Hardware Design And Implementation Of Multifunctional Virtual Oscilloscope Module

In recent years,with the increasing complexity of the system under test,the performance and function of traditional oscilloscopes have been difficult to meet the requirements of modern electronic measurement.Domestic and foreign oscilloscope manufacturers mostly rely on continuous improvement of performance indicators to maintain competitiveness,but correspondingly will increase the cost of research and development.At the same time,the increasingly complex test environment and special test objects also put forward higher requirements for the functional diversity of oscilloscopes.The purpose of this paper is to study the expansion of the functional diversity of traditional digital oscilloscopes.Based on virtual instrument technology,the separation of acquisition system and human-computer interaction is realized on the basis of digital oscilloscope architecture.Wi-Fi and USB,computer and mobile terminal resources are fully utilized in today's life,and waveform processing and display are implemented in terminal devices,which can greatly reduce the cost of instruments.Improve the flexibility of the instrument.At the same time,by improving the hardware circuit and adding engineering code,the functions of waveform generator,frequency meter and other instruments are realized.Based on the multi-functional virtual oscilloscope project,this paper focuses on the following aspects:1.Design of the overall structure of the system.According to the design requirements of miniaturization,low cost,low power consumption and high flexibility of the system,the overall control structure of the system "FPGA + ARM" is determined by comparing and selecting the core components,based on the traditional oscilloscope architecture scheme,and the system can be divided into multiple different modules according to the concept of virtual instrument.2.Design of data acquisition system.The design of data acquisition system includes the design of sampling circuit,data preprocessing and caching,and related control module.Sampling circuit mainly completes the analog-to-digital conversion of signal.Data pre-processing and caching are mainly used to complete sampling,combining and storage of sampled data.Control module can realize channel control,triggering and time-based functions.3.Design of arbitrary waveform generator.In order to increase the diversity and flexibility of the system,the function of arbitrary waveform generator is realized by expanding the hardware circuit and modifying the program code,following the waveform synthesis control structure of "ARM + FPGA".Finally,it can achieve multiple waveform output and fast and stable frequency switching.4.Battery power management.According to the power supply demand of the system,the battery management circuit and high efficiency voltage conversion circuit are designed.Battery management circuit takes charge chip as the core to realize charging control of lithium batteries,and real-time monitoring and display of battery power.High-efficiency voltage conversion circuit combines system power-on sequence and power switch control to complete multi-channel DC voltage conversion for load supply.5.Dynamic management design of system power consumption.Starting from the calculation and analysis of the power consumption composition of the whole machine,according to the different working conditions of the system,the power consumption dynamic management of each module of the system is realized by using hardware and software control.