| The pulse signal is widely used in the field of ultra-wideband communications,missile guidance, and laser rangefinder. Pulse signal generator designed by digitalmethod has many advantages than the design by analog methods. In this paper, theFPGA chip as the core components of the pulse signal generator, some parametersof the pulse signal can be flexibly regulated.Based the hardware circuit, it used six panels and the core chip is Altera’sStratix II series EP2S30F672I4. In order to achieve high standards of the pulsesignal, data conversion rates of high-speed DAC is up to250MHz, while, the width,magnitude and frequency of the signal can be adjusted and the accuracy of pulsewidth is up to4ns. All the way, the generator up to four pulse signal outputs whichcan be simulated with pulse signal that influenced by noise according to actualneeds, one channel output can be chosen synchronous or asynchronous with theother three ways. To adjust the amplitude of the pulse signal with addition andsubtraction circuit, it achieves a negative pulse signal output.PC generates pulse signals waveform data source and related parameters withMatlab and transfers data to the FPGA internal registers, or RAM through the USBwith the VC control interface, while achieving the DAC chip and the pulse signaloutput control. Meanwhile, in order to make this signal generator portabilityadvantages in future applications, the design is implemented the ARM controlmodule and the FPGA is mounted on system bus of the ARM core plate. With ARMmodule initially debugged of embedded Linux system, the waveform data in the SDcard can be read through the GUI.The designed board with high-speed circuit needs to consider power integrity,signal integrity, and many other issues, with a detailed note in the high-speed PCBdesign.In the last part of the design of the pulse signal generator, it is provided a verygood experience of designing for future design to test and analyze the resultingerror. |
