Patents by Inventor Jorge Miguel Alves Silva Duarte

Jorge Miguel Alves Silva Duarte has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Class D amplifier having PWM circuit with look-up table
    Patent number: 7956681
    Abstract: A class D amplifier includes a noise-shaping modulator, a pulse width modulator, and a pulse amplifier. The noise-shaping modulator receive a pulse code modulated (PCM) signal and produces an oversampled PCM signal. The pulse width modulator produce a pulse width modulated (PWM) signal from the oversampled PCM signal. The pulse amplifier amplifies the PWM signal to produce an amplified PWM signal. The PWM uses a lookup table to convert from PCM to PWM. A compensation circuit optimizes amplifier performance. An optional demodulator filter converts the amplified PWM signal to an analog signal. The amplifier is ideal for integrated audio applications.
    Type: Grant
    Filed: April 22, 2010
    Date of Patent: June 7, 2011
    Assignee: Synopsys, Inc.
    Inventors: David Filipe Correia Guilherme, Jorge Miguel Alves Silva Duarte
  • Class D Amplifier Having PWM Circuit With Look-Up Table
    Publication number: 20100201445
    Abstract: A class D amplifier includes a noise-shaping modulator, a pulse width modulator, and a pulse amplifier. The noise-shaping modulator receive a pulse code modulated (PCM) signal and produces an oversampled PCM signal. The pulse width modulator produce a pulse width modulated (PWM) signal from the oversampled PCM signal. The pulse amplifier amplifies the PWM signal to produce an amplified PWM signal. The PWM uses a lookup table to convert from PCM to PWM. A compensation circuit optimizes amplifier performance. An optional demodulator filter converts the amplified PWM signal to an analog signal. The amplifier is ideal for integrated audio applications.
    Type: Application
    Filed: April 22, 2010
    Publication date: August 12, 2010
    Applicant: Synopsys, Inc.
    Inventors: David Filipe Correia Guilherme, Jorge Miguel Alves Silva Duarte
  • Class D amplifier having PWM circuit with look-up table
    Patent number: 7733171
    Abstract: A class D amplifier includes a noise-shaping modulator, a pulse width modulator, and a pulse amplifier. The noise-shaping modulator receive a pulse code modulated (PCM) signal and produces an oversampled PCM signal. The pulse width modulator produce a pulse width modulated (PWM) signal from the oversampled PCM signal. The pulse amplifier amplifies the PWM signal to produce an amplified PWM signal. The PWM uses a lookup table to convert from PCM to PWM. A compensation circuit optimizes amplifier performance. An optional demodulator filter converts the amplified PWM signal to an analog signal. The amplifier is ideal for integrated audio applications.
    Type: Grant
    Filed: December 31, 2007
    Date of Patent: June 8, 2010
    Assignee: Synopsys, Inc.
    Inventors: David Filipe Correia Guilherme, Jorge Miguel Alves Silva Duarte
  • Class D Amplifier Having PWM Circuit with Look-up Table
    Publication number: 20090167431
    Abstract: A class D amplifier includes a noise-shaping modulator, a pulse width modulator, and a pulse amplifier. The noise-shaping modulator receive a pulse code modulated (PCM) signal and produces an oversampled PCM signal. The pulse width modulator produce a pulse width modulated (PWM) signal from the oversampled PCM signal. The pulse amplifier amplifies the PWM signal to produce an amplified PWM signal. The PWM uses a lookup table to convert from PCM to PWM. A compensation circuit optimizes amplifier performance. An optional demodulator filter converts the amplified PWM signal to an analog signal. The amplifier is ideal for integrated audio applications.
    Type: Application
    Filed: December 31, 2007
    Publication date: July 2, 2009
    Applicant: Chipldea Microelectronica S.A.
    Inventors: David Filipe Correia GUILHERME, Jorge Miguel Alves Silva DUARTE