DAC circuit device with micro-pulse wave absorption function

Abstract

The invention discloses a DAC circuit device with a micropulse wave absorption function, which comprises: a DAC module, the DAC module has an output end; a filter capacitor, the filter capacitor is connected in parallel to the output end; a micropulse wave discharge module, the micro-pulse wave discharge module is connected in parallel with the filter capacitor, and the micro-pulse wave discharge module is used to discharge the micro-pulse wave generated by the filter capacitor. The DAC circuit device of the present invention can absorb micro-pulse waves with a shorter time interval than nanoseconds and microseconds, and effectively improve the EMC performance of the DAC circuit system, especially in the audio field to improve sound quality and eliminate digital sounds in the audio field. Meaning, the timbre of the sound is softened and the resolution is improved.

Description

technical field [0001] The invention relates to the technical field of signal transmission, in particular to a DAC circuit device with a micro-pulse wave absorption function. Background technique [0002] In a common DAC circuit, due to the additional parameters such as inductance, high-frequency skin resistance, and DC resistance at the pin of the filter capacitor used for signal smoothing, in the case of a sudden change in the charge and discharge current due to data changes or internal structural defects of the DAC , the voltage across the filter capacitor will appear a pulse wave. Due to various reasons such as conductor skin effect, conductor surface defects, absorbing device speed, etc., the pulse wave cannot be well absorbed in the very short time (such as picosecond and femtosecond interval) at the beginning, which is a widespread phenomenon. It is a typical EMI (Electro Magnetic Interference, electromagnetic interference) problem in the DAC circuit. [0003] The s...

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Problems solved by technology

[0003] The spectrum analysis method based on Fourier transform is easy to ignore this kind of pulse wave which may not appear frequently but has extremely high-frequency properties locally, because it is difficult for traditional instruments to capture it in nanoseconds and picoseconds. area, so the usual power supply ripple evaluation system does not consider its existence in this area at all.

In fact, the ability of the conventional circuit to suppress the AC ripple of the power supply gradually decreases with the increase of the frequency, so it is necessary to pay enough attention to its harm.

[0004] At present, in the field of high-frequency circuits and audio which are extremely sensitive to such pulse waves, the understanding and treatment of this problem is even more blank.

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