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Triangle wave generating circuit, pulse width modulation circuit and audio power amplifying circuit

A technology for generating circuits and triangular waves, which is applied in pulse duration/width modulation, pulse generation, differential amplifiers, etc., and can solve problems such as the inability to change the amplitude of triangular waves

Inactive Publication Date: 2009-03-25
SHENZHEN XPTEK TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the embodiments of the present invention is to provide a triangular wave generating circuit, aiming to solve the problem that the amplitude of the triangular wave output by the existing triangular wave generating circuit cannot be adaptively changed with the power supply voltage

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  • Triangle wave generating circuit, pulse width modulation circuit and audio power amplifying circuit
  • Triangle wave generating circuit, pulse width modulation circuit and audio power amplifying circuit
  • Triangle wave generating circuit, pulse width modulation circuit and audio power amplifying circuit

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Embodiment Construction

[0017] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0018] In the embodiment of the present invention, the reference voltage generated by the reference voltage generating circuit that can adaptively change with the power supply voltage makes the amplitude of the output triangular wave adaptively change with the power supply voltage; at the same time, the reference voltage generating circuit generates an adaptively changing reference The current stabilizes the frequency of the output triangle wave.

[0019] The triangular wave generation circuit provided by the embodiment of the present invention is mainly used in pulse width modulation circuits and ...

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Abstract

The invention is suitable for the field of integrated circuit and provides a triangular wave generating circuit, a pulse-width modulation circuit and an audio power amplification circuit. The triangular wave generating circuit comprises a reference voltage generating circuit which generates a reference current and a reference voltage which are adapted to the change with a power supply voltage according to the power supply voltage, and an oscillating circuit which generates a triangular wave output according to the reference voltage and the reference, wherein the amplitude of the triangular wave is adapted to the change of the power supply voltage. In the invention, the reference voltage which can be adapted to the change along with the power supply voltage is generated by the reference voltage generating circuit so as to enable the amplitude of the triangular wave output by the oscillating circuit to be adapted to the change along with the power supply voltage. Meanwhile, the self-adapted reference current generated by the referential voltage generating circuit can ensure the stable frequency of the triangular wave output by the oscillating circuit.

Description

technical field [0001] The invention belongs to the field of integrated circuits, and in particular relates to a triangular wave generation circuit, a pulse width modulation circuit and an audio frequency power amplification circuit. Background technique [0002] In class D audio power amplifiers, pulse width modulation technology (i.e. PWM modulation) needs to be used. The analog signal generates a pulse signal after PWM modulation. The width of the pulse signal is proportional to the amplitude of the input analog signal, and the output PWM modulated pulse passes through After low-pass filtering, it is restored to an analog signal to drive the speaker to produce sound. [0003] An essential module in PWM modulation is a triangular wave generating circuit. The input analog signal is compared with the triangular wave signal to generate a PWM signal whose output pulse width is linearly related to the amplitude of the input analog signal. In the prior art, a triangular wave ge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K4/08H03K4/502G05F1/56H03F3/45H03K7/08
Inventor 裴晓东周命福
Owner SHENZHEN XPTEK TECH
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