Power amplifier and signal processing method thereof

A power amplifier and signal technology, applied in the field of communication, can solve the problems of increasing the total cost of the solution and the space of the circuit board, and achieve the effect of reducing harmonic distortion and noise, reducing cost and improving performance

Inactive Publication Date: 2009-01-21
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This not only increases the overall solution cost and board space, but may al...

Method used

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  • Power amplifier and signal processing method thereof
  • Power amplifier and signal processing method thereof
  • Power amplifier and signal processing method thereof

Examples

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Embodiment Construction

[0022] Embodiments of the present invention provide a power amplifier, such as figure 2 As shown, it is composed of a second-order filter circuit 10 , a modulation circuit 20 and an output circuit 30 . The output end of the second-order filtering circuit 10 is connected with the input end of the modulation circuit 20; the output end of the modulation circuit 20 is connected with the input end of the output circuit 30; input connection. The power amplifier may be a class D power amplifier.

[0023] Wherein the second-order filter circuit 10 outputs the signal to the modulation circuit 20; the modulation circuit 20 is usually a PWM modulation circuit, and generates an output signal by comparing the input signal with a triangle wave or a sawtooth wave (produced by RAMP), and the output signal can be a PWM signal. The PWM signal generated by the modulation circuit 20 is output to the driving stage of the output circuit 30 , and the PWM signal is output through the output circui...

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PUM

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Abstract

The present invention discloses a power amplifier and a processing method thereof. The power amplifier comprises a second-order filter circuit, a modulation circuit and an output circuit; the output end of the second-order filter circuit is connected with the input end of the modulation circuit; the output end of the modulation circuit is connected with the input end of the output circuit; the output end of the output circuit is respectively connected with the input end of either filter circuit in the second-order filter circuit. In the processing method, the dual-feedback second-order filter circuit is applied; the signals are silenced by the second-order filter circuit, modulated by the modulation circuit, and then transmitted outwards by the output circuit. The adoption of the dual-feedback second-order filter circuit effectively reduces the harmonic distortion and noise, which are generated by the modulation circuit and the output circuit, improves the performance of the power amplifier, and reduces the costs of the power amplifier.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a power amplifier and a signal processing method thereof. Background technique [0002] At present, with the increasing popularity of portable consumer electronics products, the requirements for battery working time are also getting higher and higher. Class D amplifiers characterized by high efficiency and low distortion began to be widely used in these products. For low-power audio products, such as mobile phones, MP3, MP4, etc., using class D amplifiers can prolong the service life of batteries; for high-power audio products, such as multimedia speakers, power amplifiers, etc., using class D amplifiers can save heat sinks and use small Standard transformers reduce the overall cost of the product while saving energy and protecting the environment. Different from traditional Class AB amplifiers, Class D amplifiers use technologies such as voltage comparison and pulse wid...

Claims

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Application Information

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IPC IPC(8): H03F3/217
CPCH03F3/217
Inventor 庞世甫刘永平谢旺生
Owner HUAWEI TECH CO LTD
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