High-performance D type audio power amplifier with high-order multipath feedback structure

A multi-channel feedback and audio power technology, applied in amplifiers, amplifiers with semiconductor devices/discharge tubes, improved amplifiers to reduce noise effects, etc., can solve problems such as difficult to achieve high performance and low loop gain, and achieve The effect of simple structure, high integration and high performance

Inactive Publication Date: 2010-09-29
杭州中科微电子有限公司
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, it is difficult for low-order closed-loop structure class D amplifiers to achieve high performance due to low loop gain

Method used

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  • High-performance D type audio power amplifier with high-order multipath feedback structure
  • High-performance D type audio power amplifier with high-order multipath feedback structure
  • High-performance D type audio power amplifier with high-order multipath feedback structure

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Embodiment Construction

[0029] The calculation scheme of the present invention will be further described below in conjunction with the drawings and embodiments.

[0030] figure 2 It is a structural diagram of a class D audio power amplifier monolithic circuit according to an embodiment of the present invention. Wherein, the integrators 221 and 222 of the variable gain amplifier 21 and the cascaded second-order integrator 22 are linear modules, the comparators 231 and 232 of the PWM modulation circuit and the carrier generation circuit 233, the three-state modulation circuit 24, and the gate drive circuit 251, 252 and power output stage 26 are non-linear modules.

[0031] The differential output terminal of the adjustable gain amplifier 21 is connected to the differential input terminal of the first-stage integrator 221 in the cascaded second-order integrator 22, and the differential output terminal of the second-stage integrator 222 is respectively connected to two comparators in the PWM modulation...

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Abstract

The invention discloses a high-performance D type audio power amplifier adopting high-order multipath feedback structure, which comprises a prepositive variable gain amplifier, an integrator, a pulse width modulation (PWM) circuit, a three-state regulating circuit, a grid driving circuit and a power output stage. The integrator is in a two-order structure formed by cascade connection of two stages of integrators, and two paths of feedback are introduced to form a higher-order double-feedback loop, thereby effectively increasing the loop gain and the out-off-band attenuation, and obviously improving the suppression ratio of total harmonic distortion and noise to power sources and other main properties in the range of audio frequency band (22Hz-22KHz). By introducing two paths of voltage negative feedback and comprehensively considering the input dynamic range, the signal-to-noise ratio and stability factors, the ratio of two stages of feedback coefficients can be regulated by regulating the ratio of the input resistance and the feedback resistance of two stages of integrators, thereby ensuring the stability of a system. The D type audio power amplifier with the structure has the characteristics of high integration level and high performance and can be widely applied to the fields of portable equipment, consumer electronics and the like.

Description

technical field [0001] The invention relates to a class-D audio power amplifier, in particular to a high-performance class-D audio power amplifier adopting a high-order multi-channel feedback loop structure. Background technique [0002] Compared with traditional linear amplifiers, the power output stage of Class D amplifiers works in switch mode, so theoretically consumes no quiescent current and has the advantages of high efficiency, and is widely used in the field of audio amplification of portable electronic devices. The main and most widely used modulation method of class D amplifier is PWM (Pulse Width Modulation). The inherent distortion introduced by it and the distortion and noise introduced by system non-ideal factors make it difficult for ordinary class D amplifiers to obtain the same performance as traditional linear amplifiers. performance. The main parameters to measure the performance of Class D amplifiers include total harmonic distortion plus noise, power s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/217H03F1/32H03F1/26
Inventor 黄伟马成炎叶甜春
Owner 杭州中科微电子有限公司
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