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Class D amplifier circuit and audio amplification method

A class D amplifier and operational amplifier technology, applied in the direction of amplifiers, amplifiers with semiconductor devices/discharge tubes, electrical components, etc., can solve the problems that the amplifier cannot achieve operating characteristics, affect the operating voltage of the amplifier, and achieve the optimal operating voltage range Effect

Pending Publication Date: 2021-05-28
REALTEK SEMICON CORP
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

However, in existing Class D amplifiers, the supply voltage of the output stage always affects the operating voltage of the amplifier, so that the amplifier cannot achieve better operating characteristics

Method used

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  • Class D amplifier circuit and audio amplification method
  • Class D amplifier circuit and audio amplification method
  • Class D amplifier circuit and audio amplification method

Examples

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Embodiment Construction

[0014] refer to figure 1 , figure 1 It is a schematic diagram of a class D amplifier circuit according to an embodiment of the present invention. The class D amplifier circuit 10 is used to receive an input voltage Vi and output a driving signal Vo accordingly to drive a load circuit 20 . In some embodiments, the load circuit 20 can be, for example, an audio output device such as an earphone or a stereo, but is not limited thereto.

[0015] Here, the class D amplifier circuit 10 includes an input impedance 110 , a voltage adjustment circuit 130 , an operational amplifier 150 , a pulse generating circuit 170 and a driving circuit 190 .

[0016] The input impedance 110 and the voltage adjustment circuit 130 are coupled to the input end of the operational amplifier 150 . The output terminal of the operational amplifier 150 is coupled to the pulse generating circuit 170 . The pulse generating circuit 170 is coupled to the operational amplifier 150 and the driving circuit 190 . ...

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PUM

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Abstract

The invention relates to a class-D amplifier circuit and an audio amplification method. The class-D amplifier circuit comprises an input impedance, an operational amplifier, a voltage regulation circuit, a pulse generation circuit and a driving circuit. The input impedance is coupled to the input end of the operational amplifier, receives an input voltage and outputs an input current. The operational amplifier outputs an amplification signal according to an input operation voltage and a feedback signal under the power supply of a first power supply voltage. The voltage adjusting circuit adjusts the input operation voltage of the operational amplifier. The pulse generating circuit outputs a pulse width modulation signal according to the amplified signal. The driving circuit generates a driving signal according to the pulse width modulation signal under the power supply of a second power supply voltage, wherein the feedback signal is related to the driving signal.

Description

technical field [0001] The invention relates to an amplifier, in particular to a Class D amplifier circuit and an audio amplification method. Background technique [0002] Class D amplifiers convert audio signals into high-frequency pulses that switch outputs based on the audio input signal. In general, Class D amplifiers use pulse width modulators to generate pulse width modulated signals. Here, the pulse width of the PWM signal can vary with the amplitude of the audio signal. Compared with Class AB amplifiers, Class D amplifiers have high efficiency, which can significantly reduce the cost, size and weight of the overall system, and are widely used in devices with various audio requirements, such as mobile phones, flat-screen TVs and home theater receivers Wait. However, in existing Class D amplifiers, the supply voltage of the output stage always affects the operating voltage of the amplifier, so that the amplifier cannot achieve better operating characteristics. Con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/217
CPCH03F3/217
Inventor 林哲弘赖佑旻锺国骏高立龙
Owner REALTEK SEMICON CORP
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