基于FPGA的随机采样模数变换模块设计

Design of FPGA-based Random Sampling ADC Module

随机采样技术输入信号频率高、时序要求严格,在采样带宽相同的情况下,可以大幅度降低系统制造成本。文中提出一种基于FPGA的随机采样等效数据采集方法,设计双斜率充放电电路精确确定触发时刻到触发后第一个时钟的时间间隔,给出采集系统硬件实现。测试结果表明:该方法合理展宽了脉冲时间,极大提高了数据采集系统的采样精度。

The benefit of random sampling lies in allowing high frequency of the input signal and low complexity of system framework.So when the sampling band is the same,random sampling method can reduce the total system budget greatly.The rationale of random sample is discussed,and the application of random sampling in the field of modern instrument design,such as wideband radar,digital oscilloscopes,and spectral analyzers is studied,an approach of increasing the data acquisition rate which utilized the merit of advanced FPGA technology is put forward.