A Direct Digital Frequency Synthesizer

Abstract

The invention relates to a direct digital frequency synthesizer capable of synthesizing a high-speed frequency. The direct digital frequency synthesizer comprises a phase accumulation module, a clock frequency division module, a phase shunting module, a phase-amplitude conversion module, a first interlaced sampling module, a digital-analogue conversion module and a second interlaced sampling module, wherein the clock frequency division module divides the frequency of a system clock and outputs the divided frequency; the phase accumulation module performs linear phase addition on a frequency control word under the control of a clock and outputs; the phase shunting module shunts a phase value into multiple paths of the phase values and outputs the phase values to the phase-amplitude conversion module; the phase-amplitude conversion module converts the multiple paths of the phase values into corresponding amplitude values; the first interlaced sampling module samples the amplitude values in an interlaced manner by regarding a frequency division clock as a sampling clock and outputs digital signals; the digital-analogue conversion module converts the digital signals into analogue signals; the second interlaced sampling module samples the analogue signals in the interlaced manner and outputs signals as same as the frequency of the system clock. The high-speed sampling frequency is obtained via a practical low-speed sampling clock, so that the direct digital frequency synthesizer improves the frequency of the output signals and reduces system power consumption.

Description

technical field [0001] The invention relates to the technical field of digital frequency synthesis, in particular to a direct digital frequency synthesizer capable of synthesizing high-speed frequencies. Background technique [0002] Digital frequency synthesis technology is a technology that synthesizes signals of various frequencies required by digital means, and finally converts them into analog signal output through a digital-to-analog converter. This technology has become one of the main technologies in today's frequency synthesis technology due to its unique characteristics: programmable, fast frequency hopping, high resolution, high frequency modulation accuracy, etc. It is widely used in mobile communications, military and commercial radar systems and other communication fields . [0003] With the development of the modern electronics industry and the reduction of semiconductor process size, the development trend of electronic chips is that the integration and speed...

AI Technical Summary

Problems solved by technology

Direct Digital Synthesizer Power Consumption Increases As Frequency Increases

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