DDS signal generator and waveshape memory depth control method thereof

Abstract

The invention relates to a DDS signal generator and a waveform storage depth control method thereof. The depth of the waveform storage space is set according to the length of the waveform data, and the waveform data is stored in the waveform storage space of the corresponding depth; one of the waveform storage spaces The waveform data is stored externally in a certain order; the length of the externally stored waveform data is obtained; the phase address of the next waveform data point is accumulated according to the phase address of the initial waveform data point of the externally stored waveform data; according to the length of the waveform data, The phase address is mapped to the address of the waveform data stored externally; the waveform data stored externally is processed by digital-to-analog conversion to construct a waveform output. It is used to reconstruct a memory depth control mechanism that does not distort the waveform and can make full use of the storage space according to the number of arbitrary waveform sampling points, which can meet the requirements of storing more short waveforms and meet the requirements of storing long waveforms .

Description

technical field [0001] The present invention relates to signal generator technology, in particular to the control of waveform storage depth of Direct Digital Frequency Synthesis (DDS: DirectDigital Frequency Synthesis) signal generator, specifically a DDS signal generator and its waveform storage depth control method. Background technique [0002] Such as figure 1 As shown, the overall architecture of a DDS signal generator generally includes a man-machine interface, a waveform memory, a frequency synthesis unit, a waveform control unit and an analog unit. The waveform memory stores the sampling points within a waveform period; the frequency synthesis unit generates different waveform phase transformation points according to the frequency setting, and extracts the sampling point amplitude of the corresponding phase from the waveform memory; the waveform control unit controls the amplitude of the waveform. Offset and other related parameters; the analog unit reconstructs the...

AI Technical Summary

Problems solved by technology

Moreover, for arbitrary waveforms, the internal waveform storage space provided by the DDS signal generator for users is a fixed-length waveform storage space. For arbitrary waveforms whose waveform sampling points are less than this length, a storage space has to be occupied, which is very important. wasteful

However, for arbitrary waveforms larger than this length, they cannot be stored in one storage space, which causes a huge waste of storage space due to the inability to utilize the remaining storage space, and cannot meet the storage requirements for arbitrary waveforms of different lengths.

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