Sectioned linear transformation method

A piecewise linear and conversion method technology, which is applied in the field of signal processing, can solve the problems that rising and pulse width modulation signals cannot express the degree of distortion, and achieve the effect of reducing the degree of signal distortion

Inactive Publication Date: 2010-06-09
TAI 1 MICROELECTRONICS CORP
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Problems solved by technology

However, when the voltage of the analog signal is higher than the peak voltage of the triangular wave or lower than the valley voltage of the triangular wave, the pulse width modulation signal cannot express the change of the analog signal voltage, resulting in a rapid increase in distortion

Method used

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Embodiment Construction

[0022] See image 3 , The present invention uses the negative input terminal of a comparator 10 to receive a piecewise linear triangular wave signal, and the positive input terminal receives a reference signal. The reference signal can be a sine wave signal or other analog signals, and each of the piecewise linear triangular wave signals A triangular wave is a waveform with at least three different slopes. The triangular wave waveform diagram drawn in Figure 4(a) is a waveform with six slopes. Then, according to the voltage points at which the triangular wave signal and the reference signal intersect, and the slope change of the triangular wave signal, the reference signal is subjected to pulse width modulation conversion to output a pulse width modulation signal.

[0023] The following reference signal is an analog signal as an example. First of all, please refer to Figure 4(a) and Figure 4(b). This is the voltage (V) and time (t) relationship diagram of the signal waveform; the ...

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Abstract

The invention discloses a sectioned linear transformation method which is implemented by firstly utilizing a comparer to receive a sectioned linear triangular wave signal that has at least three sections of wave forms with different slopes and a reference signal, and then transforming the reference signal according to the voltage point where the triangular wave signal and the reference signal interlaced as well as the change of the slopes of the triangular wave signal so as to output a pulse width modulating signal. The invention can reduce the distortion degree of saturation signals of general D class power amplifiers during digital signal transformation.

Description

Technical field [0001] The present invention relates to a signal processing method, in particular to a method of signal piecewise linear conversion in a power amplifier circuit. Background technique [0002] Most of the traditional audio power amplifiers are of class AB. Recently, due to the development of integrated circuits and the demand for high conversion efficiency, class D power amplifiers are increasingly developed. The power conversion efficiency of a class D power amplifier is about 3 to 5 times that of class AB depending on the usage conditions. However, with the current technology, the distortion rate (THD: Total Harmonic Distortion) of the class D power amplifier is greater than that of the class AB. When the output signal of the power amplifier reaches saturation, that is, when the output spike voltage reaches the supply voltage, the distortion rate rises rapidly as the output signal rises. The invention lies in the distortion rate when processing large signals, s...

Claims

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Application Information

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IPC IPC(8): H03F1/32H03F3/217
Inventor 戴枝德
Owner TAI 1 MICROELECTRONICS CORP
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