High speed arbitrary waveform generator based on FPGA

Abstract

This invention relates to one high speed random wave generator based on FPGA, which adopts DDS technique with data sample rate more than 1GHz and comprises CPU, parallel data phase generation part, wave shape memory part, plug and filter part, parallel and series conversion circuit and DAC, wherein, the parallel data phase generation adopts parallel process to generate multiple data phase In one time clock to get multiple data; then it uses FPGA series and parallel conversion circuit to output the data to DAC into virtual volume.

Description

technical field [0001] The invention relates to a waveform generator, in particular to a FPGA-based high-speed arbitrary waveform generator. Background technique [0002] The arbitrary waveform generator based on DDS (Direct Digital Synthesis) technology uses high-speed memory as a look-up table, and synthesizes the waveform stored in the memory through high-speed DAC. So it can not only generate common waveforms such as sine, cosine, square wave, triangle wave and sawtooth wave, but also can use various editing methods to generate truly arbitrary waveforms that cannot be generated by traditional function generators. [0003] Although there are many kinds of structures of the DDS system, its basic circuit principle can be expressed in Figure 1. [0004] DDS technology is based on the sampling theorem. It first samples the waveform to be generated, digitizes the sampled value and stores it in the memory as a lookup table, then reads the data through the lookup table, and con...

AI Technical Summary

Problems solved by technology

However, the operating frequency of the digital circuit can only reach a few hundred MHz, that is to say, the operating frequency of the data phase generation circuit and the waveform memory is far below the operating frequency of the DAC.

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