Power supply voltage dynamic adjustment method, circuit and class-d power amplifier

Abstract

The application relates to a power supply voltage dynamic adjustment method, a circuit and a class-D power amplifier. The method comprises the following steps: performing N times up-sampling on an input signal to obtain a sampling result; wherein N is an integer greater than 1; performing amplitude detection on the sampling result by using an amplitude detection algorithm to obtain an amplitude detection result; the amplitude detection algorithm is used for performing amplitude detection on the sampling result by using a peak detection algorithm combining a shift window and a sliding window; a dynamic power supply voltage control signal is determined by using a multi-grade threshold comparison and a look-up table in combination according to the amplitude detection result; the power supply voltage of a power supply is adjusted according to the dynamic power supply voltage control signal, and the power supply voltage is used for supplying power to an amplification output stage circuit of the class-D power amplifier. The method can improve the efficiency of the class-D power amplifier, reduce the loss, and improve the overall system efficiency of the power amplifier and the power supply in a battery power supply application scenario.

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