANASONIC CORPORATION
    Inventors: Shiro DOSHO, Masao TAKAYAMA
  • Patent number: 8736309
    Abstract: A non-overlapping clock generator circuit supplies clock signals to a stage of a pipelined ADC, which includes parallel switched capacitor circuitry. The non-overlapping clock generator circuit includes: a first trigger generation circuit that generates first and second trigger signals; a second trigger generation circuit that generates third and fourth trigger signals; a first clock generation branch that receives the first, second and fourth trigger signals and generates first sampling cycle and delayed sampling cycle clock signals; a second clock generation branch that receives the first, second and third trigger signals and generates second sampling cycle and delayed sampling cycle clock signals; a third clock generation branch that receives the second trigger signal and generates first gain cycle and delayed gain cycle clock signals; and a fourth clock generation branch that receives the first trigger signal and generates second gain cycle and delayed gain cycle clock signals.
    Type: Grant
    Filed: May 24, 2012
    Date of Patent: May 27, 2014
    Assignee: Freescale Semiconductor, Inc.
    Inventor: Douglas A. Garrity
  • Patent number: 8704577
    Abstract: A clock mesh network synthesis method is proposed which enables clock gating on the local sub-trees of the clock mesh network in order to reduce the clock power dissipation. Clock gating is performed with a register clustering strategy that considers both i) the similarity of switching activities between registers in a local area and ii) the timing slack on every local data path of the design area. The method encapsulates the efficient implementation of the gated local trees and activity driven register clustering with timing slack awareness for clock mesh synthesis. With gated local tree and activity driven register clustering, the switching capacitance on the mesh network can be reduced by 22% with limited skew degradation. The method has two synthesis modes as low power mode and high performance mode to serve different design purposes.
    Type: Grant
    Filed: May 25, 2012
    Date of Patent: April 22, 2014
    Assignee: Drexel University
    Inventors: Baris Taskin, Jianchao Lu
  • Patent number: 8692586
    Abstract: An output circuit providing isolation between inputs and the output employs first and second opto-couplers for isolation. Pulse activation of the first opto-coupler turns on an output transistor and pulse activation of the second opto-coupler turns off the output transistor. An input stage of the output circuit is and light emitting devices of the first and second opto-couplers are powered by a first power source and an output stage of the output circuit is powered from an external power source. Power consumption by the input stage of output circuit occurs only during pulse activation of the first and second opto-couplers.
    Type: Grant
    Filed: September 10, 2012
    Date of Patent: April 8, 2014
    Assignee: Precision Digital Corporation
    Inventor: Wayne Shumaker
  • Publication number: 20140092892
    Abstract: A local oscillation generator includes a multi-phase circuit and a multiplexer. The multi-phase oscillator provides a plurality of multi-phase oscillation signals of a same frequency and different phases. The multiplexer conducts one of the multi-phase oscillation signals to an output end in different time slots to provide an output oscillation signal. The frequency of the multi-phase oscillation signals is the same as a fundamental frequency, and the frequency of the output oscillation signal is different from the fundamental frequency. Thus, the local oscillation generator provides a local oscillation signal according to the output oscillation signal such that the fundamental frequency is different from the frequency of the local oscillation signal.
    Type: Application
    Filed: September 27, 2013
    Publication date: April 3, 2014
    Applicant: MStar Semiconductor, Inc.
    Inventors: Chih-Ming Hung, Keng-Meng Chang, Yao-Chi Wang, Chih-Wei Chang
  • Patent number: 8680910
    Abstract: A method and apparatus for glitch-free switching of multiple phase clock have been disclosed where switching from one phase to another phase is done step-by-step to avoid generating a glitch.
    Type: Grant
    Filed: December 17, 2009
    Date of Patent: March 25, 2014
    Assignee: Integrated Device Technology, Inc.
    Inventors: Pengfei Hu, Liang Zhang
  • Publication number: 20140062562
    Abstract: An integrated circuit includes a plurality of resonant clock domains of a resonant clock network. Each resonant clock domain has at least one clock driver that supplies a portion of clock signal to an associated resonant clock domain. The resonant clock network operates in a resonant mode with inductors connected to pairs of resonant clock domains at boundaries between the resonant clock domains. Each inductor forms an LC circuit with clock load capacitance in the pair of resonant clock domains to which the inductor is connected.
    Type: Application
    Filed: August 31, 2012
    Publication date: March 6, 2014
    Inventors: Visvesh S. Sathe, Samuel D. Naffziger
  • Publication number: 20140062564
    Abstract: A clock driver circuit supplies a clock signal with a drive strength determined according to one or more control signals supplied to the clock driver that vary during run-time. The clock driver is operated with a first drive strength in a non-resonant mode of operation of an associated clock network and with a second drive strength in a resonant mode of operation of the associated clock network, the first drive strength being higher than the second drive strength.
    Type: Application
    Filed: August 31, 2012
    Publication date: March 6, 2014
    Inventors: Visvesh S. Sathe, Srikanth Arekapudi, Samuel D. Naffziger, Manivannan Bhoopathy
  • Publication number: 20140062565
    Abstract: A clock driver for a resonant clock network includes a delay circuit that receives and supplies a delayed clock signal. A first transistor is coupled to receive a first pulse control signal and supply an output clock node of the clock driver. An asserted edge of the first control signal is responsive to the falling edge of the delayed clock signal. A second transistor is coupled to receive a second control signal and to supply the output clock node of the clock driver. An asserted edge of the second control signal is responsive to a rising edge of the delayed clock signal.
    Type: Application
    Filed: August 31, 2012
    Publication date: March 6, 2014
    Inventors: Visvesh S. Sathe, Samuel D. Naffziger, Srikanth Arekapudi
  • Publication number: 20140062563
    Abstract: A clock system of an integrated circuit includes first and second transistors forming a switch that is used when switching the clock system between a resonant mode of operation and a non-resonant mode of operation. An inductor forms a resonant circuit with capacitance of the clock system in resonant mode. The switch receives a clock signal and supplies the clock signal to the inductor when the switch is closed and disconnects the inductor from the clock system when the switch is open. First and second high impedance voltage sources supply respective first and second voltages to the switch and a gate voltage of the first transistor transitions with the clock signal around the first voltage and a gate voltage of the second transistor transitions with the clock signal around the second voltage such that near constant overdrive voltages are maintained for the first and second transistors.
    Type: Application
    Filed: August 31, 2012
    Publication date: March 6, 2014
    Inventors: Visvesh S. Sathe, Samuel D. Naffziger
  • Patent number: 8659588
    Abstract: A display substrate includes a base substrate including a display area and a peripheral area, a pixel disposed on the display area, wherein the pixel includes; a pixel transistor connected to a gate line and a data line which cross each other, and a pixel electrode connected to the pixel transistor and the pixel electrode, and a gate driving circuit disposed on the peripheral area, wherein the gate driving circuit outputs a gate signal to the gate line and comprises a plurality of stages, an n-th stage of the gate driving circuit including a plurality of circuit transistors and a boosting capacitor including a first capacitor and a second capacitor, the plurality of circuit transistors and the first capacitor being disposed on a first area and the second capacitor being disposed on a second area of the peripheral area positioned between the first area and the display area.
    Type: Grant
    Filed: May 19, 2011
    Date of Patent: February 25, 2014
    Assignee: Samsung Display Co., Ltd.
    Inventor: Bon-Yong Koo
  • Patent number: 8638251
    Abstract: A continuous time delta-sigma modulator is provided that includes an integrator stage including a plurality of integrators; a quantizer to receive an input signal from the integrator stage and output a quantizer signal; a global feedback path providing feedback from the quantizer to the integrator stage; a local feedback path connecting the quantizer and a preceding integrator of the integrator stage configured to compensate for delay attributed to the global feedback path; and a delay compensation circuit. The delay compensation circuit is configured to calculate a delay value based on sources of additional delay within a local feedback loop, and to supply the additional delay value to the quantizer to compensate for delay within the local feedback loop.
    Type: Grant
    Filed: August 29, 2012
    Date of Patent: January 28, 2014
    Assignee: McAfee, Inc.
    Inventors: Merit Hong, James Riches
  • Patent number: 8618858
    Abstract: A pulse generator is provided. The pulse generator includes: a time delayed pulse generation unit including a plurality of delay cells for receiving a first pulse having a first pulse width and outputting pulses delayed by a particular time delay value on the basis of one of a rising edge and a falling edge of the first pulse; an edge combiner configured to receive the plurality of time delayed pulses from the time delayed pulse generation unit and generate second pulses having a second pulse width; and a channel selector configured to regulate the number of outputs of the second pulses generated by the edge combiner.
    Type: Grant
    Filed: December 2, 2011
    Date of Patent: December 31, 2013
    Assignees: Electronics and Telecommunications Research Institute, Unist Academy—Industry Corporation
    Inventors: Jae Hwan Kim, Hyung Soo Lee, Sang Sung Choi, Kyeong Deok Moon, Yun Ho Choi, Young Su Kim, Franklin Bien
  • Patent number: 8581653
    Abstract: An integrated circuit includes a local clock network that is operable to provide a first clock signal and an interface circuit that is coupled to receive the first clock signal from the local clock network. The interface circuit is operable to generate a second clock signal based on the first clock signal. A clock line is coupled to the interface circuit. The clock line has a fixed length. The second clock signal is provided to a multiplexer circuit through the clock line. The multiplexer circuit provides a third clock signal based on the second clock signal. Another clock network is coupled to receive the third clock signal from the multiplexer circuit.
    Type: Grant
    Filed: December 16, 2011
    Date of Patent: November 12, 2013
    Assignee: Altera Corporation
    Inventors: Victor Maruri, Arch Zaliznyak, Ramanand Venkata, Henry Y. Lui
  • Patent number: 8564354
    Abstract: Circuits and methods for latch-tracking pulse generation across process, voltage and temperature (PVT) variations are disclosed. In one embodiment, the method includes receiving a clock input at a pulse generation circuit and generating a pulse at the pulse generation circuit in response to the clock input. The method further includes distributing the pulse to a mimic latch, which writes a mimic storage node through a mimic storage circuit of the mimic latch in response to the pulse. The method further includes terminating generation of the pulse at the pulse generation circuit in response to a transition of the mimic storage node. The method may include receiving a clock enable input at a pulse control circuit coupled to the pulse generation circuit and either suppressing or allowing generation of a pulse in response to a value of the clock enable input.
    Type: Grant
    Filed: August 3, 2011
    Date of Patent: October 22, 2013
    Assignee: QUALCOMM Incorporated
    Inventor: Fadi Adel Hamdan
  • Patent number: 8546979
    Abstract: Pulse-generator circuits that permit independent control of pulse widths and the delays between successive pulses. In several embodiments, a pulse-generator subcircuit includes a transmission-line segment comprising first and second conductors, configured such that the first conductor is coupled to a first DC potential. The pulse-generator subcircuit further includes a terminating resistor coupled to a first end of the second conductor of the first transmission-line segment; this terminating resistor is matched to the characteristic impedance of the transmission-line segment. The pulse-generator subcircuit further includes first and second switches, controlled by first and second timing signals, respectively, and configured to selectively and independently connect respective first and second ends of the first conductor to a second DC potential.
    Type: Grant
    Filed: August 11, 2010
    Date of Patent: October 1, 2013
    Assignee: Alcon Research, Ltd.
    Inventors: Tammo Heeren, Fred Mercado
  • Patent number: 8461934
    Abstract: An IC includes first and second pads. The first pad is configured to receive an external clock. Alternatively, the first and second pads are configured to be coupled to a crystal oscillator and receive a reference clock. Alternatively, the second pad is configured to be grounded. The IC includes an internal oscillator for generating an internal clock, and an oscillator detector coupled to the second pad. The oscillator detector includes a transistor having a gate coupled to the second pad configured to pull a source-drain region to a first state if the second pad receives the reference clock or allow the source-drain region to be pulled to a second state if the second pad is grounded. The IC includes a buffer for transferring the first state to the internal oscillator for keeping the internal oscillator enabled and transferring the second state to the internal oscillator for disabling the internal oscillator.
    Type: Grant
    Filed: October 18, 2011
    Date of Patent: June 11, 2013
    Assignee: Marvell International Ltd.
    Inventors: Ovidiu Carnu, Xiaoyue Wang, Shafiq M. Jamal
  • Patent number: 8427219
    Abstract: The present invention is directed to a clock generator and a method of generating a clock signal. A digital control oscillator (DCO) generates a clock signal. A first frequency calibration unit extracts a periodic signal and determines a frequency error quantity between the extracted periodic signal and a derived clock signal. A second frequency calibration unit generates a coarse tuning signal when an absolute value of the frequency error quantity is greater than a first predetermined threshold, and generates a fine tuning signal when the absolute value of the frequency error quantity is less than a second predetermined threshold.
    Type: Grant
    Filed: December 5, 2011
    Date of Patent: April 23, 2013
    Assignee: Skymedi Corporation
    Inventors: Ching-Cheng Wu, Chih-Yu Chuang
  • Patent number: 8416003
    Abstract: A processor frequency adjustment circuit for adjusting a frequency of a processor includes a voltage converting module, a first reference voltage generating module, a clock chip, a voltage comparing module. The voltage converting module converts a pulse voltage into a constant voltage. The first reference voltage generating module generates a first reference voltage. The voltage comparing module is connected with the voltage converting module, the first reference voltage generating module, and the clock chip to compare the constant voltage with the first reference voltage, and generates a first voltage level signal to a first terminal of the clock chip; the clock chip adjusts the frequency of the processor in response to obtaining the first voltage level signal.
    Type: Grant
    Filed: September 13, 2011
    Date of Patent: April 9, 2013
    Assignees: Hong Fu Jin Precision Industry (ShenZhen) Co., Ltd., Hon Hai Precision Industry Co., Ltd.
    Inventors: Chun-Sheng Chen, Feng-Long He, Hua Zou
  • Patent number: 8354868
    Abstract: A mobile communication device includes an analog clock and a digital clock circuit. The analog clock circuit is configured to generate an oscillating output. The digital clock circuit is configured to generate a digital clock output having a frequency that is substantially equal to the frequency of the oscillating output.
    Type: Grant
    Filed: August 30, 2010
    Date of Patent: January 15, 2013
    Assignee: Research In Motion Limited
    Inventors: Mark A. J. Carragher, John William Wynen
  • 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: 8289195
    Abstract: A programmable logic device can be configured as a fractional rate resampling filter capable of performing downsampling prior to upsampling without modifying the overall filter response. Input data may be received at a first sample rate and may be downsampled to generate downsampled data. Portions of the downsampled data may be respectively output to different filtering paths. Each filtering path may include a cluster of filter components that corresponds to different subfilters of the overall filter response and may be operable to receive and process the different portions of the downsampled data. Outputs of each cluster may be combined to generate output data at a second sample rate. The resampling filter structure can reduce the number of multiplier circuits used by allowing time-division multiplexing among different filter components.
    Type: Grant
    Filed: March 25, 2011
    Date of Patent: October 16, 2012
    Assignee: Altera Corporation
    Inventors: Xiaofei Dong, Hong Shan Neoh
  • Patent number: 8289063
    Abstract: Disclosed herein is a digital system that includes a distribution network having a path to carry a reference clock and an adjustable delay element disposed along the path, and first and second clock domains coupled to the distribution network to receive the reference clock and configured to be driven by respective clock waveforms, each of which has a frequency in common with the reference clock. The digital system further includes a phase detector coupled to the first and second clock domains to generate a phase difference signal based on the clock waveforms, and a control circuit coupled to the phase detector and configured to adjust the adjustable delay element based on the phase difference signal.
    Type: Grant
    Filed: May 18, 2011
    Date of Patent: October 16, 2012
    Assignee: The Regents of the University of Michigan
    Inventors: Juang-Ying Chueh, Jerry Kao, Visvesh Sathe, Marios C. Papaefthymiou, Conrad Ziesler
  • Patent number: 8264267
    Abstract: A clock pulse generating circuit includes a pulse generator, a clock regulator, and a pre-driver. The pulse generator is configured to vary pulse widths of a rising clock signal and a falling clock signal. The clock regulator is configured to regulate output signals of the pulse generator to prevent an overlap and a duty drop of the output signals of the pulse generator. The pre-driver is configured to output data driving signals according to output signals of the clock regulator.
    Type: Grant
    Filed: December 29, 2009
    Date of Patent: September 11, 2012
    Assignee: Hynix Semiconductor Inc.
    Inventor: Hun Sam Jung
  • Patent number: 8242829
    Abstract: Methods, systems, and apparatus can provide a multichannel interpolator while optimizing circuitry reuse.
    Type: Grant
    Filed: June 24, 2010
    Date of Patent: August 14, 2012
    Assignee: ARRIS Group, Inc.
    Inventor: Oleksandr Volkov
  • Patent number: 8242814
    Abstract: A clock converting circuit (1) receives and then converts m-phase clocks of a frequency f having a phase difference of 1/(f×m) to n-phase clocks of the frequency f having a phase difference of 1/(f×n). A single-phase clock generating circuit (2) receives the n-phase clocks of the frequency f having a phase difference equivalent time of 1/(f×n) to generate single-phase clocks in synchronism with the rising or falling edges of the n-phase clocks. Since the frequency of the m-phase clocks inputted to the clock converting circuit (1) is ‘f’, if a desired frequency of the single-phase clocks is decided, then ‘n’ can be obtained from the equation: the frequency of the single-phase clocks is equal to (f×n). This value of ‘n’ is set to the clock converting circuit (1), thereby obtaining the n-phase clocks of the frequency f from the m-phase clocks of the frequency f to provide single-phase clocks of a desired frequency.
    Type: Grant
    Filed: September 16, 2005
    Date of Patent: August 14, 2012
    Assignee: NEC Corporation
    Inventors: Koichi Nose, Masayuki Mizuno, Atsufumi Shibayama
  • Patent number: 8228107
    Abstract: A method for balancing clock signals in an IC layout includes obtaining a data-flow information of the IC, selecting a first data-flow according to the dataflow information, and synchronizing a first clock signal from a first register and a second clock signal from a second register involved in the first data-flow. The data processed by the first register is directly transmitted to the second register or transmitted through a combinational logic circuit to the second register. The first data-flow is not related to other data-flows included in the data-flow information.
    Type: Grant
    Filed: October 5, 2010
    Date of Patent: July 24, 2012
    Assignee: Princeton Technology Corporation
    Inventor: De-Yu Kao
  • Patent number: 8183905
    Abstract: A method to provide a low-power clock signal or a low-noise clock signal is described herein. It is determined whether a low-power mode or a low-noise mode is in use. A voltage reference input of a low-dropout voltage regulator (LDO) is switched to a low-power voltage reference for low-power mode and to a low-noise voltage reference for low-noise mode. The LDO provides a constant voltage output to a crystal oscillator. A clock signal is generated using the crystal oscillator. The clock signal is limited using a low-power limiter to generate a low-power output clock signal and/or is limited using a low-noise limiter to generate a low-noise clock signal. The low-power output clock signal or the low-noise output clock signal is selected using a mux.
    Type: Grant
    Filed: August 11, 2009
    Date of Patent: May 22, 2012
    Assignee: Broadcom Corporation
    Inventors: Yuyu Chang, Qiang Li, John Leete, Hooman Darabi, Yiannis Kokolakis
  • Patent number: 8164374
    Abstract: Provided is a clock gating circuit which receives a first clock signal and controls an output of a second clock signal corresponding to the first clock signal in response to a control signal. The clock gating circuit includes: a first latch that latches a signal value of the control signal in synchronization with the first clock signal; an AND that receives the first clock signal and controls an output of the second clock signal in response to an output signal of the first latch; and a second latch that latches a signal value of the output signal of the first latch in synchronization with the first clock signal, and outputs a latched value. This enables execution of a scan test with a simple circuit configuration.
    Type: Grant
    Filed: August 4, 2009
    Date of Patent: April 24, 2012
    Assignee: Renesas Electronics Corporation
    Inventor: Kazuyuki Irie
  • Patent number: 8050119
    Abstract: A semiconductor memory device can output data according to a predetermined data output timing, in spite of a high frequency of system clock, even when a delay locked loop is disabled. The semiconductor memory device includes a delay locked loop configured to perform a delay locking operation on an internal clock to output delay locked clock, and a data output control unit configured to determine a data output timing, according to whether the delay locked loop is enabled or disabled, in response to a read command.
    Type: Grant
    Filed: June 30, 2008
    Date of Patent: November 1, 2011
    Assignee: Hynix Semiconductor Inc.
    Inventor: Ki-Chon Park
  • Patent number: 8026744
    Abstract: A clock signal switching device includes: a plurality of signal synchronization generation means for generating mask signals and synchronized switching signals; a plurality of clock signal mask means for generating masked clock signals; a synchronized switching signal selection means for selecting one from among the synchronized switching signals; and a masked clock signal selection means for selecting one from among the masked clock signals.
    Type: Grant
    Filed: August 23, 2010
    Date of Patent: September 27, 2011
    Assignee: Panasonic Corporation
    Inventors: Shinichi Hashimoto, Tadahiro Yoshida, Ryogo Yanagisawa
  • Patent number: 7999593
    Abstract: An electric circuit (30) for generating a clock-sampling signal (CLK) for a sampling device (31) comprises a clock generator (1, 40, 50, 60) for generating a plurality of clock signals (21-24, 51-54, 61-64), a correlation device (L) for correlating a characteristic signal section (LE) of a digital signal (DS) with the plurality of clock signals (21, 22, 23, 24, 51-56, 61-64), and a selecting device (MX) for selecting one of the clock signals (21, 22, 23, 24, 51-55, 61-64) as the clock-sampling signal (CLK) for the sampling device (31) on the basis of the correlation by the correlation device (L). The clock signals (21-24, 51-54, 61-64) have the same cycle duration (T) and are phase-shifted with respect to each other. The sampling device (31) subsequently samples the digital signal (DS) with the clock-sampling signal (CLK).
    Type: Grant
    Filed: December 6, 2006
    Date of Patent: August 16, 2011
    Assignee: NXP B.V.
    Inventors: Robert Spindler, Roland Brandl, Ewald Bergler
  • Patent number: 7996705
    Abstract: A multilevel input interface device connected to a signal bus including one or more data lines that transmit an M-level signal and a clock line that transmits a transmission clock signal indicating the timings of reading level information for the M-level signal, includes: a threshold value generation unit that produces a plurality of voltage outputs as a plurality of variable comparison reference signals according to the level-varying supply voltage; a level detection unit that compares, in synchronization with the transmission clock signal, the M-value level signal with the variable comparison reference signals and generates a logic output corresponding to an instantaneous value of the M-level signal; and a logic circuit unit that converts the logic output to a data signal.
    Type: Grant
    Filed: December 13, 2007
    Date of Patent: August 9, 2011
    Assignee: Seiko Epson Corporation
    Inventor: Kesatoshi Takeuchi
  • Patent number: 7977995
    Abstract: The described embodiments provide a circuit that can be configured as a pulse generator or as an oscillator. The circuit includes a pulse generator circuit and a test circuit that is coupled to the pulse generator circuit. In the described embodiments, an disable signal is coupled to the test circuit. When the disable signal is asserted, the test circuit is disabled, and the pulse generator circuit outputs pulses of a predetermined duration. In contrast, when the disable signal is deasserted, the test circuit is enabled, and the pulse generator circuit outputs an oscillating signal.
    Type: Grant
    Filed: June 30, 2009
    Date of Patent: July 12, 2011
    Assignee: Oracle America, Inc.
    Inventors: Robert P. Masleid, Anand Dixit
  • Publication number: 20110163785
    Abstract: An apparatus for interleaved phase shift clock synchronization includes a master clock generator and at least one slave clock generator. The master clock generator provides a ramp signal or reset signal for each slave clock generator to generate a clock synchronized with the clock of the master clock generator, and the master and slave clock generators have different reference voltages for generating clocks. Therefore, the clocks generated will be synchronized and interleaved phase with each other.
    Type: Application
    Filed: December 23, 2010
    Publication date: July 7, 2011
    Applicant: RICHTEK TECHNOLOGY CORP.
    Inventors: ISAAC Y. CHEN, AN-TUNG CHEN
  • Patent number: 7973584
    Abstract: Timing setting data include an arbitrary combination of a set timing signal indicating a positive edge timing and a reset timing signal indicating a negative edge timing. A sort unit sorts n pieces of the timing setting data in accordance with timing orders indicated by each of the timing setting data. With reference to the sorted timing setting data an open processor detects continuation of the set timing signals or continuation of the reset timing signals, and invalidates one of the continuous set timing signals or one of the continuous reset timing signals. An edge assigning unit sequentially assigns the set/reset timing signals remaining without being invalidated to, among the m variable delay circuits for setting/resetting, the variable delay circuits for setting/resetting in the ascending order of the frequencies of use thereof by then.
    Type: Grant
    Filed: September 4, 2008
    Date of Patent: July 5, 2011
    Assignee: Advantest Corporation
    Inventors: Nobuei Washizu, Hiroaki Tateno