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A high-precision random frequency hopping DDS frequency synthesizer

A frequency synthesizer, high-precision technology, applied in the field of signal sources, can solve problems such as difficulty in achieving random and fast frequency hopping, and achieve the effect of realizing fast frequency hopping, improving performance, and improving frequency accuracy

Active Publication Date: 2019-03-08
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, a variety of communication countermeasures and radar countermeasure systems with different performances are being used one after another, and random frequency hopping is also particularly important. Generally, DDS supports linear fast frequency sweep with low frequency accuracy, and it is difficult to achieve high-precision random fast frequency hopping

Method used

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  • A high-precision random frequency hopping DDS frequency synthesizer
  • A high-precision random frequency hopping DDS frequency synthesizer
  • A high-precision random frequency hopping DDS frequency synthesizer

Examples

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Embodiment Construction

[0031] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0032] This embodiment provides a high-precision random frequency hopping DDS frequency synthesizer, its circuit block diagram is as follows figure 1 As shown, including FPGA main control module, DDS chip, PLL reference source module, power management module, low-pass filter, host computer, temperature sensor;

[0033] The power management module is responsible for supplying power to other modules;

[0034] The PLL reference source module generates a 3.5GHz reference signal with low spurious and low phase noise, which is input to the DDS chip through a single-ended to differential balun NCS1-422+;

[0035] Inside the DDS chip, the reference signal is divided by 24 as the reference clock output of the FPGA main control module; in the logical part of the FPGA main control module that controls the DDS chip, a reference clock signal is required, and the cl...

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Abstract

The invention discloses a high-precision random frequency hopping DDS frequency synthesizer, belonging to the technical field of signal sources. The synthesizer of the invention comprises a FPGA maincontrol module, a DDS chip, a PLL reference source module, a power management module and a low-pass filter. The synthesizer of the invention can quickly obtain the required frequency control word, reduce the frequency hopping time to 100 nanoseconds, greatly improve the performance, and realize the random frequency hopping by realizing the pseudorandom ordinal number in the FPGA, adopts a programmable modulation mode of DDS chip AD9914 to improve frequency accuracy. The frequency control word needs to be updated is calculated faster, the number of registers is reduced, and the control word issent down through the parallel port to realize the fast frequency hopping. By using an LFSR linear feedback shift register to generate a pseudorandom number, the random frequency point is calculated,and the random frequency control word is obtained by FPGA internal operation, so that the random frequency hopping is realized.

Description

technical field [0001] The invention belongs to the technical field of signal sources, is applied in microwave signal sources and radar systems, and in particular relates to a high-precision random frequency hopping DDS frequency synthesizer. Background technique [0002] Microwave signal generation technology has experienced the development process from analog to digital and analog hybrid. At present, microwave frequency sources with high performance and complex functions rely more and more on digital control technology. Programmable logic devices (FPGA) are used to realize the control of microwave frequency synthesizers. Complex and flexible working modes can be realized. At present, digital frequency synthesis technology is widely used in local oscillators of receivers, signal generators, communication systems, radar systems, etc., especially in frequency hopping communication systems. [0003] At present, the performance requirements of frequency synthesizers in microwa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F1/02H03L7/18
CPCH03L7/18G06F1/022
Inventor 杨青慧王家敏郑仁平张怀武张晓东
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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