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
Process for the preparation of morphinane analogues
Weighted determination in configuration management systems
Systems and methods for building axes, co-axes and paleo-geographic coordinates related to a stratified geological volume
Bias voltage generating circuit and switching power supply thereof
Multi-wired antenna for mobile apparatus
Apparatus for tuning a musical instrument, and a related instrument
  Randomly Featured Patents
Shock absorber for a steering column
Method in a communication network
Endoscope with integrated light source
Barbering tool
Methods and apparatus for removing data from a cache
Methods and system for providing real time offers to a user based on obsolescence of possessed items
Optoelectronic devices and a method for producing the same
Disk drive employing a velocity profile and back EMF feedback to control a voice coil motor
Segmentation method for use against moving objects
Battery powered food stirrer with pivotally mounted spring biased arms