Digital oscilloscope and correction method of time-interleaved analog-to-digital converter
A technology of analog-to-digital converter and digital oscilloscope, which is applied in the directions of analog-to-digital conversion, analog/digital conversion calibration/test, code conversion, etc., which can solve the problems of cumbersome calibration steps and increased time cost, so as to save calibration time and improve Accuracy, the effect of reducing the time of correction
Active Publication Date: 2021-08-13
SHENZHEN CITY SIGLENT TECH
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Problems solved by technology
However, under the existing technology, offset mismatch and gain mismatch are usually corrected separately in the digital-analog hybrid correction method, which makes the correction steps more cumbersome and increases the time cost of correction
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[0070] The present invention will be further described in detail below through specific embodiments in conjunction with the accompanying drawings. Wherein, similar elements in different implementations adopt associated similar element numbers. In the following implementation manners, many details are described for better understanding of the present application. However, those skilled in the art can readily recognize that some of the features can be omitted in different situations, or can be replaced by other elements, materials, and methods. In some cases, some operations related to the application are not shown or described in the description, this is to avoid the core part of the application being overwhelmed by too many descriptions, and for those skilled in the art, it is necessary to describe these operations in detail Relevant operations are not necessary, and they can fully understand the relevant operations according to the description in the specification and genera...
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The present invention provides a digital oscilloscope and correction method of a time-interleaved analog-to-digital converter. The digital oscilloscope comprises a reference channel and at least one channel to be corrected, and is used for collecting and quantifying a signal input into the channel and outputting a code word value; the central processing unit carries out linear fitting on the code word values output by all the channels to be corrected and the code word values output by the reference channel, and correction functions of all the channels to be corrected are obtained; the central processing unit also calculates a first configuration value and a second configuration value of each to-be-corrected channel according to the correction function of each to-be-corrected channel; and the central processing unit also controls the FPGA processor to store the first configuration value and the second configuration value corresponding to each to-be-corrected channel, so that the FPGA processor performs gain mismatch correction and detuning mismatch correction on each to-be-corrected channel according to the first configuration value and the second configuration value corresponding to each to-be-corrected channel. According to the embodiment of the invention, maladjustment mismatch and gain mismatch can be corrected at the same time, correction steps are simplified, and correction time is saved.
Description
technical field [0001] The invention relates to the technical field of oscilloscopes, in particular to a digital oscilloscope and a correction method for a time-interleaved analog-to-digital converter. Background technique [0002] A digital oscilloscope is a high-performance oscilloscope manufactured by a series of technologies such as data acquisition, analog-to-digital conversion, and software programming. Through the acquisition, processing and calculation of the signal, the user can directly observe the measured signal in the time domain. Analog-to-digital converter, referred to as ADC, is a core electronic component in a digital oscilloscope. Key indicators such as the vertical resolution, bandwidth, sampling rate, signal-to-noise ratio, and effective number of bits (ENOB) of the analog-to-digital converter have a decisive impact on the measured signal, and also determine the grade and price of the digital oscilloscope. Due to the limitation of semiconductor technolo...
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CPCH03M1/1009
Inventor 张传民陈报容嘉喜
Owner SHENZHEN CITY SIGLENT TECH