A digital-to-analog converter and a digital power amplifier subsystem

Abstract

The invention provides a digital-to-analog converter and a digital power amplifier subsystem, The clock feed-through effect and the channel charge injection phenomenon generated by a first switch, a second switch, a third switch and a fourth switch of the digital-to-analog converter during the switching process are not loaded in the output signal of the digital-to-analog converter by acrossing thefirst current source and the second current source. The invention avoids the adverse effects of clock feed-through effect and channel charge injection phenomenon caused by the first switch, the second switch, the third switch and the fourth switch on the output signal of the digital-to-analog converter in the switching process, so that the sizes of the first switch, second switch, the third switch and the fourth switch are not limited, a larger size switch tube may be used as the first switch, the second switch, the third switch, and the fourth switch to solve the problem that the first current source and the second current source operate in the linear region due to excessive voltage drops consumed by the first switch, the second switch, the third switch, and the fourth switch.

Description

technical field [0001] The present invention relates to the technical field of semiconductor integrated circuits, and more specifically relates to a digital-to-analog converter and a digital power amplifier subsystem. Background technique [0002] The digital power amplifier has the characteristics of low distortion, low noise, large dynamic range, and strong anti-interference ability. Its advantages in sound quality transparency, resolution, background tranquility, and low-frequency shock are greatly superior to traditional analog power amplifiers and class D power amplifiers. With the rapid development of consumer products such as DVD home theater, mini audio system, set-top box, personal computer, LCD TV, flat panel display and mobile phone, especially the emergence of new audio specifications with high sampling frequency such as SACD and DVD Audio, and The evolution of audio system from stereo to multi-channel surround system has accelerated the development of digital po...

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Problems solved by technology

[0005] In view of this, the present invention provides a digital-to-analog converter and a digital power amplifier subsystem, to solve the problem that the size of the switching tube in the digital-to-analog converter can only be designed to be small, which affects the performance of the digital-to-analog converter. The problem of adverse effects

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