Data Processing Logic Design Of High-speed Acquisition Module

Science can not be separated from the measurement.Oscilloscopes serve as a crucial instrument in the electronic measurement field,contributing significantly to the advancement of electronic information technology.Nowadays,the electronic measurement domain faces a multitude of challenges,including high frequency domains,high bandwidth,and complexity,which renders conventional software processing method based on sequential execution of instructions cannot meet the requirements.As a result,the adoption of digital logic-based high-speed data processing design holds immense practical significance in the field of electronic measurement.This thesis,which is based on the 12.8GSPS digital acquisition system platform,aims to investigate and analyze the logical design and implementation of various modules,including single/dual-channel data fusion,data processing under multiple sampling modes,multi-rate interpolation,multiple triggering functions,storage control,and trigger address lookup related to quantized sampled data.The outcomes will then be examined and verified.The mainly contributes are as follow:1.Data processing in various sampling modes.To eliminate data redundancy and increase processing performance,three sampling modes were developed to extract and process down-converted high-speed sampling data:real-time,peak value,and high-resolution.Implement based on M-path uniform point extraction method in real-time sampling mode;To handle M-channel data points in the high-resolution and peak value sampling modes,a multi-stage serial pipeline structure was used.An approximation search approach was presented to solve the issue of possible mistakes that may emerge owing to low-bit truncation in averaging calculations arising from incomplete sample point accumulation under high-resolution sampling modes.2.Design of a digital trigger and a trigger storage control module.To suppress noise and limit the occurrence of erroneous triggering,a hysteresis comparison interval is used instead of a single-level judgment to achieve digital edge triggering.To properly catch specific anomalous signals,the design employs sophisticated trigger functions such as pulse width trigger and window trigger.The logic design and implementation of modules such as common,automated,single trigger,trigger storage process management,and trigger address search are accomplished in the storage module.3.Design of hardware interpolation module with multiplier.This paper introduces the Fourier interpolation method based on frequency domain processing to achieve interpolation with multiplier.This paper first compares and analyzes the simulation results of linear interpolation,sinc interpolation and Fourier interpolation algorithm,introduces Fourier interpolation method with less resource consumption and better reusability to carry out logic design on the basis of ensuring the interpolation effect.in the logic design,the interpolated data are processed by"overlapping frame"and"sliding average sampling point"for the spectrum leakage caused by non-periodic truncation and the data error caused by the IFFT transformation length of non-2~M.The functionalities of the numerous data processing modules developed for this thesis are normal after testing and verification of each one.