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L-band frequency synthesizer circuit

A frequency synthesizer, L-band technology, applied in the direction of electrical components, automatic power control, etc., can solve the problems of large circuit phase noise, complex circuit composition, etc., and achieve the effect of poor stability, reliable performance, and low power consumption

Inactive Publication Date: 2015-05-27
TIANJIN 764 COMM AIRMANSHIP
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is exactly to overcome the deficiencies in the prior art, aiming at problems such as existing circuit phase noise is big, circuit composition is complicated, provides a kind of design scheme of L-band frequency synthesizer circuit: 1, by selecting integrated VCO chip for use, the output frequency The phase noise is greatly reduced, the frequency output stability is improved, and the circuit complexity is reduced

Method used

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Embodiment Construction

[0011] The present invention will be further described below in conjunction with the accompanying drawings:

[0012] like figure 1 As shown, an L-band frequency synthesizer circuit includes a phase locked loop circuit (PLL), a loop filter, a voltage controlled oscillator (VCO), a frequency setting control circuit and a reference frequency source circuit, the frequency setting control circuit and the reference frequency The source circuits are respectively connected with a phase-locked loop circuit, the phase-locked loop circuit is connected with a loop filter, the loop filter is connected with a voltage-controlled oscillator, and the voltage-controlled oscillator is connected with the phase-locked loop circuit.

[0013] This circuit utilizes a reference frequency source, generates a large number of frequency combinations through the harmonic generator mixing and frequency division, and then locks the VCO frequency at a certain frequency with a phase-locked loop, and the VCO in...

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Abstract

The invention discloses an L-band frequency synthesizer circuit, which is used for a tacan earth station and DME equipment. According to the design, the L-band frequency synthesizer circuit comprises a phase-locked ring circuit, a loop filter, a voltage controlled oscillator, a frequency setting control circuit and a reference frequency source circuit, wherein the frequency setting control circuit and the reference frequency source circuit are respectively connected with the phase-locked ring circuit, the phase-locked ring circuit is connected with the loop filter which is connected with the voltage controlled oscillator, and the voltage controlled oscillator is connected with the phase-locked ring circuit. By adopting an improved circuit design scheme, the L-band frequency synthesizer circuit which is advanced in technology, stable in working, reliable in performance, small in volume and low in power consumption can be finally designed, so that the problems of being poor in stability, difficult to debug, poor in phase noise index of the existing circuit can be solved, and the wide working band demand of tacan and DME equipment can be met. In addition, the volume of the circuit is reduced, and the cost is lowered.

Description

technical field [0001] The invention relates to an electronic digital communication system, in particular to an L-band frequency synthesizer circuit, which is used on the TACAN ground station and DME equipment. Background technique [0002] In modern communication systems, the frequency stability and accuracy of the equipment are very high. For a communication system working in a wide frequency band, not only high frequency stability and accuracy are required, but also the frequency can be changed conveniently and quickly. TACAN and DME (Distance Measurement Equipment) devices have wide operating frequency bands and need to meet these requirements. [0003] Due to the limitations of technology and components, the existing L-band frequency synthesizer circuit has the following problems: 1. The voltage-controlled oscillator (hereinafter referred to as VCO) built with separate components leads to unstable output frequency and large phase noise. 2. Using an active loop filter ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03L7/18
Inventor 刘新强徐敬舟张升华
Owner TIANJIN 764 COMM AIRMANSHIP
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