| The dynamic signal analysis module is a device that can combine the functions of signal acquisition,signal generation and signal processing and analysis to realize dynamic signal analysis.It has been widely used in aerospace,electronic communications,remote sensing,mechanical measurement,and vibration testing.In various fields such as acoustic analysis,it plays an extremely important role in modern scientific research.The paper analyzes and studies the dynamic signal acquisition module,and proposes the design function index according to the demand.The overall design plan is given.In order to accomplish the requirements of high precision and large dynamic range,the noise affecting the key performance and indicators o f the module is analyzed and studied,including the analysis of the source and type of noise,and the noise model in the operational amplifier circuit.Study of noise calculation methods.Finally,according to the requirements of the function index,the de tailed hardware design of the high-precision dynamic signal acquisition equipment is completed.The module is mainly composed of a data acquisition circuit,a signal generation circuit,an FPGA control and memory circuit,a clock,and a power supply circuit.The main work of this article is as follows:1)According to the input signal design index,this paper uses a Sigma-Delta ADC to complete the data acquisition circuit design,and analyzes the noise of the signal conditioning circuit in the design,and designs a signal conditioning circuit scheme that meets the noise requirements.2)According to the output signal design index,and combined with the overall design requirements,the FPGA+DAC design scheme was used to complete the signal generation circuit design,and a signal generation circuit that satisfies the requirements was designed.3)According to the logic function requirements,the design of the ADC/DAC interface and control logic,PXI interface logic,channel control logic,and signal generation logic is mainly completed.Through the flexible configuration of each module,FPGA can meet the relevant functional requirements.4)According to the different power requirements of different circuits,the power requirements of the module and the influence of the power supply ripple on the circuit are analyzed.A low-ripple power supply circuit is designed and the power supply design is reasonable from the viewpoint of the ripple size and the power consumption.Analyzed.After completing the hardware circuit and logic design of the entire system,this article also verified the power supply,data acquisition circuit,signal generation circuit functions and indicators in the module,and proved the feasibility of the design. |
