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D-type audio power amplifier and sampling triangular wave generating and filtering circuit used therein

A filter circuit and triangular wave technology, applied in multiple input and output pulse circuits, pulse generation, amplifiers with semiconductor devices/discharge tubes, etc., can solve the poor THD performance of class D audio power amplifiers and the sampling accuracy of PWM comparators To improve THD performance and improve sampling accuracy

Pending Publication Date: 2020-11-03
广芯电子技术(上海)股份有限公司
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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the defect that the existing Class D audio power amplifier has poor sampling accuracy of the PWM comparator due to the high-frequency noise component contained in the sampling triangle wave, and then causes the poor THD performance of the Class D audio power amplifier. , propose a class D audio power amplifier and a sampling triangular wave generation and filter circuit for it

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  • D-type audio power amplifier and sampling triangular wave generating and filtering circuit used therein
  • D-type audio power amplifier and sampling triangular wave generating and filtering circuit used therein
  • D-type audio power amplifier and sampling triangular wave generating and filtering circuit used therein

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Embodiment Construction

[0035] The preferred embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. The following descriptions are exemplary and not limiting to the present invention. Any other similar situations will also fall within the protection scope of the present invention.

[0036] In the following detailed description, directional terms, such as "left", "right", "upper", "lower", "front", "rear", etc., are used with reference to directions described in the drawings. Components in various embodiments of the invention may be positioned in a variety of different orientations, and directional terms are used for purposes of illustration and not limitation.

[0037] Such as figure 1 As shown, the class D audio power amplifier involved in the present invention generally includes a pre-stage operational amplifier, an integrator, a triangle wave oscillator, a PWM comparator, a driving stage (driving circuit), an output power devic...

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Abstract

The invention discloses a D-type audio power amplifier and a sampling triangular wave generating and filtering circuit used therein. The D-type audio power amplifier comprises a PWM comparator, and the sampling triangular wave generating and filtering circuit comprises an oscillator used for providing a sampling triangular wave signal to be output to the PWM comparator; and a triangular wave filter circuit, wherein the input end of the triangular wave filter circuit is connected with a sampling triangular wave signal, the output end of the triangular wave filter circuit is connected with the reverse input end of the PWM comparator, and the triangular wave filter circuit is provided with a cut-off frequency and is configured to filter the accessed sampling triangular wave signal based on the cut-off frequency. According to the D-type audio power amplifier and the sampling triangular wave generating and filtering circuit used in the D-type audio power amplifier, high-frequency noise contained in the sampling triangular wave is filtered out, the sampling precision of the PWM comparator can be improved, and then the THD performance of the D-type audio power amplifier can be improved.

Description

technical field [0001] The present invention relates to a PWM (Pulse Width Modulation) module in a Class D audio power amplifier (also known as a CLASS D audio power amplifier or a digital audio power amplifier), in particular to a generation and filter circuit for inputting a triangular wave signal for sampling. Background technique [0002] With the explosive growth of multimedia portable devices in the market in recent years, audio power amplifiers have become the standard configuration of the audio part. Among them, CLASS D power amplifier has been more and more widely used due to its high quality and high efficiency. [0003] The PWM system in the CLASS D audio power amplifier compares the audio signal with a triangle wave, and the audio signal is converted into a train of pulse waves. The duty cycle of the pulse wave reflects the amplitude of the audio signal. Sampling with an appropriate triangle wave can effectively improve the total harmonic distortion (THD, full ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/217H03F1/32H03K4/06H03K5/22
CPCH03F3/2171H03F1/32H03K4/06H03K5/22
Inventor 梅新庆张阳戴忠伟
Owner 广芯电子技术(上海)股份有限公司
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