Class D power amplifier and electronic device

Abstract

The application discloses a class D power amplifier, comprising: an integral amplification module comprising a first input end, a second input end, a first output end and a second output end, the first input end and the second input end respectively receiving a first audio signal and a second audio signal, the integral amplification module performs integral amplification on the first audio signaland the second audio signal and then outputs a first driving signal and a second driving signal through a first output end and a second output end respectively, and the first output end and the firstinput end are connected with the two ends of the first pull-down resistor respectively; the second output end and the second input end are connected with the two ends of the second pull-down resistorrespectively, and the first driving signal and the second driving signal are used for driving an external load. The class D power amplifier also comprises a common-mode bias current generation module,used for providing a first bias current and a second bias current which are equal in magnitude, one end of the first bias current is connected with the first input end, and the other end of the firstbias current is grounded; one end of the second bias current is connected with the second input end, and the other end is grounded. The invention further discloses an electronic device. The power amplifier has the advantages of being good in bottom noise, power consumption and the like.

Description

technical field [0001] This application relates to electricity, and specifically relates to a class D power amplifier and electronic equipment. Background technique [0002] Compared with Class AB power amplifiers, Class D power amplifiers have higher efficiency and better heat dissipation, and have great demand and market in small and light portable devices. Moreover, as TVs and sound box equipment become thinner and thinner, it is necessary to reduce or eliminate the need for additional heat sinks, and it is necessary to use Class D power amplifiers with higher efficiency. At the same time, for portable devices using batteries, in order to prolong the battery life, it is also necessary to use Class D power amplifiers with higher efficiency. Therefore, the current market space for Class D power amplifiers is huge. At present, in portable devices, speakers, TVs and other products, the application scheme using Class D power amplifiers has been called the mainstream applicati...

AI Technical Summary

Problems solved by technology

Because the existing class D power amplifier needs to set the preamplifier to make the input common mode voltage and output voltage of the integrator establish a suitable operating point, but the static power consumption of the preamplifier is relatively large

Moreover, the noise of the preamplifier will be amplified by the post-amplifier gain, which will lead to a larger noise floor and poor user experience.

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