DDS (direct digital synthesis) type ultra-wide band frequency-modulated signal generating circuit and method

A frequency modulation signal and generation method technology, applied in the direction of electrical components, automatic power control, etc., can solve the problem that the output signal frequency is not high enough, and achieve the effect of high resolution

Inactive Publication Date: 2012-11-14
WUHAN BINHU ELECTRONICS
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  • DDS (direct digital synthesis) type ultra-wide band frequency-modulated signal generating circuit and method
  • DDS (direct digital synthesis) type ultra-wide band frequency-modulated signal generating circuit and method
  • DDS (direct digital synthesis) type ultra-wide band frequency-modulated signal generating circuit and method

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[0023] A DDS directly formed ultra-wideband frequency modulation signal generating circuit and method, characterized in that: Figure II Shown as a block diagram of the structure of the system, the system is mainly composed of clock input, phase lock source, ultra-wideband DDS, waveform parameter control, amplification filtering and mixing filtering. The input end of the clock input is connected to an external clock, one output end is connected to the reference clock end of the phase lock source, and the other is connected to the clock input end of the waveform parameter control circuit. The system clock output terminal of the phase lock source is connected to the system clock input terminal of the ultra-wideband DDS. The control signal output terminal of the waveform parameter control circuit is connected with the control signal input terminal of the ultra-wideband DDS. The waveform output terminal of the ultra-wideband DDS is connected with the input terminal of the amplifyin...

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Abstract

The invention belongs to the technical field of radar wideband frequency synthesis and in particular relates to an ultra-wide band frequency-modulated signal generating method which is based on the combination of wideband DDS (direct digital synthesis) and an analog frequency synthesis technique. According to the invention, a wideband DDS chip is used for directly generating a wideband linear frequency-modulated, non-linear frequency-modulated or special phase-coded signal, and waveform signal parameters can be configured online by an upper computer. A radio frequency microwave band datum reference signal is generated by utilizing an analog phase-locked loop and a frequency synthesis technique, and the wideband linear frequency-modulated, non-linear frequency-modulated or special phase-coded signal and the radio frequency microwave band datum reference signal are combined by virtue of frequency spectrum shifting, thus an ultra-wide band frequency-modulated signal with low spur, low phase noise and high resolution is generated, a microwave direct frequency synthesizer with high resolution and low phase noise is realized and is simple in structure and easy to integrate.

Description

technical field [0001] The invention belongs to the technical field of radar broadband frequency synthesis, and in particular relates to an ultra-wideband frequency modulation signal generation method based on the combination of broadband DDS and analog frequency synthesis technology. Background technique [0002] With the development of modern electronic countermeasures technology, the target electromagnetic environment we need to deal with is becoming more and more complex. Radar must further improve the capabilities of multi-target detection, anti-jamming, high resolution, multi-environment adaptation and target recognition. One of the key technologies to improve these performances is to use pulse frequency modulation signals with a large time-width-bandwidth product, which is an important condition for realizing high-resolution measurement of multiple targets and completing target classification and recognition. The generation of this ultra-wideband signal can adopt tech...

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Application Information

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IPC IPC(8): H03L7/18
Inventor 徐晓李建垚苑凤雨辛鹏
Owner WUHAN BINHU ELECTRONICS
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