Differential Pulse Amplitude Wave Width Digital-to-Analog Conversion Device and Signal Encoding Method
A digital-to-analog conversion and pulse amplitude technology, which is applied in the field of aPWM-DAC devices that generate high signal-to-noise ratios, and can solve problems such as manufacturing technical difficulties
Active Publication Date: 2020-12-25
TRITAN TECH INC
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Problems solved by technology
However, in practical applications, in order to produce a pair of pulse signals with such a precise and symmetrical time axis and voltage amplitude, the circuit process and external wiring load must be completely equal; the above requirements are relatively difficult in the existing actual manufacturing technology
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[0043] Hereinafter, embodiments according to the present disclosure will be described in detail with reference to accompanying drawings, so that those skilled in the art can easily understand. The inventive idea described can be implemented in various variations, but should not be limited to these examples. The present disclosure omits descriptions of well-known parts, and the same reference numerals denote the same elements in the present disclosure.
[0044] According to an embodiment of the present disclosure, image 3 Shown is a schematic diagram of a differential pulse amplitude-wavewidth digital-to-analog conversion device (aPWM-DAC) of the present invention. Such as image 3 As shown, the differential pulse amplitude wave width digital-to-analog conversion device includes: a differential pulse amplitude wave width modulation (aPWM) module 310, a power drive module 320, and a filter 330, the aPWM module 310 is connected to a digital The audio input terminal is used fo...
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The invention discloses a differential pulse amplitude wave width digital analog conversion device and a signal coding method thereof. The differential pulse amplitude wave width digital analog conversion device comprises a differential pulse amplitude wave width modulation(aPWM) module, a power supply driving module and a filter; wherein the aPWM module receives an input signal input from a digital audio input end, and the filter is connected to a terminal load, such as a horn; the power supply driving module is connected between the aPWM module and the filter; the aPWM module generates the differential pulse according to the input signal; and the power supply driving module provides energy to the terminal load; and the unnecessary harmonic signal is removed by the filter to reconstruct an analog signal output to the terminal load in the process. The differential pulse amplitude wave width digital analog conversion device disclosed by the invention can make the signal-to-noise ratio of the generated PWM signal higher than 100dB and not affected by circuit processing and connection.
Description
technical field [0001] The present invention relates to a differential pulse amplitude pulse width modulation (amplitude pulse width modulation, aPWM) digital to analog conversion (digital to analog, DAC) device and an encoding method for its output signal, in particular to a method for generating high signal-to-noise ratio (SNR) noise ratio, SNR) aPWM-DAC device, and the output coding for the aPWM-DAC forms a differential signal defined based on the voltage domain and time domain. Background technique [0002] Class D (Class-D) audio amplifier is a switching amplifier, or pulse width modulation (pulse widthmodulation, PWM) amplifier. Class D amplifiers typically provide higher than 90% effective output power compared to 50% effective output power provided by conventional linear amplifiers. In order to obtain a class D amplifier with a high signal-to-noise ratio, a feedback loop is usually included. Figure 1 shows a schematic of a traditional Class D amplifier. Such as f...
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IPC IPC(8): H03M1/82
CPCH03M1/822
Inventor 彭胜铕
Owner TRITAN TECH INC