A FPGA-based DDS signal generator and its realization method

Abstract

The invention discloses an FPGA (field-programmable gate array)-based DDS (direct digital synthesizer) signal generator. The FPGA-based DDS signal generator comprises an FPGA core controller, a pipelined phase accumulator, a phase / amplitude value lookup table, a digital-to-analog converter and a low-pass filter, wherein the FPGA core controller is used for generating frequency control words K and providing system clock frequency, the pipelined phase accumulator is used for accumulating the inputted frequency control words K, the phase / amplitude value lookup table is used for storing waveform data and converting output results of the pipelined phase accumulator into corresponding waveform amplitude values, the digital-to-analog converter is used for acquiring output results of the phase / amplitude value lookup table and converting the output results into analog signals to output, and the low-pass filter is connected with the digital-to-analog converter and used for outputting final waveform signals. The FPGA-based DDS signal generator has the advantages that by means of subjecting a phase accumulator to pipelined structure improvement, the 32-bit phase accumulator is divided into four-stage pipelines, and the multi-stage pipelines are used for processing inputted data simultaneously to enable operation speed of the phase accumulator to be increased remarkably, so that output frequency of a system is well improved, and the FPGA-based DDS signal generator is stable in performance and low in resource consumption and can be applied to the fields of communication, instrument testing, self-checking systems and the like successfully.

Description

technical field [0001] The invention relates to a waveform generator, in particular to an FPGA-based DDS signal generator and its realization method. Background technique [0002] With the vigorous development of electronic computer technology, especially embedded technology, FPGA (Field-Programmable Gate Array, Field Programmable Gate Array) and DDS (Direct Digital Synthesizer, Direct Digital Frequency Synthesizer) technologies have been extensively developed and application. FPGA has gradually become an extremely advantageous core processor due to its strong parallel processing capability and simple control logic, while DDS technology has become the most important frequency synthesis technology due to its advantages of easy control, high frequency resolution and fast frequency conversion speed. . [0003] The structure of the existing DDS signal generator is relatively complex, the working speed is relatively slow, and it is not suitable for the current high-speed develo...

AI Technical Summary

Problems solved by technology

[0003] The structure of the existing DDS signal generator is relatively complicated, the working speed is relatively slow, and it is not suitable for the current high-speed development of computer science and technology.

Images