Digital-to-analog converter, digital power amplifier subsystem, digital power amplifier system
A digital analog and digital power amplifier technology, applied in the field of circuits, can solve the problems of affecting the voice or music hearing, the power supply is not clean, and the signal-to-noise ratio becomes low, so as to reduce the power supply rejection ratio, improve the noise signal suppression ability, and reduce the noise. Effect of Small Power Supply Rejection Ratio
Pending Publication Date: 2019-04-23
SHANGHAI AWINIC TECH CO LTD
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Problems solved by technology
[0005] However, in some application systems, the power supply is often not very clean, and there are power supply ripples of different frequencies. If the power supply rejection ratio (PSRR) of the audio power amplifier chip is not good enough, the audio noise on the power supply will pass through the audio power amplifier chip. Transmitted to the speaker, causing irritating audio noise, affecting speech or music listening
Especially in the case of a small input signal amplitude, if the intrinsic noise floor of the digital power amplifier system is very large, the signal-to-noise ratio (SNR) of the digital power amplifier system will be reduced, resulting in the output of the digital power amplifier system There is a creaking background noise in the voice, which affects the sense of hearing
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[0058] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0059] In the following description, a lot of specific details are set forth in order to fully understand the present invention, but the present invention can also be implemented in other ways different from those described here, and those skilled in the art can do it without departing from the meaning of the present invention. By analogy, the present invention is therefore not limited to the specific examples disclosed below.
[0060] Such as figure 1 as sho...
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The embodiment of the invention discloses a digital-to-analog converter (DAC), a digital power amplifier subsystem, and digital power amplifier system. The DAC comprises a first composition branch anda second composition branch; the first composition branch comprises a first switch structure and a first current source in serial connection; the first current source comprises a fourth resistor, a first field effect transistor, a second field effect transistor, and a second operational amplifier; the second composition branch comprises a second switch structure and a second current source in serial connection; the second current source comprises a fifth resistor, a third field effect transistor, a fourth field effect transistor, and a third operational amplifier; when the DAC is applied to the digital power amplifier system, the equivalent output impedance of the DAC is greatly increased, and a power supply rejection ratio of the digital power amplifier is reduced.
Description
technical field [0001] The invention relates to the field of circuit technology, in particular to a digital-to-analog converter, a digital power amplifier subsystem, and a digital power amplifier system. Background technique [0002] Digital power amplifiers have the advantages of low distortion, low noise, large dynamic range and strong anti-interference ability, etc., and their advantages in terms of sound quality transparency, resolution, background tranquility and low-frequency shock are greatly superior to traditional analog power amplifiers and class D power amplifiers. [0003] With the update of consumer products such as DVD home theaters, mini audio systems, set-top boxes, personal computers, LCD TVs, flat panel displays, and mobile phones, especially the emergence of new audio specifications with high sampling frequencies such as SACD and DVD Audio, and audio The evolution of the system from stereo to multi-channel surround system has accelerated the development of...
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IPC IPC(8): H03F1/26H03F1/56H03F3/185H03F3/217
CPCH03F1/26H03F1/56H03F3/185H03F3/217
Inventor 杨志飞张海军姚炜杜黎明程剑涛
Owner SHANGHAI AWINIC TECH CO LTD