Pulse Or Interrupted Continuous Wave Modulator Patents (Class 332/106)
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Patent number: 8289097Abstract: The invention provides a method and a modulation circuit for pulse width modulation with feedback, wherein a pulse width modulated signal is provided on the basis of an input signal and a reference signal that is periodic and has a reference frequency. The pulse width modulated signal is provided in that an output signal is switched from a first voltage level to a second voltage level in dependence on a comparison between the input signal and the reference signal at least once in every cycle of the reference signal, and in that at least once at a fixed moment in time in every cycle the pulse width modulated signal is switched from the second voltage level to the first voltage level. Furthermore, a periodic correction signal is added for compensation of the switching from the second voltage level to the first voltage level in the pulse width modulated signal.Type: GrantFiled: April 22, 2009Date of Patent: October 16, 2012Assignee: Hypex Electronics B.V.Inventor: Bruno Johan Georges Putzeys
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Patent number: 8284857Abstract: A communication system comprises a transmitter configured to binary data and a receiver configured to the data transmitted from the transmitter. The transmitter counts the number of bits of any one of binary value of a data section of the transmission data, and determines whether or not inversion processing should be performed in accordance with the counted number. When performing the inversion processing, the transmitter reverses each bit of the data section of the transmission data, adds inversion information showing that the bits have been reversed, and transmits the transmission data. The receiver receives the transmission data and determines whether or not inversion processing should be performed for the reception data, on the basis of the inversion information of the reception data. When performing the inversion processing, the receiver reverses each bit of the data section of the reception data.Type: GrantFiled: March 16, 2009Date of Patent: October 9, 2012Assignee: Kabushiki Kaisha ToshibaInventor: Masahiro Nozaki
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Patent number: 8238495Abstract: A method includes a main interference reduction mode for reducing the interference generated by a wideband device toward a narrowband device. The main interference reduction mode is performed within the wideband device and includes at least one of detecting an emission from and a reception performed by the narrowband device. A group of at least one sub-carrier having frequencies interfering with frequencies used by the narrowband device is determined from the detection step. The bits of the punctured stream that correspond to the information carried by the interfering sub-carriers of the group are determined and processed so that the processed bits are mapped into a reference symbol having an amplitude within a threshold of zero.Type: GrantFiled: June 26, 2006Date of Patent: August 7, 2012Assignee: STMicroelectronics SAInventor: Friedbert Berens
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Publication number: 20120194288Abstract: The invention is an electronic Two-Terminal Modulator. It is used electrically in series between a Power Source and a Target Device, and can modulate the power that is sent to the Target Device, at speeds and with modulating complexity that exceed present capability. The invention includes implementation of the modulator as a unit that is inserted into or appended to another device and is used to modulate the power in the other device.Type: ApplicationFiled: January 19, 2012Publication date: August 2, 2012Inventor: Barry M. Laxton
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Patent number: 8207503Abstract: A detector of periodic packets of X photons, each packet having a duration shorter than 0.1 nanosecond, comprising a sensor comprising a semiconductor element of type III-V biased in a negative differential resistance region, said sensor being arranged in a resonant cavity tuned to a multiple of the packet repetition frequency.Type: GrantFiled: August 13, 2009Date of Patent: June 26, 2012Assignee: European Synchrotron Radiation FacilityInventors: José Goulon, Gérard Goujon, Andrei Rogalev, Fabrice Wilhelm
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Patent number: 8164395Abstract: A signal modulator that can control transmission power if level adjustment of a continuous signal from an oscillator is executed is provided. A pulse generator of one example of a signal modulator includes an oscillator, a control signal generator, a multiplier, a filter, and a control section. The oscillator and the multiplier are active circuits formed of active elements. A continuous signal is output from the oscillator and is input to the multiplier and the multiplier intermittently operates by a control signal output from the control signal generator, whereby a pulse signal is generated and the power level is easily adjusted by a signal from the control section.Type: GrantFiled: December 25, 2008Date of Patent: April 24, 2012Assignee: Panasonic CorporationInventors: Shigeru Kobayashi, Michiaki Matsuo, Junji Sato
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Patent number: 8144761Abstract: A pulse transmission method for transmitting data by using pulse signals, each having a predetermined pulse width; defining a symbol time at least N times the predetermined pulse width, N being at least 2; defining a basic delay time calculated by dividing the predetermined pulse width by a predetermined integer; placing the pulse signals in the symbol time by delaying the pulse signals by an integral multiple of the basic delay time from start of the symbol time, the number of the pulse signals being k and 0?k?N being satisfied; and transmitting the pulse signals.Type: GrantFiled: September 26, 2008Date of Patent: March 27, 2012Assignee: Fujitsu LimitedInventor: Yasuhiro Nakasha
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Patent number: 8138825Abstract: A multi-chip stack structure and a signal transmission method are disclosed in specification and drawing, where the multi-chip stack structure includes first and second chips. The first chip includes a first inductance coil with a first series capacitor, and the second chip includes a second inductance coil with a second series capacitor. The first and second inductance coils are magnetically coupled to each other. The magnetically coupled inductance coils and the capacitors constitute a coupling filter.Type: GrantFiled: May 21, 2010Date of Patent: March 20, 2012Assignee: National Taiwan UniversityInventors: Hsin-Chia Lu, Guan-Ming Wu, Chun Pan
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Patent number: 8102202Abstract: A modem unit includes a first semiconductor die that includes a power management unit and an embedded flash memory. A mobile communication unit includes a modem unit residing on a first semiconductor die. The first semiconductor die also includes a power management unit and an embedded flash memory.Type: GrantFiled: August 12, 2008Date of Patent: January 24, 2012Assignee: Infineon Technologies AGInventor: Bernd Wurth
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Patent number: 8102937Abstract: A controller is configured to determine a word in a set of words corresponding to a received coding value, the set of words including at least one data word, at least one modulator command word and at least one gain command word. When the received coding value corresponds to a data word, the controller causes the data word to be modulated. When the received coding value corresponds to a modulator command word, the controller controls a modulator based on the modulator command word. When the received coding value corresponds to a gain command word, the controller controls a gain based on the gain command word.Type: GrantFiled: July 12, 2005Date of Patent: January 24, 2012Assignee: ST-Ericsson SAInventors: Markus Helfenstein, Harald Bauer, Peter Bode, Rainer Dietsch
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Patent number: 8054908Abstract: A transmitter circuit, which transmits data by using an impulse, has a variable delay circuit and a logic circuit. The variable delay circuit takes a clock as an input, and delays the clock in accordance with the data. The logic circuit takes the clock and an output of the variable delay circuit as inputs, and outputs an impulse by performing a logic operation between the clock and the output of the variable delay circuit.Type: GrantFiled: December 4, 2007Date of Patent: November 8, 2011Assignee: Fujitsu LimitedInventors: Yasuhiro Nakasha, Yoichi Kawano
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Patent number: 8031809Abstract: A template pulse generating circuit that generates a template pulse used for detection of a received pulse in pulse communication includes an output mode switching circuit for switching an output mode in accordance with a supplied control signal between a continuous output mode that continuously outputs the template pulses and an intermittent output mode that intermittently outputs the template pulses so that the template pulse is generated in either one of the continuous output mode and the intermittent output mode.Type: GrantFiled: February 27, 2008Date of Patent: October 4, 2011Assignee: Seiko Epson CorporationInventor: Izumi Iida
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Publication number: 20110221540Abstract: A pulse density modulation, PDM, driver, outputs a PDM stream and can be switched to a control token. The switch takes place when the first integral of the PDM stream has a magnitude less than or equal to a first predetermined value and the second integral of the PDM stream has a magnitude less than or equal to a second predetermined value.Type: ApplicationFiled: March 9, 2011Publication date: September 15, 2011Applicant: NXP B.V.Inventor: Lûtsen Ludgerus Albertus Hendrikus DOOPER
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Patent number: 7965150Abstract: It is an object of the present invention to shorten a time required until phases of output signals being output from two output terminals are inverted respectively from a start time of an oscillation in a differential oscillation apparatus.Type: GrantFiled: May 23, 2007Date of Patent: June 21, 2011Assignee: Panasonic CorporationInventors: Shigeru Kobayashi, Suguru Fujita
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Patent number: 7953182Abstract: Transmitters, receivers and associated methods are disclosed for providing phase and amplitude modulation in a carrier-less communication system (e.g., an ultra-wide band communication system). An approximate quadrature signal is provided by delaying the in-phase signal by an amount determined by various criteria, such as the bandwidths of the component signals, minimizing the mean square error between an approximate quadrature signal and the true quadrature signal, and minimizing the auto-correlation function of the in-phase signal.Type: GrantFiled: April 14, 2009Date of Patent: May 31, 2011Assignee: Ultrabit Communications LLCInventor: Stephan V. Schell
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Patent number: 7940861Abstract: The present invention relates to a method for reducing cycle slips in a carrier recovery loop for a phase detector, the method comprising the steps of receiving an input signal consisting of samples, each received sample having an in-phase (I) and quadrature-phase (Q) component, providing the input signal to a phase error estimator adapted to determine a phase error estimate, providing the phase error estimate to a loop filter, and forming an output signal from the carrier recovery loop by subtracting an output from the loop filter from the input signal, wherein the phase error estimate is determined based on a combination of the amplitude and phase of the samples and a probability measure for a specifically transmitted symbol, thereby improving phase tracking performance of the carrier recovery loop.Type: GrantFiled: December 7, 2007Date of Patent: May 10, 2011Assignee: Advantech Advanced Microwave Technologies, Inc.Inventor: Håkan Grenabo
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Patent number: 7911283Abstract: A low noise oscillator includes a resonator 102 that is excited with a pulsed signal (i.e., an impulse of energy) to replace energy lost to parasitic resistive losses once every Nth period (where N=1, 2, 3 . . . ). The resonating signal is monitored by a level detector and when the signal falls below a predetermined threshold, the pulse generator outputs a pulse or adjusts pulse width, pulse amplitude (or both) of a pulsed signal to create the necessary impulse for application to the resonator to recoup losses resulting from resonator operation. A phase shifting circuit may be provided to ensure the pulses are time aligned with the resonating signal to reduce noise.Type: GrantFiled: December 31, 2007Date of Patent: March 22, 2011Assignee: Nortel Networks LimitedInventors: Adrian J. Bergsma, Charles Nicholls
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Patent number: 7907664Abstract: Systems and method to compress digital video based on human factors expressed as a desirability score are provided. A particular method includes passing a digital input signal through a pulse-width modulator and passing an output of the pulse-width modulator through a power switching device. An output of the power switching device has a plurality of pulses. The method includes receiving the output of the power switching device at a first input of a comparator and receiving a reference voltage at a second input of the comparator. The method includes determining a net signal based on an output of the comparator and determining a timing error signal based on the net signal and the digital input signal. The method also includes adjusting the digital input signal to compensate for harmonic distortion based at least in part on the timing error signal.Type: GrantFiled: December 7, 2009Date of Patent: March 15, 2011Assignee: Sigmatel, Inc.Inventors: Zukui Song, Michael Determan
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Patent number: 7881402Abstract: A method for correcting gain imbalance error, phase imbalance error and DC offset errors in a transmitter having an OFDM-based I/Q modulator is disclosed. The method employs a compensator prior to the I/Q-modulator to compensate for the gain and phase imbalance and DC offset. The compensator is efficiently updated with the estimated values of gain and phase imbalance and DC offsets obtained by performing the DFT operation in the digital baseband domain while sending a pair of orthogonal test tones to the modulator's inputs from a digital baseband chip, then down converting the RF modulated signal through a nonlinear device and a bandpass filter to a baseband signal, and finally sampling it using an A/D. The delay mismatch, which is mainly generated by lowpass filters between the I and Q branches, is also minimized in this method.Type: GrantFiled: April 25, 2007Date of Patent: February 1, 2011Assignee: VIA Technologies, Inc.Inventors: Weig Gao, Didmin Shih
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Patent number: 7830218Abstract: A communications device includes a supply terminal which is able to be connected to a two-position-controlled power supply; a pulse width recording device, which is coupled to the supply terminal and which records a pulse width of current pulses that flow through the supply terminal, and a signal processing device which assigns a first logical level to a first recorded pulse width and a second logical level to a second recorded pulse width.Type: GrantFiled: August 17, 2007Date of Patent: November 9, 2010Assignee: Robert Bosch GmbHInventors: Karl-Heinz Schauer, Bernhard Mader, Ingo Pietsch, Timo Schmidt, Thomas Holst
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Patent number: 7830213Abstract: A signal generator, a signal generation method, and a communication system using the same are provided. The signal generator includes a plurality of nonlinear elements which are connected in a ring; and a signal distributor which is arranged in the ring to form a closed loop, feeds part of a signal to one of the plurality of the nonlinear elements, and outputs signal generated by one of the plurality of nonlinear elements. The method includes arranging a plurality of nonlinear elements connected in a ring; inputting a signal to one of the nonlinear elements; amplifying the signal; receiving the amplified signal and generating a harmonic component of a frequency; clipping the signal; and feeding part of the signal back to one of the nonlinear elements and outputting a remainder of the signal. The system includes a chaotic signal generator; a signal distributor; a modulator; and a transmission circuit.Type: GrantFiled: September 20, 2006Date of Patent: November 9, 2010Assignees: Samsung Electronics Co., Ltd., Institute of Radio Engineering and Electronics of RASInventors: Sang-Min Han, Seong-soo Lee, Young-hwan Kim, Alexander S. Dmitriev
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Publication number: 20100271148Abstract: A signal modulator that can control transmission power if level adjustment of a continuous signal from an oscillator is executed is provided. A pulse generator of one example of a signal modulator includes an oscillator, a control signal generator, a multiplier, a filter, and a control section. The oscillator and the multiplier are active circuits formed of active elements. A continuous signal is output from the oscillator and is input to the multiplier and the multiplier intermittently operates by a control signal output from the control signal generator, whereby a pulse signal is generated and the power level is easily adjusted by a signal from the control section.Type: ApplicationFiled: December 25, 2008Publication date: October 28, 2010Applicant: PANASONIC CORPORATIONInventors: Shigeru Kobayashi, Michiaki Matsuo, Junji Sato
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Patent number: 7809077Abstract: The invention relates to search and rescue service and can be used for debris active sounding. Said invention makes it possible to improve interference protection related to a temperature, the operator hands motion and trembling effecting the locator operation. The inventive method consists in forming an ultrabandwidth signal (UBW) according to a reference signal, in emitting the thus formed UBW signal to space, in receiving the UBW signal, in processing the UBW signal by correlating it with a reference UBW signal, wherein while processing the received UBW signal, the reference UBW signal is delayed for a time during which the initial position of a check point on a middle section between the maximum and minimum voltage of the correlated signal is set, in periodically monitoring the position of said check point and in modifying the space emission delay of the formed UBW signal when the check point position shifts from the initial position thereof, thereby resetting the check point position.Type: GrantFiled: September 26, 2005Date of Patent: October 5, 2010Assignees: Life Sensor Co., LtdInventors: Gairat Saidkhakimovich Ikramov, Aleksandr Vladimirovich Andriyanov, Sergei Vasilevich Kuramshev
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Patent number: 7804917Abstract: An ultra-wideband clear channel assessment system uses a double-window energy technique for energy detection, which indicates a clear or busy channel.Type: GrantFiled: September 14, 2006Date of Patent: September 28, 2010Assignee: Sigma Designs, Inc.Inventors: Catherine A. French, Ruoyang Lu, Hung C. Nguyen
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Patent number: 7764734Abstract: Digital pulse width modulation with variable period and error distribution that improves the tradeoff between resolution and clock speed in pulse width modulation circuits so that a higher resolution can be achieved with a lower clock speed. A preferred method includes, for a signal sample S and each value of P in a range Pmin to Pmax of pulse periods P, determining a pulse width V=round(P*S), where round(P*S) is the closest integer value of P*S, and the magnitude of the error |E|=|S?V/P|, for the value of V (Vopt) and P (Popt) associated with the lowest value of the magnitude of the error |E|, providing an output pulse of a pulse width Vopt during the pulse period Popt, and successively repeating a) and b). Other aspects of the invention may include error distribution, error squelching to prevent idle-tone, idle-noise artifacts, 2-samples-per-pulse and non-uniform sampling and pulsing. Other features are disclosed.Type: GrantFiled: October 31, 2006Date of Patent: July 27, 2010Assignee: Winbond Electronics CorporationInventor: Samuel Chi Hong Yau
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Patent number: 7729441Abstract: A method for generating a modulated carrier signal with reduced bit error rates based on a plurality of data symbols. A plurality of data symbols are received, and a digital input signal is generated based on the plurality of data symbols. The digital input signal are filtered to produce a digital output signal including a phase characteristic. The phase characteristic of the digital output signal remains close to the desired symbol phase for substantial portion of the symbol period. A carrier signal is modulated using the digital output signal to produce the modulated carrier signal.Type: GrantFiled: September 5, 2006Date of Patent: June 1, 2010Assignee: Pine Valley Investments, Inc.Inventor: Richard Duane Taylor
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Patent number: 7710213Abstract: A circuit for voltage limitation is provided in a transponder with a resonant circuit, which comprises at least one inductor, a capacitor, a depletion layer component with an input, output, and a control input, a first resonant circuit terminal, which is connected to the input of the depletion layer element, and a second resonant circuit terminal, which is connected to the output of the depletion layer element, whereby there is a connection between the control input of the depletion layer component and the first resonant circuit terminal and the second resonant circuit terminal. A method for voltage limitation in a transponder is provided, whereby for voltage limitation in the transmitting and receiving resonant circuit, the control terminal of the depletion layer element is driven by the voltage of the first and second resonant circuit terminal.Type: GrantFiled: February 15, 2007Date of Patent: May 4, 2010Assignee: Atmel Automotive GmbHInventors: Martin Berhorst, Alexander Kurz, Peter Schneider
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Publication number: 20100074368Abstract: An asynchronous delta-sigma modulator is proposed that comprises an input port, a filter, an envelope path, a phase path, an amplifier, and a feedback path that conveys the amplifier output signal to the filter. The envelope path extracts an envelope from the signal provided by the filter and issues an envelope signal. The phase path processes or processes a phase from the signal provided by the filter and issues a phase signal. The amplifier comprises input ports for the envelope signal and the phase signal. The amplifier issues an amplifier output signal based on said envelope signal and said phase signal. The feedback path conveys the amplifier output signal to the filter. The feedback signal contains both amplitude information and phase information. A corresponding method and computer-program products usable for production and operation of the delta-sigma modulator are also disclosed.Type: ApplicationFiled: September 24, 2009Publication date: March 25, 2010Inventors: Udo Karthaus, Horst Wagner
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Patent number: 7684497Abstract: To reflect advantages of a constant phase modulation waveform, the invention provides a pulse amplitude modulated PAM waveform that is a superposition of Q0?2L?1 PAM component pulses in each symbol interval such that a significant portion of signal energy over each symbol interval is within the Q0 PAM component pulses. The present invention distributes most signal energy in one pulse and progressively lower energies in the remaining Q0?1 pulses of a symbol interval. The Laurent Decomposition is a special case of the present invention, but the present invention exhibits the energy distribution of the Laurent Decomposition in non-binary CPM waveforms and in multi-h (binary and non-binary) CPM waveforms, where h is a modulating index. All energy is distributed among only Q=2L?1 pulses in each symbol interval, though only Q0<Q pulses may in fact be transmitted in certain embodiments. A method, transmitter, receiver, and computer program are disclosed.Type: GrantFiled: June 30, 2005Date of Patent: March 23, 2010Assignee: Nokia CorporationInventor: Marilynn P. Green
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Patent number: 7667552Abstract: A system is described for generating a discrete noise-shaped variable switching frequency signal that may be used to define a digital pulse width modulation (“PWM”) period. The system may define a switching frequency waveform that may be used to generate a current switching frequency signal as a function of a system clock. The system may quantize the current switching frequency signal to generate a discrete switching frequency signal that is realizable with the system clock. The system may detect quantization noise and input the noise into the current switching frequency signal to eliminate or reduce discrete tones at the switching frequencies of a PWM signal spectrum.Type: GrantFiled: April 10, 2007Date of Patent: February 23, 2010Assignee: Freescale Semiconductor, Inc.Inventors: Pallab Midya, Xin Geng
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Patent number: 7653148Abstract: A method and apparatus for modulating an input signal comprised of an ordered series of samples separated by a substantially constant period T comprising the steps of providing a carrier signal, the carrier signal comprised of a series of samples separated by a substantially constant period T, wherein one of the carrier samples corresponds to each of the input signal samples, selecting a plurality of N successive samples from the series of input signal samples, the series of samples having an input order, for each of the N selected samples in parallel, multiplying the selected sample by the corresponding carrier sample and recombining the N multiplied samples while maintaining the input order.Type: GrantFiled: January 28, 2009Date of Patent: January 26, 2010Assignee: Liquid Xstream Systems Inc.Inventors: Jean-Francis Kisovec, Benoit Dufresne
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Patent number: 7606323Abstract: A transmitter circuit has two mixers that modulate a carrier wave according to an input signal, outputs a signal having information in a phase and an amplitude, detects a DC offset in each of the mixers, and adds a DC voltage that corrects the detected DC offset to the input signal of the mixers. The mixer is a double balanced mixer having two load resistors, and the transmitter circuit has a resistor that is connected between a node of two load resistors and a power supply, a limiter amplifier that amplifies a signal, and a control unit that changes first and second potentials using a signal that is outputted by the limiter amplifier. The first and second potentials become a potential of the DC voltage that corrects the DC offset.Type: GrantFiled: January 19, 2006Date of Patent: October 20, 2009Assignee: Renesas Technology Corp.Inventors: Satoshi Tanaka, Yukinori Akamine
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Publication number: 20090168919Abstract: Provided is a pulse modulation circuit capable of generating a pulse modulation signal with a steep rise and a desired pulse width at a desired timing not depending on a transmission signal sequence. In this circuit, a control signal generation unit (110) generates a first control signal if transmission data (S11) is “1” and a second control signal if the transmission data (S11) is “0.” The control signal generation unit (110) controls an oscillator (1200) of an intermittently operating circuit (120) to be at an oscillation state for outputting a desired first oscillation signal while the first control signal is turned ON and controls the oscillator (1200) to be at an idling state for outputting a second oscillation signal having a lower amplitude than the first oscillation signal while the second control signal is turned ON.Type: ApplicationFiled: June 19, 2007Publication date: July 2, 2009Inventors: Junji Sato, Shigeru Kobayashi, Suguru Fujita
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Patent number: 7539267Abstract: A method signals in an ultra-wide bandwidth network. A data symbol is generated. A set of reference pulses is transmitted for the data symbol. Each reference pulse is of a different type. One data pulse is also transmitted for each reference pulse. A type of each data pulse is identical to the type of the corresponding reference pulse.Type: GrantFiled: August 20, 2004Date of Patent: May 26, 2009Assignee: Mitsubishi Electric Research Laboratories, Inc.Inventors: Zafer Sahinoglu, Sinan Gezici
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Patent number: 7539257Abstract: A signal generator generates a coded or memory waveform having a trellis structure. A modulator is operative with the signal generator for adding at least one phase pulse to the trellis structure of the coded or memory waveform to create a substantially constant envelope modulated signal that increases the transmitted bits per symbol.Type: GrantFiled: November 5, 2004Date of Patent: May 26, 2009Assignee: Harris CorporationInventors: James A. Norris, John W. Nieto
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Patent number: 7532682Abstract: Transmitters, receivers and associated methods are disclosed for providing phase and amplitude modulation in a carrier-less communication system (e.g., an ultra-wide band communication system). An approximate quadrature signal is provided by delaying the in-phase signal by an amount determined by various criteria, such as the bandwidths of the component signals, minimizing the mean square error between an approximate quadrature signal and the true quadrature signal, and minimizing the auto-correlation function of the in-phase signal.Type: GrantFiled: November 27, 2002Date of Patent: May 12, 2009Inventor: Stephan V. Schell
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Patent number: 7529300Abstract: Shaped Offset Quadrature Amplitude Modulation (QAM) can be implemented within a communication system. A train or sequence of orthogonal sinc pulses can be generated for each of the in-phase and quadrature signal paths. The sinc pulses in the quadrature signal path can have a predetermined time offset relative to the pulses in the in-phase signal path. An in-phase or quadrature antipodal data signal can be used to modulate the respective sinc pulse train. Each of the in-phase and quadrature pulses can be shaped using a time domain windowing function, such as a Kaiser-Bessel window, to adjust the spectral width and spectral sidelobe level of the signal. The beta parameter of the window can be adjusted to achieve the desired signal response. The timing of the sinc pulses may need to be adjusted following the window function in order to maintain orthogonality of the pulses.Type: GrantFiled: July 26, 2005Date of Patent: May 5, 2009Assignee: Cubic CorporationInventor: Wayne Edward Richards
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Patent number: 7512192Abstract: A phase conjugation vectoring (PCV) of signals propagating in telephone cables of twisted pairs provides crosstalk free transmission therethrough. The cable is considered a non-uniform physical media, and criteria for phase conjugation of electromagnetic fields are established. Method and system provide PCV for both asymmetric and symmetric transmission.Type: GrantFiled: February 10, 2004Date of Patent: March 31, 2009Inventor: Ilya M. Fishman
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Patent number: 7512193Abstract: A circuit for pre-emphasis in data serialization. The circuit has a signal delayline to incrementally delay a serialized signal, producing a delayed serialized signal. The circuit has a one bit generator circuit, which determines the interval between receipt of one bit and a second bit. The one bit generator circuit has a strobe delayline to incrementally delay a strobe signal, producing a delayed strobe signal, a logical gate to compare the delayed strobe signal with a second strobe signal, and a logical component to determine how long the delayed strobe signal was delayed before it matched the second strobe signal. The circuit also has a comparison gate to detect transition points in the serialized signal by comparing the delayed serialized signal with the serialized signal. The circuit also has a current source to provide increased current for the serialized signal at the detected transition points.Type: GrantFiled: May 2, 2005Date of Patent: March 31, 2009Assignee: National Semiconductor CorporationInventors: Peter Shing, Min Du, Xin Liu, Qingping Zheng
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Patent number: 7498978Abstract: A device for generating high powered Radio Frequency (RF) or microwave signals comprising a fast rise-time video pulse generator, a modulator to modify the generated UWB pulses by gyromagnetic action to transfer a portion of the UWB pulse energy from lower frequencies to frequencies in the RF or microwave range thereby producing a resultant RF or microwave waveform that can be radiated.Type: GrantFiled: October 30, 2003Date of Patent: March 3, 2009Assignee: BAE Systems plcInventors: Nigel Seddon, John E Dolan
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Patent number: 7496151Abstract: Data from the orthogonal data generator is quantized by the vector data converter to become, for example, a binary value of 0 and a real number in magnitude. The output of the vector converter is modulated by the modulator, and is inputted to the amplifier. In the amplifier, the envelope of the signal to be inputted is quantized. That is, the signal of a constant envelope becomes a signal which is turned ON and OFF, so that a highly efficient nonlinear amplifier can be used. The filter removes the quantization noise generated in the vector data converter and then the signal of a low distortion and a low noise is outputted from the output terminal. The isolation unit is connected between the amplifier and the filter, avoiding effects on the output impedance of the amplifier from the filter, so that a signal of a low distortion can be outputted.Type: GrantFiled: March 4, 2005Date of Patent: February 24, 2009Assignee: Panasonic CorporationInventors: Toru Matsuura, Hisashi Adachi
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Patent number: 7486155Abstract: A pulse width modulator circuit has two self-oscillating pulse width modulators and a synchronization circuit for synchronizing the two self-oscillating pulse width modulators. It also comprises an auxiliary-signal generating circuit for generating an auxiliary signal which is coupled into the two self-oscillating pulse width modulators.Type: GrantFiled: June 8, 2007Date of Patent: February 3, 2009Assignee: Infineon Technologies AGInventors: Martin Clara, Andreas Wiesbauer, Thomas Poetscher, David San Segundo Bello, Sergio Walter
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Patent number: 7463698Abstract: A transmitter has a peak reducing part carrying out peak reduction processing; an OFDM signal generating part generating an OFDM signal from an input information signal; a cyclic shifting part generating a signal obtained from cyclically shifting the OFDM signal; and an adding part adding the OFDM signal and the cyclically shifted signal together.Type: GrantFiled: May 18, 2005Date of Patent: December 9, 2008Assignee: NTT DoCoMo, Inc.Inventors: Hiromasa Fujii, Jiyun Shen, Takahiro Asai, Hirohito Suda
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Patent number: 7427903Abstract: A polar modulator has a low AM-AM and AM-PM distortion comprises a phase locked loop. The phase locked loop is designed for outputting a high-frequency signal with a frequency derived from a phase modulation signal at an actuating input of the phase locked loop. A filter device, for suppressing a DC signal component, is coupled to an output of the phase locked loop. Furthermore, provision is made of a controllable voltage source with a control input suitable for feeding in an amplitude modulation signal. A push-pull amplifier is connected by an input to the filter device. It comprises two feedback amplifier transistors connected in series, which are connected to a voltage output of the controllable voltage source for supply purposes. Control terminals of the amplifier transistors are connected to the input and, via a load, to an output of the push-pull amplifier.Type: GrantFiled: November 22, 2005Date of Patent: September 23, 2008Assignee: Infineon Technologies AGInventor: Giuseppe Li Puma
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Patent number: 7426372Abstract: An apparatus and method for amplifying a radio frequency signal including, generating a plurality of shaped pulses utilizing a piecewise linearizer circuit, applying the plurality of shaped pulses to a first input of a radio frequency amplifier circuit, and injecting a radio frequency carrier into a second input of the radio frequency amplifier circuit. The apparatus comprises a piecewise linearizer (PWL) circuit coupled to the input of a Radio Frequency Digital to Analog Converter (RFDAC) operating as a signal amplifier.Type: GrantFiled: March 31, 2005Date of Patent: September 16, 2008Assignee: M/A-COM Eurotec B.V.Inventor: Gerard T. Quilligan
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Publication number: 20080136691Abstract: An apparatus and method are described to increase the control resolution of an electronic device. In one embodiment, the invention includes a spread pulse modulation module to generate a first set of bits based on a second set of bits that is larger than the first set of bits. The spread pulse modulation module modulates the least significant bit (LSB) of the first set of bits based on information including the LSB modulation period and the LSB modulation duty cycle. The spread pulse modulation module also modulates the least significant bit of the first set of bits so that the least significant bit transitions at least twice from a high value to a low value during the modulation period. This embodiment of the invention also includes a digital-to-analog conversion module to generate an analog input signal to the electronic device based on the first set of bits.Type: ApplicationFiled: August 22, 2007Publication date: June 12, 2008Applicant: BRILLIANT TELECOMMUNICATIONS, INC.Inventors: Charles F. BARRY, Tian SHEN, Reed A. PARKER, Feng F. PAN, Meenakshi SUBRAMANIAN
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Patent number: 7362819Abstract: A method of limiting at least one peak of a composite signal having multiple carriers signals involves placing energy in at least one bandwidth gap located between respective frequency bandwidths of carrier signals.Type: GrantFiled: June 16, 2004Date of Patent: April 22, 2008Assignee: Lucent Technologies Inc.Inventors: Frank Gerhard Ernst Obernosterer, Kumud Kumar Sanwal
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Patent number: 7301417Abstract: Disclosed is a pulse width modulation method and apparatus capable of expressing as many values as possible in a pulse width modulation (PWM) period, while maintaining the center of pulse energy substantially equal to the center of the PWM period. For this end, prepared is the PWM pattern generator 20 including 2 kinds of PWM pulse generator 21 and 22 for generating pulses having the pulse width of 0˜N times of the reference clock period in 1 PWM period corresponding to a predetermined number N of the reference clock period. The PWM pulse generators 21 and 22 are properly switched by the switching circuit 30 under control of the control circuit 40 for performing time averaging process so that the centers of energy of the output pulses is substantially equal to the center of the PWM period.Type: GrantFiled: March 22, 2005Date of Patent: November 27, 2007Assignee: Digian Technology, Inc.Inventor: Yoshiaki Shinohara
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Patent number: 7283012Abstract: A tri-state pulse density modulator includes a first switch device coupled to a high voltage, and a second switch device coupled to a low voltage. An adder receives a pulse density modulation (PDM) input signal and a latched input signal to generate an output sum signal and a carry signal. A latch module coupled with the adder latches the output sum signal with a clock signal to generate the latched input signal. A control circuit module responsive to the carry signal for selectively turns off the first and second switch devices to generate the PDM output signal at a tri-state voltage between the first and second voltages, or turns on the first or second switch device to generate the PDM output signal at the first or second voltage, respectively. Thus, the PDM output signal only switches between the tri-state voltage and either the first voltage or the second voltage.Type: GrantFiled: April 15, 2005Date of Patent: October 16, 2007Assignee: Via Telecom., Ltd.Inventor: Meoung-Jin Lim
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Patent number: 7283011Abstract: A modulation method, referred to as dual phase pulse modulation (DPPM), represents digital data as a series of high and low pulses whose widths represent groups of M data bits, with both the high and low pulses representing successive M-bit groups. Each of the 2M possible data values for a group of M data bits uniquely corresponds to one of 2M distinct pulse widths. This modulation method is essentially clockless, with data being decoded from a signal by detecting each pulse's width with respect to the last transition. Power consumption is reduced by having M data bits represented for each pulse transition, and by using both the high and low pulses to represent data.Type: GrantFiled: April 29, 2004Date of Patent: October 16, 2007Assignee: Atmel CorporationInventors: Daniel S. Cohen, Daniel J. Meyer, John L. Fagan