| In many high-speed signal testing fields,such as radar,communication and integrated circuits,measurement and analysis instruments are not only required to have high index,multi-functional technical performance,but also require the equipment to be portable and lightweight to adapt to a variety of test environments.However,the traditional desktop digital oscilloscope has high performance,but it has the disadvantages of large volume,heavy and high cost,and can not adapt to the field test.Therefore,in order to provide a multifunctional comprehensive test solution for electronic system analysis in small space,multi-parameter and high flexibility,this paper designs a portable high-speed signal oscilloscope analyzer based on USB 3.0.It not only has a 2GHz acquisition bandwidth,6.4GSPS real-time sampling rate,and 12 bit vertical resolution acquisition performance.It also has the functions of arbitrary waveform generation,automatic low power regulation,multi-machine synchronization and small and lightweight body design.The main research contents of this paper are as follows:1.Complete the system scheme and hardware circuit design.Aiming at the performance indexes and functional requirements of the system,the system scheme with ADC+FPGA+DAC as the core structure is established.Through the comprehensive consideration of acquisition performance,power consumption,volume,cost and other factors to complete the system core device selection,according to which the ADC conversion,data processing,data communication and other schemes and circuit design.Compact circuit structure and controllable power management circuit are designed for portable and low power consumption.2.Complete data acquisition and waveform generation logic design.JESD204 B IP core is configured on the receiving end of FPGA to establish a transmission link,and the high-speed acquisition data of 8 channels and 12.8Gb/s is received and analyzed.The bidirectional data communication structure is designed to achieve efficient and stable data interaction between FPGA and host computer.Based on the DDS principle,an arbitrary waveform generator is designed,a polynomial piecework fitting algorithm is used to correct the output amplitude,and an arbitrary wave triggering function is designed to expand the testing ability of oscilloscope analyzer.Finally,a dynamic low power management method based on function matching is designed to meet the power design requirements of the whole machine below 35 w.3.Complete the design of oscilloscope analyzer multi-machine synchronization system.A multi-chip synchronization algorithm is designed to realize master slave clock system synchronization,and an error estimation and adjustment model is proposed to correct the multi-machine clock skew problem.Based on the two-stage triggering scheme,the triggering structure of master-slave control is proposed,and the synchronization and correction design of trigger control signal can meet the requirement of ±100ps.The design of adjusting data delay is proposed to solve the metastable problem of data transmission.Finally,the system indexes and design functions of the oscilloscope analyzer are tested and verified.The test results show that the oscilloscope analyzer has achieved the highest real-time sampling rate of 6.4GSPS,analog bandwidth of 2.2GHz,arbitrary wave bandwidth of 110 MHz,multi-machine synchronization accuracy of ±80ps and other design indexes and portable body.The core index is higher than that of Keyside P924 x A series USB oscilloscope,which is the latest product of the same type,and has completed the research goal of high-level oscilloscope analyzer. |
