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
System and method for internet based procurement of goods and services
System and method for oscillator frequency control
Signal processor and signal processing method
Detection system and method for mobile device application
Emergent information database management system
Fabrication of high gradient insulators by stack compression
Trash bag retention device
  Randomly Featured Patents
Air rectification blades
Header for a differential pressure transducer
Current threshold detector circuit
Light-emitting semiconductor apparatus
Coordinated sync point management of protected resources
Apparatus for controlling irrigation water pH for golf courses
Process for the extraction of material from multi-phase systems
Method of resolving mismatched parameters in computer-aided integrated circuit design
Method of producing from a first image data set, a second image data set matched to a real process, and a color management method
Internet radio receiver having a rotary knob for selecting audio content provider designations and negotiating internet access to URLS associated with the designations