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The design and implementation of fractional divider;

实用小数分频器的设计与实现

Compare to Integral Frequency, the virtue of Fractional-N Frequency is little Phase Noise.

小数分频锁相源相对整数分频锁相源的最大优势就是相位噪声性能好,能满足系统的要求。

This article is primarily to discuss the fractional-N frequency (F-N) synthesizer technique s principle, the reason for low-frequency spurs, the use of spur reduction by DAC; thoroughly to describe the ∑- modulation technique by phase noise shaping; and finally to point out the development tendency of F-N frequency synthesizer.

本文主要介绍了小数分频(F-N)频率合成技术的原理,相位杂散的原因,采用AD/数模转换的补偿方法,重点论述了比较新颖的基于∑—Δ调制的F-N频率合成技术,并指出了F-N频率合成技术的发展趋势。

After analyzing and researching the basic theory of fractional-N synthesis and the methods to suppress the fractional spurs,this paper designs a high performance fractional-N divider based on sigma-delta modulation technique with FPGA which is flexible and good for general purpose.

在分析研究小数频率合成的基本原理及其杂散抑制技术方法上,基于通用灵活的设计思想,采用FPGA集成技术设计了一种基于-Δ调制技术的高性能小数分频器,利用该分频器实现的频率合成器,频率范围800~1 200 MHz,频率分辨率达到nHz量级,偏离主频10 kHz处单边带相位噪声优于-105 dBc/Hz,应用于某高纯微波合成信号发生器中,获得了令人满意的效果。

This article introduces the theory of Fractional-N synthesis based on Σ-Δ modulation technique,and analyses the theory and control method of quadruple modulus in Fractional-N divider.

本文介绍了基于Σ-Δ调制技术的小数分频频率合成的基本原理,对四模分频的原理和控制方法进行了分析讨论,最后采用FPGA实现了Σ-Δ调制小数分频器四模分频控制,该方案应用到某Σ-Δ调制小数分频频率合成器中,获得了良好的相位噪声。

A High Resolution Sigma-Delta Fractional-N Frequency Synthesizer

一种高分辨率∑△小数分频频率合成器

Design of Frequency Scanner Based on Delta-Sigma Fractional-N PLL LMX2471

基于小数分频数字锁相环LMX2471的扫频仪设计

Analyze and Eliminate the Fractional Spur of Σ-ΔModulator Fractional Divider

∑-△调制小数分频中小数杂散的分析与消除

Design of Decimal Fraction Frequency DividerBased on FPGA Technology

基于FPGA的小数分频法的研究与设计

Design of Odd and Decimal Frequency Divider Circuit Based on LUT

基于查找表LUT结构的奇数与小数分频电路设计

Study of a New Project of Realizing Fractional Frequency Based on ∑-△ Modulation;

一种新的实现∑-△调制小数分频方案的研究

Fractional Frequentcy-division and its Application in SATCOM

小数分频技术及其在卫星通信中的应用

The Charge Pump's Influence on Phase Noise of Fractional-N PLL

电荷泵对小数分频锁相环相位噪声的影响

An Algorithm of the Blind Digital Audio Watermarkjng Based on Energy Analysis of Wavelet Coefficient

基于小波系数能量分析的数字音频盲水印算法

Design and Simulation of the Fractional-N PLL Frequency Synthesizers Based on Simulink;

基于Simulink的小数-N分频锁相频率合成器设计与仿真

Study of Fractional-N Digital Phase Locked Loop Frequency Synthesizer;

分数分频数字锁相频率合成器的研究

2D Interpolating Wavelets、Multifrequency Multifunctions Wavelets Nonharmonic Wavelets and Wavelets-Based Solutions to ODE;

二元插值小波、多频率多函数小波、非调和小波及微分方程的小波方法

The vibrating frequency of the quartz crystal in the electronic watch is counted by the circuits to make the hour, minute and second.

电子表中的石英晶体的振荡频率是由线路计数来定小时、分和秒。

When we decomposed them using wavelet, the LLband sometimes can as big as CIF.

对于大画面的视频序列,小波变换分解的层数不能太多。

Audio Watermarking Technique Based on SVD_DWT;

基于奇异值分解和小波变换的音频数字水印研究

Research of Digital Audio Watermarking Algorithm Based on Cepstrum Analysis and Wavelet Transform;

基于倒谱分析和小波变换的数字音频水印算法研究

A Study on Audio Frequency Data s Condensation and Modulation Communication Based on Wavelet Analysis;

基于小波分析的音频数据压缩及调制通信的研究

High-Frequency Financial Data Calendar Effects Wavelet Neural Network Analysis;

高频金融数据“日历效应”的小波神经网络模型分析