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Broadband fine-step frequency synthesis circuit and method

A frequency synthesis circuit and fine-stepping technology, applied in the direction of electrical components, automatic power control, etc., can solve problems such as difficulty in upgrading, and achieve the effect of reducing frequency steps, expanding working bandwidth, and increasing output frequency.

Active Publication Date: 2022-02-18
SOUTHWEST CHINA RES INST OF ELECTRONICS EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This solution has the characteristics of broadband fine stepping, but the phase noise is determined by the noise floor of the phase detector in the phase-locked loop, which is difficult to improve

Method used

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  • Broadband fine-step frequency synthesis circuit and method
  • Broadband fine-step frequency synthesis circuit and method
  • Broadband fine-step frequency synthesis circuit and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Embodiment 1: as figure 1 As shown, a broadband fine-step frequency synthesis circuit includes a reference unit, an intermediate frequency unit, a local oscillator unit, and a spread spectrum unit. The reference unit generates a low-noise reference signal and then inputs it to the intermediate frequency unit and the local oscillator unit. The intermediate frequency unit generates a broadband intermediate frequency The signal is realized in the local oscillator unit to output the low phase noise local oscillator signal, and the input end of the spread spectrum unit is connected to the output of the local oscillator unit and the output of the intermediate frequency unit.

[0055] This embodiment adopts comb line cascading and direct combination to realize low phase noise local oscillator; uses DDS+ phase-locked loop to realize fine-step broadband intermediate frequency; efficiently expands working bandwidth by means of frequency mixing, interpolation filling, frequency ban...

Embodiment 2

[0056] Embodiment 2: On the basis of Embodiment 1, the reference unit includes a first comb generator, a power divider, and a filter ,filter ; The low phase noise reference signal provided by the first comb generator input crystal oscillator , yielding a step of The low additional noise broadband comb spectrum signal, the comb spectrum signal is divided into two and passed through the filter respectively ,filter , to extract the first low-noise reference signal , the second low noise reference signal .

Embodiment 3

[0057] Embodiment 3: On the basis of Embodiment 1, the intermediate frequency unit includes a DDS, a phase detector, a loop filter, a voltage-controlled oscillator, and a directional coupler; the first low-noise reference signal Input DDS, select DDS low spurious performance section as the input of phase detector; phase detector, loop filter, voltage controlled oscillator and directional coupler constitute a phase locked loop, and the output signal generated by voltage controlled oscillator Prescaled in the phase detector, and the very fine step signal generated by DDS Real-time phase comparison to control the output frequency of the voltage-controlled oscillator; cooperate with the adjustment of DDS and PLL settings to generate low-spurious, fine-step broadband IF signals, and the IF coverage frequency band is .

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Abstract

The invention discloses a broadband fine-step frequency synthesis circuit and method, and relates to the technical field of frequency synthesis, and the broadband fine-step frequency synthesis circuit comprises a reference unit, an intermediate frequency unit, a local oscillator unit and a spread spectrum unit. The reference unit generates low-noise reference signals, and the output end is connected with the signal input end of the intermediate frequency unit and the signal input end of the local oscillator unit. The intermediate frequency unit generates fine-stepping broadband intermediate frequency signals, and the output end of the intermediate frequency unit is connected with the signal input end of the spread spectrum unit. The local oscillator unit generates low-phase noise local oscillator signals, and the output end of the local oscillator unit is connected with the signal input end of the spread spectrum unit. The local oscillator signals and the intermediate frequency signals are mixed in the spread spectrum unit, and the output of the spread spectrum unit is the output of the frequency synthesis circuit. According to the invention, comb line cascade connection and direct combination are adopted to realize low-phase noise local oscillation; a DDS + phase-locked loop is adopted to realize fine stepping broadband intermediate frequency; the working bandwidth is efficiently expanded by means of frequency mixing shift, interpolation filling, frequency band splicing and the like, and cross-octave broadband fine-step frequency synthesis is realized.

Description

technical field [0001] The present invention relates to the technical field of frequency synthesis, and more specifically, to a broadband fine-step frequency synthesis circuit and method. Background technique [0002] Frequency synthesis technology is widely used, and it is an important functional component of heterodyne and superheterodyne frequency conversion systems, and is the core unit of modern electronic information systems such as communication and interference. The development of modern electronic information technology puts forward higher and more comprehensive requirements on the performance index of the frequency source, and the frequency synthesis technology with broadband and fine steps has become the main research direction and development trend. [0003] Frequency synthesis technology includes phase-locked loop frequency synthesis technology, direct digital frequency synthesis technology (DDS) and direct frequency synthesis technology. [0004] Phase-locked ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03L7/083H03L7/085H03L7/093H03L7/099
CPCH03L7/083H03L7/085H03L7/093H03L7/099
Inventor 赵翔刘武广陈昌锐张文锋周广晏王燕金广华陈睿苏梦蜀陈远林
Owner SOUTHWEST CHINA RES INST OF ELECTRONICS EQUIP
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