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| Number | Title | Issue Date |
| 8115564 | Systems and methods to minimize startup transients in class-D amplifiers Systems and methods for minimizing startup transients in digital audio controllers that may result in audible artifacts in the output of an audio amplification system. One embodiment comprises a digital PWM amplifier that includes a mechanism for controlling the amo... | 02/14/2012 |
| 8115563 | Pulse width modulation circuit and voltage-feedback class-D amplifier circuit The frequency characteristic of a voltage-feedback class-D amplifier circuit for driving an output load is improved. A triangular-wave correction circuit which compensates a gradient of a triangular wave is provided to a triangular-wave signal generator which suppli... | 02/14/2012 |
| 8081041 | Glue-logic based method and system for minimizing losses in oversampled digitally controlled DC-DC converters A practical method and system for oversampled digitally controlled DC-DC converters is presented. To minimize the switching losses while maintaining all advantages of the oversampling, “glue logic” and application specific oversampling digital pulse-width modula... | 12/20/2011 |
| 8076987 | Pulse width modulating circuit A pulse width modulating (PWM) circuit includes an activating module and a pulse generating module connected to the activating module. The activating module includes a current resource and a compensation unit. The current source generates an activating current, and ... | 12/13/2011 |
| 8072283 | Signal modulation for switched mode power amplifiers In a device (10) for modulating Cartesian base band signals (I, Q) a first and second mapping unit (12, 14) each map signal samples of a corresponding Cartesian signal (I, Q) to intermediary signal sections having only two non-zero levels provided symm... | 12/06/2011 |
| 8044743 | Method and apparatus for pulse position modulation A method for reducing the transition rate of a pulse width modulated signal representing an original signal having a predetermined frequency range of interest and producing an output signal, the method including the steps of: combining pulses from a predetermined nu... | 10/25/2011 |
| 7965151 | Pulse width modulator with two-way integrator A pulse width modulator (PWM) includes a driver and a two-way integrator. The driver is coupled to output a first and a subsequent period of a PWM signal. Both the first and the subsequent periods include the PWM signal changing between first and second states. The ... | 06/21/2011 |
| 7952446 | Microcomputer having CPU and PWM timer A microcomputer includes: a CPU executing a predetermined calculation process; and a PWM timer generating a PWM pulse. The PWM timer includes a RAM for storing a duty value of the PWM pulse and a PWM controller for generating the PWM pulse. The PWM controller includ... | 05/31/2011 |
| 7932790 | Switched modulation of a radio-frequency amplifier Switch-modulation of a radio-frequency power amplifier by-representing the input signal by the I-signal (1) and Q-signal (9) of the complex components (I+j−Q), and pulse width modulating the I-signal and the Q-signal separately to create a modulated ... | 04/26/2011 |
| 7898353 | Clock conditioning circuit A circuit includes a clock conditioning circuit which receives an encoded clock signal, and provides first and second conditioned clock signals in response. The clock conditioning circuit adjusts a period of the first and second conditioned clock signals in response... | 03/01/2011 |
| 7889019 | Pulse width modulation sequence generating a near critical damped step response A digital circuit implementing pulse width modulation controls power delivered in what one can model as a second order or higher order system. An exemplary control plant could embody a step-down switch mode power supply providing a precise sequence of voltages or cu... | 02/15/2011 |
| 7868711 | Arrangement for pulse-width modulating an input signal An arrangement for pulse-width modulating an analog or digital input signal is provided. The non-linear distortion generated in the pulse-width modulator is precompensated by applying a signal with reversed error to the pulse-width modulator. The signal with reverse... | 01/11/2011 |
| 7847651 | Method of and apparatus to generate pulse width modulated signal from sampled digital signal by chaotic modulation A method and apparatus to generate a pulse width modulated signal from a sampled digital signal by chaotic modulation. The method includes generating predetermined chaotic intervals having random interval values using a chaotic interval generator, and generating the... | 12/07/2010 |
| 7830219 | Variable pulse-width modulation with zero D.C. average in each period Pulse-width modulation (PWM) finds wide use in many applications including motor control, communication systems, music synthesizers, power supplies, class-D and digital amplifiers, among others. The Fourier series expansion of each period of a pulse waveform include... | 11/09/2010 |
| 7830218 | Communications device and data transmission method 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 th... | 11/09/2010 |
| 7804378 | Method and apparatus for pulse width modulation There is described a method and an apparatus for pulse width modulation with a predefined switching period having an adjustable ratio of the switch-on duration to the switch-off duration, in which a quantized signal is converted into a pulse-width-modulated signal a... | 09/28/2010 |
| 7804379 | Pulse width modulation dead time compensation method and apparatus Dead time compensated complementary pulse width modulation (PWM) signals are derived from a PWM generator by first applying time period compensation to the PWM generator signal based upon the direction of current flow in an inductive load being controlled by the PWM... | 09/28/2010 |
| 7791427 | Systems and methods to minimize startup transients in class D amplifiers Systems and methods for minimizing startup transients in digital audio controllers that may result in audible artifacts in the output of an audio amplification system. One embodiment comprises a digital PWM amplifier that includes a mechanism for controlling the amo... | 09/07/2010 |
| 7782154 | Power amplifier and modulator thereof A power amplifier including a loop filter, a frequency generator, a quantizer, and an output stage module is provided. The frequency generator outputs a signal with a reference frequency to the loop filter, and includes a logic circuit, a current array, and a dummy ... | 08/24/2010 |
| 7777587 | Minimum pulse width for pulse width modulation control The rising edge of a pulse width modulated output signal occurs after an input ramp signal starts to rise. The ramp signal starts to rise after the rising edge of a periodic set signal and before the falling edge of a periodic set signal. A feedback control signal i... | 08/17/2010 |
| 7760041 | Pulse-width modulator methods and apparatus Otherwise conventional pulse-width modulators (PWMs) generate signals that can be converted into other forms by reshapers, and thereby overcome many of the problems of conventional PWMs in applications that demand high performance, such as switched-mode amplifiers a... | 07/20/2010 |
| 7741927 | PWM control circuit and motor equipped with the same The PWM control circuit is provided. The PWM control circuit includes: a PWM control signal generator that generates a PWM period signal defining a period of a PWM signal and a PWM resolution signal specifying a resolution in one period of the PWM period signal; and... | 06/22/2010 |
| 7728689 | Pulse width modulator system The invention relates to pulse width modulator system (PWMS) comprising a modulator system input (MI),a modulator output (MO), an amplitude distribution filter (ADF) ,and a pulse width modulator (PMOD), wherein said amplitude distribution filter (ADF) establishes an... | 06/01/2010 |
| 7719377 | Alternating digital RF modulation A pulse step modulator employs a plurality of series connected unit step power amplifier modules. Each module is turned on by a turn-on signal to provide a unit step voltage of a given value. An output circuit is connected to the modules for providing an output volt... | 05/18/2010 |
| 7714675 | All digital Class-D modulator and its saturation protection techniques Methods and systems for modulating an input electrical signal are disclosed and may comprise modulating input signals utilizing a digital Class-D modulator and generating a digital output signal that is proportional to the input signals. The digital Class-D modulato... | 05/11/2010 |
| 7710214 | Pulse width modulation structure enabling regulated duty cycle A pulse width modulation (PWM) structure enabling regulated duty cycle includes a DC power supply unit, a signal generating unit, a voltage-dividing resistor unit, a reference voltage unit, and a comparing unit. When the DC power supply unit supplies a voltage signa... | 05/04/2010 |
| 7705689 | Synchronously stackable double-edge modulated pulse width modulation generators Synchronously stackable double-edge modulated pulse width modulation generators are disclosed. An example pulse width modulation generator includes a ramp generator to generate first and second ramp signals that interact to form a virtual ramp signal; and a comparat... | 04/27/2010 |
| 7659789 | Signal modulation scheme in class-D amplification and circuit therefor A class-D amplifier (10) includes a logic circuit (40) for controlling the operation of a switching bridge (11). The logic circuit (40) transmits the differential mode of a differential pulse width modulation input signal and deletes a ce... | 02/09/2010 |
| 7642876 | PWM generator providing improved duty cycle resolution A PWM generator system provides improved duty cycle resolution using a sub-cycle generator for generating a sub-cycle with a period that is a small fraction of the maximum PWM period to be generated. An integral sub-cycle estimator is coupled to said sub-cycle gener... | 01/05/2010 |
| 7642877 | Self-oscillating modulator and method for adjusting a self-oscillating modulator A self-oscillating pulse-width modulator comprises an input, an output and a control loop. The control loop comprises a forward branch and a feedback loop. The forward branch is connected between the input and the output and comprises a comparator and a delay elemen... | 01/05/2010 |
| 7583158 | PWM signal generating circuit A PWM signal generating circuit according to the invention includes a digital PWM signal generating circuit that generates a digital PWM signal having a resolution of 2n based on a clock signal CLK and n-bits (n≧1) of digital information; a triangular wave generat... | 09/01/2009 |
| 7561002 | Method and apparatus for frequency modulating a periodic signal of varying duty cycle A method and apparatus for frequency modulating a PWM involves 1) generating a high frequency carrier signal much greater in frequency than the PWM signal; 2) modulating the high frequency signal to generate a spread spectrum carrier signal; and, 3) retiming a PWM s... | 07/14/2009 |
| 7557670 | Circuit and method for generating a continuous pulse signal The present invention discloses a circuit and method for generating a continuous pulse signal. The circuit of the present invention comprises: a PWM device generating a clock signal and a PWM signal, and a pulse continuity detector coupled to the PWM device. The pul... | 07/07/2009 |
| 7532082 | Synchronization circuit for synchronizing PWM modulators A synchronization circuit for synchronizing at least two self-oscillating PWM modulators, each outputting a respective pulse-width-modulated output signal comprising signal pulses with signal pulse centers, shifts the timings of the signal pulses relative to one ano... | 05/12/2009 |
| 7492233 | Precision modulated controller output A modulating controller for use in providing a precision modulating output is disclosed. An illustrative modulating controller may include a voltage regulator adapted to output a single reference voltage, at least one modulating circuit adapted to convert a pulse-wi... | 02/17/2009 |
| 7486155 | Circuit and method for pulse width modulation by means of synchronized, self-oscillating pulse width modulators 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 sign... | 02/03/2009 |
| 7479840 | Digital pulse width controlled oscillation modulator A pulse width modulator (10) for converting a digital signal into a PWM signal, comprising a plurality of integrators (11) with integrator gains (12) arranged in series, a comparator (17) for comparing the output of the last integrator ( | 01/20/2009 |
| 7474168 | Modulation-signal generator circuit, image display apparatus and television apparatus A modulation-signal generator circuit generates a modulation signal having a time width corresponding to tone data that is input. The modulation-signal generator circuit includes an output section outputting the modulation signal and a control circuit. The output se... | 01/06/2009 |
| 7468639 | Modulation circuit, driving circuit and output method A modulation circuit that outputs modulation signals, comprising: a memory circuit that stores waveform data that determines the time width of a portion of a modulation signal, the portion being adjusted to a predetermined amplitude value, the waveform data being st... | 12/23/2008 |
| 7433403 | Pulse width modulation method for a power converter A pulse width modulation method has the steps of operating a second instruction signal so that each of the differences between two or three arbitrary instruction signals in three first instruction signals may become more than the predetermined value, and modulating ... | 10/07/2008 |
