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System and method for amplifying G-class voice frequency

An audio amplification system and audio amplification technology, applied in low-frequency amplifiers, power amplifiers, improving amplifiers to improve efficiency, etc., can solve problems such as electromagnetic interference, low efficiency, and increased circuit board area, and achieve small space occupation and high efficiency. , low cost effect

Active Publication Date: 2013-10-09
CHENGDU MONOLITHIC POWER SYST
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Problems solved by technology

However, the circuit 30 has the following disadvantages: the buck circuit occupies a large layout area, which increases the area of ​​the circuit board of the circuit 30; the efficiency of the buck circuit is very low under light load; an additional inductance 40 is required, which increases the cost and generates electromagnetic waves. interference problem

Method used

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  • System and method for amplifying G-class voice frequency
  • System and method for amplifying G-class voice frequency
  • System and method for amplifying G-class voice frequency

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Embodiment Construction

[0031] Figure 4 It is a class-G audio amplification system 100 according to an embodiment of the present invention. Wherein the class G audio amplifier system 100 includes an input terminal to receive the audio input signal INL; the AB class audio amplifier stage 103 is coupled to the input terminal to receive the audio input signal INL, and outputs the audio amplifier signal OUTL to the speaker 107; input level detection Unit 101, coupled to the input terminal to detect the magnitude of the audio input signal INL, and output the level detection signal IN DET ; The charge pump 102 is coupled to the output terminal of the input level detection unit 101 and receives the level detection signal IN DET , the output positive supply signal HPV DD and negative supply signal HPV SS .

[0032] Among them, the positive power supply HPV of the class AB audio amplifier stage 103 DD and negative supply HPV SS Provided by the charge pump 102, the capacitor 104 and the capacitor 105 ar...

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Abstract

The invention discloses a system and method for amplifying a G-class voice frequency. The system for amplifying the G-class voice frequency comprises an input end, a voice frequency amplification grade, an input level detection unit and a charge pump. The system and method for amplifying the G-class voice frequency adjust a power supply signal of the voice frequency amplification grade according to the size of an input signal, and the system for amplifying the G-class voice frequency can have high efficiency and high-fidelity output.

Description

[0001] This application is a divisional application filed on October 20, 2009, the application number is 200910308523.1, and the invention name is "G class audio amplification system and method". technical field [0002] The present invention relates to an audio amplification system, and more specifically, the present invention relates to a class-G audio amplification system and method. Background technique [0003] Class AB amplifiers have good output characteristics, but are too inefficient. In order to maintain the output sound quality and improve efficiency, Class G amplifiers appeared. [0004] The working principle of a class G amplifier is similar to that of a class AB amplifier, the difference is that the power supply of the class G amplifier is a variable voltage rather than a fixed voltage. As the input signal amplitude changes, the Class G amplifier automatically adjusts the supply voltage to minimize the voltage drop across the output transistor, greatly improvi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/02H03F3/183H03F3/20
Inventor 王海时张正伟林金燕王锐
Owner CHENGDU MONOLITHIC POWER SYST
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