Dual-channel arbitrary waveform generator based on SOC and generation method

Abstract

The application discloses a dual-channel arbitrary waveform generator based on SOC. The generator comprises the SOC, a storage device, a digital analog converter and an SOC external mounting storage device. According to types, frequencies and phase information of waveforms input in two channels, duplication and phase modulation processing of the wave forms are conducted, so waveform data is generated; and waveform points are generated point by point according to the waveform data, and then waveform point data is output to the digital analog converter point by point. In comparison with the prior art, the waveform data does not need to be recombined during the phase modulation processing; instead, two waveforms with a certain phase relation are acquired through changing of a start address of data reading based on an address offset amount or through abandoning of invalid waveform data based on waveform reference information; the data processing amount of a processor is reduced; and time spent on waveform generation and occupied processor resources are saved. Correspondingly, the application also provides a dual-channel arbitrary waveform generation method based on the SOC.

Description

technical field [0001] The present application relates to the field of signal generators, in particular to a SOC-based dual-channel arbitrary waveform generator and a generating method. Background technique [0002] Traditional arbitrary waveform generators often use DDS technology to generate arbitrary waveforms and frequencies in the form of direct digital synthesis. However, when such arbitrary waveform generators output higher-frequency arbitrary waveforms, there are inherent jitters in the loss of waveform details and cycles. Shortcomings. In order to avoid these disadvantages, some arbitrary waveform generators use point-by-point arbitrary wave technology to output arbitrary waveforms point by point. Under the premise of not losing the details of the waveform, they can output low-jitter waveforms of any length at a variable sampling rate. Rates can vary from microhertz to hundreds of megahertz. Compared with DDS technology, the arbitrary waveform generated by point-b...

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Problems solved by technology

[0004] The waveform jitter generated by such a dual-channel arbitrary waveform generator is low and the sampling rate varies widely. However, due to the use of embedded processors and FPGAs, and the need for multiple memories, the hardware structure is complex and the cost is high; For a waveform with a certain phase relationship, if the waveform data is very long, the embedded processor needs a long time to process the waveform data. In addition, when the user continuously modifies the phase, the embedded processor needs to process the original waveform data every time. Reorganization is time-consuming and takes up a lot of resources of the embedded processor

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