Broadband low-stepping high-speed frequency synthesizer based on DDS (Direct Digital Synthesizer) and PLL (Phase Locked Loop)

A frequency synthesizer, high-speed technology, applied in the field of radar communication, can solve problems such as poor stability, poor output signal quality, complex structure, etc., and achieve the effect of good stability, high precision and improved quality

Inactive Publication Date: 2015-12-02
ANHUI SUN CREATE ELECTRONICS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When the existing frequency synthesizer has a high output frequency or a wide bandwidth, the quality of the output signal is poor. At the same time, the structure of the existing frequency synthesizer is complex and the stability is not good, so it needs to be improved urgently

Method used

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  • Broadband low-stepping high-speed frequency synthesizer based on DDS (Direct Digital Synthesizer) and PLL (Phase Locked Loop)
  • Broadband low-stepping high-speed frequency synthesizer based on DDS (Direct Digital Synthesizer) and PLL (Phase Locked Loop)
  • Broadband low-stepping high-speed frequency synthesizer based on DDS (Direct Digital Synthesizer) and PLL (Phase Locked Loop)

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Embodiment Construction

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0032]A wideband low-step high-speed frequency synthesizer based on DDS and PLL, including DDS circuit, PLL circuit, up-conversion and signal amplification circuit 30, timing control circuit; the signal output terminal of the PLL circuit is connected with the up-conversion and The signal input end of the signal amplification circuit 30 is connected, the signal input end of the frequency conversion and signal amplification circuit 30 is connected with the signal...

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Abstract

The invention discloses a broadband low-stepping high-speed frequency synthesizer based on a DDS (Direct Digital Synthesizer) and a PLL (Phase Locked Loop). The frequency synthesizer comprises a DDS circuit, a PLL circuit, an up-conversion and signal amplification circuit and a time sequence control circuit, wherein the signal output end of the PLL circuit is connected with the signal input end of the upper-conversion and signal amplification circuit; the signal input end of the up-conversion and signal amplification circuit is connected with the signal output end of the DDS circuit; and the signal output end of the time sequence control circuit is connected with the signal input ends of the PLL circuit and the DDS circuit. According to the broadband low-stepping high-speed frequency synthesizer, L-band and KU-band local oscillations are generated through the PLL circuit in a large bandwidth and combined with a DDS frequency respectively, and frequency switching is realized through a high-speed switch combination method. An output frequency is on a KU band; frequency hopping of 10MHz stepping can be finished rapidly when an output bandwidth is 12-14GHz; and the overall frequency switching time is up to 2 microseconds. The broadband low-stepping high-speed frequency synthesizer has the characteristics of simple structure, high stability, high accuracy, easiness in implementation and the like.

Description

technical field [0001] The invention belongs to the technical field of radar communication, in particular to a broadband low-step high-speed frequency synthesizer based on DDS and PLL. Background technique [0002] There are three types of frequency synthesis: direct analog frequency synthesis, phase-locked frequency synthesis and direct digital synthesis. With the continuous development of radar technology and communication technology, higher requirements are put forward for the frequency stability, spectrum purity, frequency range and frequency agility speed of the frequency synthesizer. The existing frequency synthesizer has poor output signal quality when the output frequency is high or the bandwidth is wide. At the same time, the structure of the existing frequency synthesizer is complicated and the stability is not good, so it needs to be improved urgently. Contents of the invention [0003] In order to overcome the above-mentioned deficiencies in the prior art, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03L7/18
Inventor 毛飞鲁长来倪文飞汪炜
Owner ANHUI SUN CREATE ELECTRONICS
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