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Low-spurious/low-phase noise frequency synthesizer

A technology of frequency synthesizer and frequency synthesizer, applied in automatic control of power, electrical components, etc., can solve problems such as fractional spurs, and achieve the effects of low spurious, fast switching speed, and fast frequency switching speed

Active Publication Date: 2018-11-02
10TH RES INST OF CETC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But it also has a very fatal flaw in itself, that is, there are fractional spurs, so the frequency divider is the key point and difficulty in the design of the frequency synthesizer

Method used

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  • Low-spurious/low-phase noise frequency synthesizer
  • Low-spurious/low-phase noise frequency synthesizer

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Embodiment Construction

[0012] refer to figure 1 . The low spurious / low phase noise frequency synthesizer can be divided into two parts: the reference signal generating unit and the phase-locked mixing unit, the phase-locked mixing unit is connected to the DDS signal link of the reference signal generating unit, the harmonic generation link, It is composed of a phase-locked mixing link and an amplification and filtering link connected in series in series with the DDS signal link, wherein the harmonic generation link is connected in parallel to the phase-locked mixing link. The phase-locked mixing link contains loops, and the mixing phase-locked link contains figure 2 The phase detector shown is a loop composed of a voltage-controlled oscillator VCO. The reference signal generation unit takes the externally received 10MHz reference input signal frequency as a unified reference frequency, uses the DDS output signal as the reference signal of the phase-locked loop PLL through the DDS signal link, and...

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Abstract

The invention discloses a low-spurious / low-phase noise frequency synthesizer, and aims at providing the frequency synthesizer which is thin in stepping, low in spurious signal, low in phase noise, stable and reliable in work and fast in frequency switching speed. The low-spurious / low-phase noise frequency synthesizer is implemented by the technical scheme as follows: a reference signal generationunit uses an externally received reference input signal as unified reference frequency, the reference frequency uses an output signal of a DDS as a reference signal of a phase-locked loop (PLL) via adirect digital frequency synthesizer (DDS), and output frequency is controlled through changing a frequency control word of the DDS. The signal output by the DDS is fed into a phase-locked frequency mixing unit after being subjected to frequency multiplication for two times to be subjected to phase-locked frequency mixing with a local oscillator signal generated by a harmonic generation link at the phase-locked frequency mixing unit, the phase-locked frequency-mixing signal passes through an amplifying and filtering link and is filtered by a band-pass filter to acquire the needed local oscillator signal.

Description

technical field [0001] The invention relates to a low phase noise and low spurious frequency synthesizer mainly used in radio frequency microwave circuits such as radar reconnaissance, aerospace measurement and control, and wireless communication, especially a low phase noise with an output frequency of 3950MHz-4150MHz and a step of 1kHz. Low spurious frequency synthesizer. Background technique [0002] Frequency synthesis technology is an important technology in electronic system design. Its indicators such as phase noise, output spurious, frequency conversion time and frequency resolution often directly determine the performance of the entire system. The spurious performance directly affects the dynamic range and detection capability of the receiving system. In the field of communication, a low spurious signal source is an important guarantee for reducing the bit error rate and improving system sensitivity. The fast switching time of the signal source can improve the spee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03L7/18H03L7/085H03L7/099
CPCH03L7/085H03L7/099H03L7/18H03L2207/12
Inventor 华林
Owner 10TH RES INST OF CETC
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