Patent ID: 6737917
Filing Date: 2004-05-18
Classification: H03F

Abstract:
A digital power amplifier comprising a first amplifier block and a second amplifier block, the first amplifier block comprising:a noninverting amplifier performing a noninverting amplification for an inputted analog signal; a triangular wave oscillator generating a triangular wave having a regular frequency; a first comparator comparing an output signal of the amplifier with an output signal of the triangular wave oscillator, and outputting a square wave; a first switching block composed of a first switch and a second switch switching an output signal of the comparator in turns; a first controller preventing the first switch and the second switch of the first switching block from being in the same state at the same time; a first filter converting an output signal of the first switching block controlled by the first controller into an analog signal; and a first sub-feedback circuit performing a sub-feedback operation for an output signal of the first filter, and inputting the sub-fed signal to the noninverting amplifier; and the second amplifier block comprising: an inverting amplifier inputting an inverted analog signal, inputting a regular voltage, and amplifying the analog signal; a second comparator comparing an output signal of the inverting amplifier with an output signal of the triangular wave oscillator of the first amplifier block, and outputting a square wave; a second switching block composed of a third switch and a fourth switch switching an output signal of the second comparator in turns; a second controller preventing the first switch and the second switch of the switching block from being in the same state at the same time; a second filter converting an output signal of the second switching block controlled by the second controller into an analog signal; and a second sub-feedback circuit performing a sub-feedback operation for an output signal of the second filter, and inputting the sub-fed signal to the amplifier; wherein, the first amplifier block and the second amplifier block are symmetrical to each other based on load.