Calibration method for digital oscilloscope and 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. It can solve the problems of increasing time cost and cumbersome calibration steps, so as to improve accuracy and save calibration time, the effect of simplifying the correction steps
Active Publication Date: 2021-09-28
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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A calibration method for a digital oscilloscope and a time-interleaved analog-to-digital converter, comprising a reference channel and at least one channel to be corrected, for collecting and quantifying signals input to it and outputting codeword values; a central processing unit outputs each channel to be corrected The codeword value of the reference channel is linearly fitted with the codeword value output by the reference channel to obtain the correction function of each channel to be corrected; the central processing unit also calculates the first configuration value of each channel to be corrected according to the correction function of each channel to be corrected and the second configuration value; the central processing unit also controls the FPGA processor to store the first configuration value and the second configuration value corresponding to each channel to be corrected, so that the FPGA processor is corresponding to the first configuration value and the second configuration value corresponding to each channel to be corrected The second configuration value is to perform gain mismatch correction and offset mismatch correction on each channel to be corrected. The embodiment of the present invention can simultaneously correct the offset mismatch and the gain mismatch, simplify the correction steps, and save the correction time.
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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IPC IPC(8): H03M1/10
CPCH03M1/1009
Inventor 张传民陈报容嘉喜
Owner SHENZHEN CITY SIGLENT TECH