Digital-to-analog converter, digital power amplifier subsystem and digital power amplifier system
A digital analog and digital power amplifier technology, applied in the field of circuits, can solve the problems such as the power supply is not clean, affecting voice or music listening, and achieve the effect of improving the noise signal suppression ability, reducing the power supply rejection ratio, and increasing the equivalent impedance
Pending Publication Date: 2019-06-04
SHANGHAI AWINIC TECH CO LTD
View PDF3 Cites 1 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
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
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0045] 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.
[0046] 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.
[0047] Such as figure 1 as sho...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The embodiment of the invention discloses a digital-to-analog converter, a digital power amplifier subsystem, and a digital power amplifier system. The digital-to-analog converter comprises: a first composition branch and a second composition branch; The first composition branch comprises a first switch structure and a first current source, wherein the first switch structure and the first currentsource are connected in series; 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; 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 digital analog converter is applied to a digital power amplifier system, the equivalent output impedance of the digital analog converter is greatly increased, and the power supply rejection ratio of the digital power amplifier system 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...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/26H03F1/56H03F3/185H03F3/217
Inventor 杨志飞张海军姚炜杜黎明程剑涛
Owner SHANGHAI AWINIC TECH CO LTD