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Digital power amplifier adapted for low-voltage carrier communication

A digital power and amplifier technology, applied in the field of power amplifiers, can solve problems such as increased system power consumption, local temperature rise, and low efficiency of linear power amplifiers

Inactive Publication Date: 2007-05-23
MIARTECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This processing structure is simple, but the disadvantages are also obvious. The equivalent load impedance of the low-voltage carrier channel changes drastically, especially when the load impedance is very low, the linear power amplifier is easy to produce overload distortion; because the efficiency of the linear power amplifier is not high, it will be greatly Increase the power consumption of the system; at the same time, it will also cause the local temperature of the PCB to rise, and thermal design needs to be carefully considered

Method used

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  • Digital power amplifier adapted for low-voltage carrier communication
  • Digital power amplifier adapted for low-voltage carrier communication
  • Digital power amplifier adapted for low-voltage carrier communication

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Embodiment Construction

[0016] The block diagram of the principle structure of the class D power amplifier is shown in Figure 2. Among them, the triangular wave generator module 111 outputs a high-frequency triangular wave, and its frequency is usually more than 10 times higher than the highest frequency of the input signal. The pulse width modulator module 112 completes the pulse width modulation of the input signal, and changes the linear input signal into a level signal. Level module 113 completes the power amplification of the level signal, because the power amplification is carried out to the level signal, so the transistor works in the nonlinear region, and the efficiency can be very high (more than 90%), and the bandpass filter module 114 completes the pulse alignment Low-pass filtering of the wide modulated output signal to finally restore the linear input signal.

[0017] There may be multiple ways in specific implementation, including analog or digital ways. The present invention adopts th...

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Abstract

The invention relates to a power amplifier in digit method, wherein it is formed by sampling filter, noise, noise rectifying circuit, dead area control circuit, output driving circuit, and band-pass filter circuit. The power amplifier works at switch mode, while the switch frequency is higher than maximum input frequency; all parts beside power element are based on digit method. The inventive amplifier has high efficiency, low harmonic wave aberration, and low thermal consumption.

Description

technical field [0001] The invention relates to a power amplifier, which is composed of an up-sampling filter, a noise shaping circuit, a dead zone control circuit, an output drive circuit and a band-pass filter circuit connected to the rear end, and works in a digital mode. Background technique [0002] A power amplifier is a special amplifier whose main function is to provide sufficient output power to meet system design requirements. In terms of usage, there are mainly audio power amplifiers and communication power amplifiers. Here we mainly discuss communication power amplifiers. [0003] The main performance indicators of power amplifiers include output power, power conversion efficiency, etc., and are divided into Class A power amplifiers, Class B power amplifiers, Class AB power amplifiers, and Class D power amplifiers from the realization form. The first three of them all work in the linear region of the power amplifier, while the Class D power amplifier works in th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/02H03F3/217
CPCH03F3/217
Inventor 宋朝盛吴艳辉汪运来
Owner MIARTECH
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