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

A technology for generating circuits and triangular waves, applied in pulse generation, multiple input and output pulse circuits, amplifiers with semiconductor devices/discharge tubes, etc., can solve problems such as poor THD performance and poor linearity, and achieve improvement Good THD performance and waveform linearity

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 in the present invention is to overcome the defect of poor THD performance due to the poor linearity of the sampling triangular wave signal of the existing Class D audio power amplifier, and propose a Class D audio power amplifier and a sampling triangular wave generating circuit for it

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

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Embodiment Construction

[0030] 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.

[0031] 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.

[0032] like figure 2 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 device ...

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Abstract

The invention discloses a D-type audio power amplifier and a sampling triangular wave generation circuit used therein. The sampling triangular wave generation circuit comprises a charging current source and a discharging current source; a triangular wave generation capacitor which is used for outputting a sampled triangular wave signal and is provided with a first end, wherein the first end of thetriangular wave generation capacitor is connected with the grounding end of the discharge current source; a PMOS switch which is operably connected with the second end of the triangular wave generation capacitor and the charging current source; an NMOS switch which is operably connected with the second end of the triangular wave generation capacitor and the discharge current source; and an oscillator which is used for generating a clock signal and driving the PMOS switch and the NMOS switch based on the clock signal. According to the D-type audio power amplifier and the sampling triangular wave generation circuit used in the D-type audio power amplifier, the constant current source is designed to charge and discharge the capacitor, so the output triangular wave form linearity is good andstable, and 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 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 name Total ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/217H03F1/32H03K4/06H03K5/22
CPCH03F1/32H03F3/2171H03K4/06H03K5/22
Inventor 梅新庆张阳虞志雄戴忠伟
Owner 广芯电子技术(上海)股份有限公司
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