Non-filter circuit construction for D type power amplifier and processing method thereof

Abstract

The invention provides a D-type power amplifier filter-free circuit structure and a processing method thereof. By comparing two or more than two amplitude limiting triangular signals or a fitting triangular signal having the same or opposite phase as an audio signal, and controlling the overlapping condition of the amplitude between triangular waves through an amplitude limiting triangular circuit or a fitting triangular circuit, the effect of removing or controlling the narrow pulse at the zero position of the audio signal is achieved and the circuit power consumption of the power amplifier is reduced. The invention achieves the optimal effect by controlling the distortion at the zero position through controlling the overlapping degree of the triangular wave and provides a flexible and effective circuit structure for controlling the zero power consumption and distortion.

Description

technical field [0001] The invention relates to the field of signal processing, in particular to the circuit power consumption and signal distortion control technology in the technical field of circuit signal filtering and processing. Background technique [0002] Class D power amplifiers are two to five times more efficient than Class AB power amplifiers. In order to ensure its high efficiency, the class D power amplifier needs to reduce the power consumption as much as possible, and significantly reduce the system cost. Usually, reducing zero-crossing power consumption is a relatively common method, which can effectively reduce the power loss of the amplifier on the basis of retaining the effective information of the signal, and at the same time control the signal distortion within a reasonable range. [0003] The patent in Figure 1 (patent number: US6211728B1, patent application date: 2001.4.3) compares the original audio signal with a triangular wave signal to obtain th...

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Problems solved by technology

The defect of the above-mentioned prior art is that when the frequency of the triangular wave is fixed, the triangular wave crosses the zero point position of the audio signal in the above two methods, resulting in the staggering of OUTP and OUTN near the zero point, which will inevitably occur at the OUTP-OUTN There is a narrow pulse signal in the difference signal. Since the span of the triangular wave relative to the audio signal is irregular, none of the above techniques can control the number of narrow pulses near the zero point of the signal and the frequency of their occurrence, etc., which increases the zero point to a certain extent. The uncertainty of the power loss in the position affects the stability of the efficiency of the class D power amplifier

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