Resources Contact Us Home
Output circuits with class D amplifier

Image Number 12 for United States Patent #8022756.

Output circuits using pulse width modulation (PWM) and/or pulse density modulation (PDM) are described. In one aspect, a PWM output circuit includes a PWM modulator that operates based on a square wave signal instead of a sawtooth or triangular wave signal. In another aspect, a PDM output circuit includes a PDM modulator that uses variable reference voltages to reduce variations in switching frequency. In yet another aspect, a dual-mode output circuit supports both PWM and PDM and includes a pulse modulator and a class D amplifier. The pulse modulator performs PWM on an input signal if a PWM mode is selected and performs PDM on the input signal if a PDM mode is selected. The class D amplifier receives a driver signal from the pulse modulator and generates an output signal.

  Recently Added Patents
Bicycle shifting method
Categorization of design rule errors
Method and apparatus for belling plastic pipe
Coffee cup stationery tab
Method and apparatus for token-based context caching
Image forming apparatus, control method and computer-readable medium for stopping a print job during printing by a printer
  Randomly Featured Patents
Medical slings
Product and process of making a beer having increased light stability
Stuffed toy figure
Method and apparatus for electrophotography capable of changing over images from positive to negative and vice versa
Lubricant supply device for auxiliary machine of engine
Digital image processing method for local determination of the center and the width of objects in the form of contrasting bands on a background
System for making an optical glass from a blank
Magnetic conditoning of fluids and gases and apparatus therefor
Hair restoring method and apparatus for carrying out the same
Rhodium electroplated structures and methods of making same