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Method and device for improving non-linear distortion performance of digital-to-analog converter
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A digital-to-analog converter and non-linear distortion technology, applied in the direction of analog/digital conversion calibration/testing, to achieve the effect of improving the performance of non-linear distortion
Inactive Publication Date: 2013-04-03
SHENZHEN JIUZHOU ELECTRIC
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[0009] The technical problem to be solved by the present invention is how to reduce the problem of nonlinear distortion in the digital-to-analog converter
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Embodiment 1
[0024] see figure 1 , the present invention proposes a method for improving the nonlinear distortion performance of a digital-to-analog converter, including:
[0025] S1: Input the zero-phase fundamental frequency digital signal x into N processing units, and each processing unit processes x at the same time to obtain N analog signals containing higher harmonics, which correspond to N processing units There are N different phases, where N is an integer greater than 2 at least;
[0026] S2: adding and summing the N analog signals to obtain a final output analog signal y, in which the fundamental frequency signal has zero phase and the higher harmonic signals are canceled.
[0027] see figure 2 , in this embodiment, the i-th processing unit includes the i-th positive phase shifter, the i-th digital-to-analog converter, and the i-th inverse phase shifter connected in series, and each of the processing units simultaneously processes x details as follows:
[0028] S101: Input ...
Embodiment 2
[0082] see image 3 , the present invention also proposes a device for improving the nonlinear distortion performance of the digital-to-analog converter, including:
[0083] Parallel N-way processing units are used to change the phase of the higher harmonic signal in the output analog quantity of the digital-to-analog converter, and each processing unit changes the higher-order harmonic phase to a different value;
[0084] The summer is configured to sum the analog signals output from the N processing units, so as to retain the fundamental frequency signal in the analog signal and eliminate the high-order harmonic signal.
[0085] Further, each processing unit includes: a positive phase shifter, a digital-to-analog converter, and a reverse phase shifter connected in series in sequence, see Figure 4 .
[0086] Further, the forward phase shifter and the reverse phase shifter in each processing unit shift the input signal with the same phase but opposite signs; the digital-to-...
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Abstract
The invention relates to the field of integrated circuits, in particular to a method and a device for improving the non-linear distortion performance of a digital-to-analog converter. The method includes: inputting a zero-phase fundamental frequencydigital signal x into N-path processing units, and using the N-path processing units for processing the signal x simultaneously to obtain N analog signals including ultraharmonics, wherein the ultraharmonics corresponding to the N processing units have N different phases, and the N is an integer at least larger than 2; and summing up the N analog signals to obtain a final output analog signal y, wherein fundamental frequency signals are in zero phase, and ultraharmonic signals are counteracted. To sum up, by the method and the device, the ultraharmonics generated after digital-to-analog conversion are migrated and processed by the aid of N-path phases prior to being summed up so that pure fundamental frequency signals are obtained, and the non-linear distortion performance is improved effectively.
Description
technical field [0001] The invention relates to the field of integrated circuits, in particular to a method and device for improving the nonlinear distortion performance of a digital-to-analog converter. Background technique [0002] The digital-to-analog converter is a commonly used device in electronic systems. Its function is to convert digital signals into corresponding analog signals. Its transmission characteristics can be expressed as y=kx, where x is the input digital signal and y is the output analog signal. , during the conversion process, due to the non-ideal characteristics of circuit devices, the actual analog signal will be distorted, such as figure 1 As shown, its transmission characteristics can be expressed as: [0003] y=k1x+k2x 2 +k2x 3 +...+knx n ------------------------------Formula 1 [0004] From the perspective of the frequency domain, when a digital signal with a frequency of w is input to the digital-to-analog converter, the actual analog s...
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