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FPGA-based DDS random waveform signal generator

A signal generator and arbitrary waveform technology, applied in the field of digital electronics, can solve problems such as user inconvenience, increased cost, and inability to optimize spectrum, and achieve the effect of convenient control operation and strong versatility

Inactive Publication Date: 2014-07-30
HANGZHOU DIANZI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing signal generators realize arbitrary waveforms through online generation and downloading. This method adds an additional arbitrary waveform module (download interface), which increases the cost and brings inconvenience to users.
And it just simply realizes signal reproduction, and cannot make a good optimization of the spectrum

Method used

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  • FPGA-based DDS random waveform signal generator
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  • FPGA-based DDS random waveform signal generator

Examples

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Embodiment Construction

[0034] Such as figure 1 Shown, a kind of DDS arbitrary waveform signal generator based on FPGA of the present invention, whole system on chip comprises an embedded phase-locked loop, bit width is 10 two data selectors, bit width is 8 four data selections Accumulator, the first accumulator A with a bit width of 32 bits, the second accumulator B with a bit width of 32 bits, on-chip ROM_triangular wave, on-chip ROM_square wave, on-chip ROM_sine wave, on-chip RAM_arbitrary wave, scrambling code generator and NIOS II core.

[0035] Such as figure 2 As shown, the embedded phase-locked loop has 5 ports, including an input terminal CLK and four output terminals, and the four output terminals are C0, C1, C2, and C3. The CLK of the embedded phase-locked loop is directly locked to the off-chip Clock; the output terminal C0 of the embedded PLL is connected to the SYSTEM_CLK interface of the Nios II core, and the output interface C1 of the embedded PLL is connected to the clock pin of t...

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Abstract

The invention discloses an FPGA-based DDS random waveform signal generator. The random wave form realization mode of a conventional signal generator is online generation and downloading. A random waveform module is additionally arranged in such a mode, as a result, the cost is increased and inconvenience is brought to users. The conventional signal generator can merely realize signal reproduction and cannot well optimize a frequency spectrum. In the FPGA-based DDS random waveform signal generator, a whole system-on-a-chip comprises an embedded phase-locked loop, a one-out-of two data selector with a bit width of ten, a one-out-of-four data selector with a bit width of eight, a first accumulator A with a bit width of thirty two, a second accumulator B with a bit width of thirty two, a ROM_triangular wave on a chip, a ROM_square wave on a chip, a ROM_sine wave on a chip, a ROM_random wave on a chip, a scrambling generator and an NIOSII core. The FPGA-based DDS random waveform signal generator has the advantages of high versatility, simple control operation, and frequency spectrum optimization.

Description

technical field [0001] The invention belongs to the technical field of digital electronics, and in particular relates to an FPGA-based DDS arbitrary waveform signal generator. Background technique [0002] Digital signal generators currently on the market mainly use Direct Digital Synthesizer (DDS) technology. Direct Digital Synthesizer (DDS) is an advanced all-digital frequency synthesis technology, which has a variety of digital modulation capabilities. (such as phase modulation, frequency modulation, amplitude modulation and I / Q quadrature modulation, etc.), compared with traditional frequency synthesizers, DDS has the advantages of low cost, low power consumption, high resolution and fast conversion time. [0003] Signal generators are widely used in production practice and in the field of science and technology. Using digital methods, various types of waveforms can be easily realized, such as rectangular waves (including square waves), sine waves, and various modul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K3/02
Inventor 周明珠刘小强王栋
Owner HANGZHOU DIANZI UNIV
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