Patent ID: 7265613

Claim:
A switching amplifier comprising: an oscillating circuit for generating an oscillating signal and an inverted oscillating signal such that a mean level of the oscillating signal is substantially equal to a mean level of the inverted oscillating signal, wherein the first and the second oscillating signals are identical in amplitude with respect to each other; an inverting circuit for inverting an input signal through using a reference level of the input signal as a symmetric axis so as to generate an inverted input signal, wherein the reference level is between a peak and a valley of the oscillating signal; a first control circuit for generating a first width-limited pulse-width-modulation (PWM) signal in response to the input signal and the oscillating signal, the first width-limited PWM signal having a pulse each cycle with a width larger than or equal to a predetermined first width; a second control circuit for generating a second width-limited PWM signal in response to the inverted input signal and the inverted oscillating signal, the second width-limited PWM signal having a pulse each cycle with a width larger than or equal to a predetermined second width; a first half-bridge switching circuit controlled by the first width-limited PWM signal for determining a potential at a first output terminal; and a second half-bridge switching circuit controlled by the second width-limited PWM signal for determining a potential at a second output terminal.