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| Number | Title | Issue Date |
| 8188804 | System and method of shaping a power spectrum in PWM amplifiers In a particular embodiment, a circuit device is disclosed that includes a data generator adapted to output a random pulse sequence having a particular spectral shape. The circuit device further includes a pulse edge control circuit to selectively apply a carrier sup... | 05/29/2012 |
| 8164395 | Signal modulator 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 f... | 04/24/2012 |
| 8154358 | System and method of changing a PWM power spectrum In a particular embodiment, a circuit device includes a pulse edge control circuit to receive at least one pulse-width modulated (PWM) signal from a PWM source. The pulse edge control circuit is adapted to selectively invert and swap the at least one PWM signal with... | 04/10/2012 |
| 7940141 | PWM signal generation circuit, class-D amplifier and method for driving the same A first situation indicating that the system is in a power-on situation or an un-mute situation, or a second situation indicating that the system is in a power-off situation or in a mute situation, is detected. When the first situation is detected, a differential PW... | 05/10/2011 |
| 7724105 | System and method of shaping a power spectrum in PWM amplifiers In a particular embodiment, a circuit device is disclosed that includes a data generator adapted to output a random pulse sequence having a particular spectral shape. The circuit device further includes a pulse edge control circuit to selectively apply a carrier sup... | 05/25/2010 |
| 7701308 | Radio frequency modulator A radio frequency modulator system having a radio frequency amplifier controlled by a pulse modulator. The pulse modulator includes: a first switching circuit response to an input pulse for coupling a dc voltage relative to a reference potential to the output electr... | 04/20/2010 |
| 7701307 | System and method of changing a PWM power spectrum In a particular embodiment, a circuit device includes a pulse edge control circuit to receive at least one pulse-width modulated (PWM) signal from a PWM source. The pulse edge control circuit is adapted to selectively invert and swap the at least one PWM signal with... | 04/20/2010 |
| 7362819 | Device and method for reducing peaks of a composite signal 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. ... | 04/22/2008 |
| 7327202 | Optimization for an IQ modulator An IQ modulator's performance is optimized through determination of suitable control parameters by the application of known DC biases as the I and Q inputs. Also known are the relative amplitude and actual phase of the sine and cosine carriers to be modulated before... | 02/05/2008 |
| 7263136 | Predistortion modulator A device for predistorting a digital symbol for modulating an RF signal includes a multi-bit buffer connected to an input serial bit stream and providing a parallel bit stream from the input serial bit stream; and a processing module connected to the input parallel ... | 08/28/2007 |
| 7250815 | Amplifier distortion management apparatus, systems, and methods An apparatus and a system, as well as a method and an article, may include detecting an indication of an amplifier output signal amplitude and responsively adjusting the amplifier input signal phase to reduce a change in the phase of the output signal. ... | 07/31/2007 |
| 7248644 | Circuit and method for compensating for nonliner distortion of power amplifier A nonlinear distortion compensating circuit for compensating for a nonlinear distortion caused by a power amplifier for amplifying an input signal has a power calculator for calculating a power value of the input signal, an operating point setting unit for calculati... | 07/24/2007 |
| 7184491 | Wireless communication apparatus A linear system and an EER system are used in combination such that the EER system can also be used in a cellular phone with a wide output dynamic range. In the EER system, linear control of an amplifier becomes difficult in a low output range. Thus, use of the EER ... | 02/27/2007 |
| 7180439 | Multi-path digital power supply controller A multi-path digital power supply controller includes a first ADC (ADC1) coupled to the supply's output voltage Vout and arranged to provide an output which varies with Vout's low frequency components, and a second ADC (ADC2) coupled to Vo... | 02/20/2007 |
| 7158580 | Data pulse spectrum control The present invention reduces adjacent channel interference for a wireless peripheral device. A direct digital synthesizer generates a waveform having intermediate angular changes during a transition time between symbol intervals. After the transition time, the dire... | 01/02/2007 |
| 7154923 | Method and apparatus for providing a modulation current Techniques are disclosed for providing modulation current that includes output impedance compensation with a feed-forward bandwidth enhancement and pre-distortion modulation to control waveform transition symmetry. A feedback circuit senses output node voltage and i... | 12/26/2006 |
| 7142819 | Circuits and methods for controlling switching noise in switched-mode circuits A method of controlling noise in a pulse width modulation circuit includes varying a sample frequency and a range of information levels, wherein each sample within a data sample stream at the sample frequency represents a level within the range of information levels... | 11/28/2006 |
| 7116916 | Method and apparatus for compacting data in a communication network A pulse width of a pulse having a nominal pulse width is modulated in accordance with a digital value to be communicated. The number of clock cycles that the modulated pulse width exceeds the nominal pulse width is counted. Various embodiments use a counter to deter... | 10/03/2006 |
| 7078964 | Detection of DC output levels from a class D amplifier A class AD audio amplifier system (10) with DC output detection logic (26) is disclosed. The amplifier system (10) includes multiple audio channels (20), each of which includes a pulse-width-modulator (PWM) (24). The DC detection l... | 07/18/2006 |
| 7046738 | 8-PSK transmit filtering using reduced look up tables A method for generating a premodulation-filtered modulation waveform having a real part and an imaginary part for transmitting octal symbols uses a reduced lookup table. Successive octal symbols, each comprising three information bits, are input to a logic unit. The... | 05/16/2006 |
| 7023267 | Switching power amplifier using a frequency translating delta sigma modulator A radio frequency (RF) switching power amplifier comprises: a switching amplifier 203 to provide an amplified signal within an RF band; and a delta signal modulator (DSM) 207 that is operable; to control the switching amplifier in a feedback configurat... | 04/04/2006 |
| 6977546 | High efficiency power amplifier systems and methods A high efficiency, low distortion switching mode power amplifier for telecommunication applications includes an analog to binary digital converter and a class S amplifier terminated by an output filter/matching network capable of operation over one or more frequency... | 12/20/2005 |
| 6975177 | Method and system for a generation of a two-level signal In a modulation system, in order to provide a two-level signal with a desired modulation which is suited to be amplified by a switching mode power amplifier, the modulation system may include a first constant envelope modulator modulating a signal according to a fir... | 12/13/2005 |
| 6970052 | Modulator immune from temperature variation-induced change in modulation factor A modulation factor is kept immune from the influence of temperature variation. A modulator is provided with an operational amplifier to one of whose input ends are inputted video signals and to the other is applied a reference voltage and a video mixer into which a... | 11/29/2005 |
| 6943640 | Current source modulator A current source modulator (202; 302, 502) provides power to radar transmitters. The modulator comprises a power supply (210, 310, 510) providing, when enabled, a known current to a storage capacitor (145). A comparator circuit (220) prov... | 09/13/2005 |
| 6937090 | Charge injection reduction technique in single and multi-reference switching amplifiers A method of adding a minimum pulse width to the switching devices of both outputs of a switching differential pair enhances the performance of a switching amplifier. When used with similar switching devices at similar temperatures, this results in injecting a simila... | 08/30/2005 |
| 6930563 | Self-adjusting I-Q modulator system An improved self-adjusting I-Q modulator system has a quadrature modulated carrier output that is input to a waveform acquisition circuit for obtaining a full waveform from which both amplitude and phase measurements are obtained. Calibration occurs by setting respe... | 08/16/2005 |
| 6919771 | Digital amplifier An object of the present invention is to provide a digital amplifier which is capable of preventing a reproduction of an analogue audio signal from a loud speaker, when an output sound volume from the loud speaker is set to zero and when inputting of a digital audio... | 07/19/2005 |
| 6809607 | Circuit and method for compensating for non-linear distortion A non-linear distortion compensation circuit and method automatically sets to an optimal value a phase shift of a variable phase shifter and an attenuation of an attenuator according to a transmission frequency, in a non-linear distortion extractor for extracting a ... | 10/26/2004 |
| 6518849 | Dynamic delay compensation versus average switching frequency in a modulator loop and methods thereof The present invention monitors the average switching frequency at the output of the comparator and adjusts the delay compensation accordingly. That is, the switching frequency monitoring circuit looks at the average switching frequency and maintains the a... | 02/11/2003 |
| 6414560 | Loop delay compensation for a digital power amplifier A modulator loop is described having an associated band pass frequency range and including a switching stage having a first delay associated therewith. The modulator loop also includes a modulator stage having a feedback input. The output of the modulator... | 07/02/2002 |
| 6400415 | System and method for predistorting signals to be amplified A system and method for predistorting a signal which is to be amplified by a non-linear amplifier. The system and method uses additional predistortion circuits to eliminate the predistortion caused by amplifier input circuits and amplifier output circuits... | 06/04/2002 |
| 6400777 | Linear modulator Systems and methods for enhancing the linearity of a modulator by filtering a set of frequency components from the modulator output to develop a modulator feedback signal. In a preferred embodiment of the invention, a diplexer separates the output of a ba... | 06/04/2002 |
| 6359524 | Modulation pulse-top ripple compensation for a travelling wave tube pulser A circuit for applying a compensating ripple signal at a low voltage point, such as the collector electrode of a travelling wave tube to compensate for pulse-top ripple extant on a high voltage pulse applied at the travelling wave tube cathode, to provide... | 03/19/2002 |
| 6337606 | Digital communications modulator having a modulation processor which supports high data rates An IC modulation processor (28) may be configured to operate in a single chip mode to accommodate baud rates up to a maximum clock rate for the processor (28) and in a dual chip mode to accommodate baud rates in excess of the maximum clock rate. The IC mo... | 01/08/2002 |
| 6320912 | Digital modulator There is disclosed a digital modulator whose modulation parameter can be controlled and in which modulation data or modulated signals are prevented from generating interference signals with adjoining circuits through control when power supply is turned on... | 11/20/2001 |
| 6246865 | Device and method for controlling distortion characteristic of predistorter A device and a method for meeting the distortion characteristic of a predistorter in accordance with the distortion characteristic of an output amplifier in a transmitter. The device controls the non-linear distortion characteristic of a predistorter in a... | 06/12/2001 |
| 6198778 | Method and device for setup of clipping noise of a multicarrier modulation The present invention relates to a method for setup of a signal in multicarrier modulation, including clipping the signal, in amplitude, with respect to a threshold value, and of reinjecting, with a delay and on the signal to be set up, a clipping noise r... | 03/06/2001 |
| 6194978 | Interrupt modulation method and apparatus The invention is directed toward a simple and cost effective method of wirelessly transmitting digital information with an analog carrier signal. The method, referred to as Interrupt Modulation IM, will allow broadcasters to make the transition from an an... | 02/27/2001 |
| 6052037 | Modulation method and apparatus Disclosed is a modulation method in which the frequency band of a transmission signal, consisting of signal points generated at a given modulation rate in accordance with transmission data, is shifted by a desired frequency shift amount, and which is capa... | 04/18/2000 |
