Adaptive digital audio pre-distortion in an audio digital to analog converter
a digital to analog converter and adaptive technology, applied in the field of audio signal processing, can solve the problems of increasing cost, complicating the construction of the system, adversely affecting the linearity of the digital audio system response, etc., and achieve the effect of improving the overall linearity of the delta-sigma dac system
Active Publication Date: 2010-09-23
TEXAS INSTR INC
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Benefits of technology
The present invention is about improving the accuracy of a Delta-Sigma DAC system by using an adaptive digital pre-distortion block. This block can change the pre-distortion transfer function either statically or dynamically, or both, using programmable registers. The invention can be implemented in digital components and can cancel out device nonlinearities, resulting in a more linear output. The technical effect of the invention is to improve the accuracy of the DAC system and produce a more linear output.
Problems solved by technology
Design of digital audio systems involves a number of trade-offs that result in the system having certain characteristics that are beneficial and certain characteristics that are less desirable.
In particular, the DAC component may adversely affect the linearity of the digital audio system response because of nonlinearities within the DAC component.
However, manufacturing these types of resistors require additional processing steps that complicates their construction and increases cost.
Additionally, nonlinearities may be introduced during the manufacturing process.
Method used
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[0012]The detailed description set forth below in connection with the appended drawings is intended as a description of various embodiments of the invention and is not intended to represent the only embodiments in which the invention may be practiced. The detailed description includes specific details for the purpose of providing a thorough understanding of the invention. However, it will be apparent to those skilled in the art that the invention may be practiced without these specific details. In some instances, well known structures and components are shown in block diagram form in order to avoid obscuring the concepts of the invention.
[0013]Embodiments of the present invention relate to an adaptive digital pre-distortion block that is used to cancel device nonlinearities to improve the overall linearity of a Delta-Sigma DAC system. In particular, the pre-distortion block may be implemented all in digital components and utilize programmable registers that change the pre-distortion...
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An adaptive digital pre-distortion block is used to cancel device nonlinearities to improve the overall linearity of a Delta-Sigma DAC system. In particular, the pre-distortion block may be implemented all in digital components and utilize programmable registers that change the pre-distortion transfer function either statically or dynamically, or both. Static changes can be for variation in process corners during production, whereas, dynamic changes can be used to correct nonlinear changes that can occur from environmental reasons such as voltage, temperature, aging and device stress.
Description
BACKGROUND[0001]1. Field[0002]The present invention relates generally to audio signal processing and, more particularly, to digital to analog converters.[0003]2. Description of Related Art[0004]Design of digital audio systems involves a number of trade-offs that result in the system having certain characteristics that are beneficial and certain characteristics that are less desirable. For example, the range of the system can be sacrificed to allow for simpler circuit designs. Also, device size can be minimized by sacrificing other parameters depending on the desired characteristics of the system. One component of a digital audio system that affects its performance is the digital to analog converter (DAC). In particular, the DAC component may adversely affect the linearity of the digital audio system response because of nonlinearities within the DAC component.[0005]A DAC typically includes a stage that converts a current to an analog voltage using an operational amplifier and a feedb...
Claims
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IPC IPC(8): H03M1/66G06F17/00
CPCH03M3/50H03M3/388
Inventor KIPER, HALILRAMASWAMY, SRINATH MATHURBURRA, GANGADHAR
Owner TEXAS INSTR INC