Research And Implementation Of Digital Storage Oscilloscope System Based On Zynq-7000

Digital storage oscilloscope(DSO),as a common electronic measuring instrument,is a kind of digital graphic display device which uses analog-to-digital converter(ADC)to complete the acquisition,storage and reconstruction of analog signals.With the improvement of the demand for sampling rate and resolution of analog signal,the bandwidth of data transmission,the capacity of sample storage and the speed of waveform reconstruction become the important research direction to improve the comprehensive performance of DSO.However,to improve the system performance is often at the cost of increasing system power consumption and system volume.Using high integrated Zynq-7000 heterogeneous processing platform as the main control core of DSO system can effectively solve the contradiction between DSO system performance,power consumption and portability,and this design architecture has strong engineering application value and certain academic research significance.The main conducted research work and achievements in this dissertation are expounded as follows:1.By analyzing the data flow direction and multi clock domain of DSO system,the hardware of DSO system is divided into three subsystems: data acquisition,large capacity storage and liquid crystal display(LCD)control according to the basic principle and architecture of DSO.A fast and flexible software and hardware co-design method of DSO system based on Zynq-7000 heterogeneous processor is proposed.2.The working principle and mechanism of data acquisiton by ADC are studied and analyzed.Based on the strong expansibility of Zynq-7000 platform,the data acquisition and transmission methods of parallel CMOS interface ADC,serial and parallel lowvoltage differential signaling(LVDS)interface ADC and multi-chip ADC cascade structure is discussed in this thesis,and a general data acquisition and transmission scheme based on Zynq-7000 processor is proposed.3.By analyzing the high-speed random data storage mode of Zynq-7000 and combining the advantages of high bandwidth communication between the processor and the programmable logic,the method of cascading small capacity first input first output(FIFO)storage is innovated.By using this method,the traditional annular data storage structure is improved and transplanted to the heterogeneous processor to realize the large capacity data storage and transmission interface.4.By using the design method of intellectual property integrator(IPI),a lightweight LCD controller architecture is designed.For the first time,a software system which combines Free RTOS real-time operating system and u C/GUI user graphic interface has been successfully deployed on Zynq-7000 heterogeneous system.The tasks of data transmission,control,storage and waveform display have been divided and implemented,and the communication between tasks is realized.In this thesis,a software design method of digital storage oscilloscope system with low hardware coupling is proposed.At the end of this thesis,the parallel CMOS interface ADC of 60 MSPS sampling rate is taken as an example.In the test of the whole system,by optmizing the measuring circuit and software drivers,the DSO system with the frequency parameter measuring error better than 10-6,the voltage parameter measuring error better than 4%,sample storage depth up to 32 Mpts,liquid crystal display speed up to 90frame·s-1 and power consumption less than 10 W is realized.The results and conclusions of this thesis indicate a kind of heterogeneous embedded signal processing and display system for high-speed and large bandwidth mixed signals,which has the advantages of high performance,low power consumption,strong scalability and low material cost.