Adaptive incremental modulation analog-to-digital converter with calibration circuit and calibration method
A technology of incremental modulation and calibration circuit, applied in analog/digital conversion calibration/test, analog/digital conversion, code conversion, etc. Harmonic distortion ratio, simple calibration method, and low circuit overhead
Active Publication Date: 2022-06-21
SHENZHEN JINGYANG ELECTRONICS CO LTD
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[0016]
In order to solve the defects of the high cost of the calibration method based on the analog circuit and the complexity of the calibration circuit, the present invention proposes an adaptive incremental modulation analog-to-digital converter including a calibration circuit and a calibration method, which is a digital digital converter based on a lookup table. Calibration circuit and calibration method avoiding the cost, performance, and reliability deficiencies of analog calibration circuits by using digital calibration
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[0053] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention. In addition, it should be further emphasized here that the preferred technical solutions provided by the following specific embodiments can be used in cooperation with each other or in combination.
[0054] In view of the problems existing in the prior art, the present invention adopts a calibration look-up table, sets the corresponding value of In[3] input by the DAC to 1000, and transforms it into the digital value corresponding to 0.51V in the dig...
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The invention relates to a self-adaptive incremental modulation analog-to-digital converter with a calibration circuit and a calibration method, and the analog-to-digital converter comprises an error comparison and summation circuit which is used for comparing and subtracting an input analog signal and a feedback signal to obtain an error signal; a loop filter for receiving the error signal; the comparator is used for judging the amplified error signal; the self-adaptive incremental encoder is used for carrying out self-adaptive incremental encoding and decoding according to a judgment result of the comparator; a digital-to-analog converter for converting the digital signal into an analog signal; the calibration lookup table is used for storing a group of input and output corresponding relations, inputting a number and outputting a numerical value corresponding to the number; and the down-sampling and digital filter is connected with the calibration lookup table and is used for reducing the sampling rate and filtering the signal. According to the invention, the digital-to-analog converter can be calibrated, so that the calibration of the adaptive incremental modulation analog-to-digital converter is realized.
Description
technical field [0001] The invention relates to a calibration circuit and a calibration method of an analog-to-digital converter, in particular to an adaptive incremental modulation analog-to-digital converter including a calibration circuit and a calibration method. Background technique [0002] Due to the limitation of the existing production process, the digital-to-analog converter inevitably has a certain mismatch error, so that the output analog signal and the input digital signal are not completely consistent correspondence, which brings digital / analog. Converter (DAC) error. [0003] Patent Document 1 discloses a DAC error measurement method and apparatus. This scheme measures and calibrates the error in the feedback DAC by using a known signal excitation, such as a square wave, DC, or some fixed frequency signal, by measuring the known excitation signal. The calibration method in this scheme is to complete the calibration by correcting and adjusting the analog DAC....
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IPC IPC(8): H03M1/10H03M1/08H03M1/06
CPCH03M1/1019H03M1/0854H03M1/0614
Inventor 杨少军高东兴
Owner SHENZHEN JINGYANG ELECTRONICS CO LTD