频率变换

KTP晶体电光效应及非线性光学频率变换技术的研究

Research on the Electro-Optic Effect and Nonlinear Optical Frequency Conversion Technology of KTP Crystal

新型光学晶体KABO的非线性频率变换特性

Properties of Nonlinear Frequency Conversion in a New Optical Crystal KABO

基于DSP的AD频率变换的研究与实现

The Research and Realization of AD Frequency Transformation Based on DSP

采用简单PWM原理单相三线瓦特/频率变换器及准确度分析

A Single-phase Three-Wire Watt to Pulse Frequency Converter Using Simple PWM and Its Accuracy Analysis

为了保证当频率变换时，电流能够相应地变化，在控制电路中，采用PI调节器以获得恒定的电磁力矩。

In order to make circuit varies with frequency , we adopt PI adjuster to gain changeless electromagnetic moment in control circuit .

因此，采用AD器件和数字滤波器技术实现混频等频率变换功能，是一种比较先进和新颖并且实际可行的方法。

Therefore , taking advantage of AD device and digital filtering technique to realize mixing and other frequency transformation function is a comparatively advanced , novel and practical method .

TES系统中的频率变换及有关参数的设置

Frequency Converting and Parameter Configuration in the TES System

产生可实现变化压频比、实时频率变换的SPWM波形。

A series of SPWM waveform signals where the voltage frequency ratio and frequency can be changed real time is then achieved .

采用Veriloghdl实现了高低通滤波器，乘法器，数字&频率变换器等模块，并对整个计量部分进行仿真验证。

In the measurement part , filter 、 multipliers 、 digital-frequency converter counter modules are realized and simulated by the Verilog HDL .

本文提出采用AD和DSP软件编程的方法实现信号的混频功能，作为AD和数字滤波器实现频率变换的一个典型应用。

In the paper , we advanced the method of mixing function by means of AD and DSP software programming , which is a typical application of frequency transformation with AD and digital filter .

首先，给出了传统Chebyshev滤波器的基本理论、频率变换和设计方法，作为本文的理论基础；

As the fundamental of this thesis , the synthesis and design of the conventional Chebyshev filters and frequency transformation method are introduced .

在所有现代雷达和无线通信系统中，广泛需要VCO（压控振荡器）以提供载波发生和频率变换。

VCOs ( voltage controlled oscillators ), for carrier generating and mixing , are widely used in wireless communication and radar system .

本文提出一种基于电压频率变换（V／F）的数字相敏检测方法。这种方法可对被检测信号进行矢量分析。

Based on voltage to frequency ( V / F ) conversion a method for digital phase sensitive detection ( DPSD ) is proposed in this paper , by which a vector analysis of detected signals can be achieved .

准相位匹配（QPM）技术是一种获得高的非线性频率变换效率的相位匹配技术。

The quasi-phase-matched ( QPM ) technology is a phase-matched technology which can get high efficiency of non linear frequency change .

利用准相位匹配（QPM）技术在光学超晶格中实现特定的可实用化的激光频率变换，在目前是一个富有实际意义和挑战性的课题。

Utilizing Quasi-phasematched ( QPM ) technique to achieve a given useful laser frequency conversion is a practical and challenging topic .

混频器是射频前端电路中进行频率变换的十分重要的模块，主要介绍了CMOS混频器的基本工作原理，实现混频的一些常见结构，这些结构的优缺点。

Mixer is an important building block in RF frontend to achieve frequency translation . the basic operating principle of CMOS mixer is introduced , the mixer structures in common use are presented , along with theirs virtue and shortcomings .

最新研究发现利用腔长仅为相干长度的光学微腔也可以用来补偿非线性频率变换过程中的位相失配，这就是所谓的腔位相匹配（CPM）。

Besides , the sub-coherence-length micro-cavity can also compensate to the phase mismatching in the process of nonlinear frequency conversion with high efficiency , which is the so-called cavity phase matching ( CPM ) .

本文利用数字梯形滤波器的设计原理，以离散微分器作为积木块，利用频率变换方法，设计出数字LDD梯形高通滤波器。

Based on the design fundamental of digital LDI ladder filter , a digital LDD ladder high-pass filter is designed by using the frequency transformation in this paper .

随着大功率LD输出功率不断提高，新型激光晶体、非线性晶体以及使用准相位匹配方式的光学超晶格材料的不断研究开发、频率变换技术的日臻成熟，全固态激光器成为激光器的主流发展方向。

With the development of high power laser diode , new laser crystals , nonlinear optical crystals , optical superlattice with quasi-phase-match and the maturation of optical frequency conversion technology all-solid-state laser has become a central of focus in the field of laser .

将基本的混合参数二端口网络通过阻抗变换和频率变换，在变换域中成为无耗广义单位元件，应用Richards定理可以方便地综合混合集总分布参数网络。

By means of impedance transformation and frequency transformation the mixed lumped distributed two ports networks become generalized unit elements , so the mixed lumped distributed networks can be synthesized conveniently on the basis of Richards theory .

本文主要分析了实现固体RGB激光光源的非线性频率变换技术，实现了固体RGB激光光源的研制，分析了RGB激光光源在激光电视技术方面的应用。

In this paper , non-linear frequency transformation technology is analyzed , solid-state RGB lasers are made , the application of RGB lasers on laser TV are introduced . There are mainly five parts in this paper as the following .

介绍了多功能双向光纤传输平台（HFC）的系统方案、硬件实现和实验结果，整个系统包括上行光端机、下行光端机、频率变换器、频谱监测器、射频调制解调器以及网络管理软件。

This paper proposes the scheme , hardware implementation and experiment result of HFC . The system is composed of upward and downward channel optic transmission equipments , shifting frequency equipment , monitoring spectrum equipment , modulator / demodulator and network management software .

然后采用正交数字上变频（DUC）技术进行基带信号数字域调制和频率变换。

Then , a solution based on Digital Up Converter ( DUC ) was proposed , which implemented the conversion of a complex digital baseband signal to a real passband signal .

准相位匹配技术（QPM）是非线性光学频率变换领域中的一个重要组成部分，以其转换效率高、调谐方式灵活的特点受到众多科学家的青睐。

Quasi-phase matching ( QPM ) technique is an important component in nonlinear optical frequency conversion . It aroused the interests of scientists due to the advantages of high conversion efficiency and flexible tuning methods .

近些年来，随着半导体微电子技术、超快激光技术以及非线性光学频率变换技术的飞速发展，与THz辐射和THz波导相关的THz波技术逐渐成为国际研究的热点。

In recent years , with the speedy development of semiconductor-microelectronic technology , super fast laser technology and nonlinear optical frequency conversion technology , THz wave technology in relation to the THz radiation and THz waveguide gradually become a hot topic of in research field all over the world .

BIBO（BiB3O6）晶体是一种新型的非线性光学晶体，物化性能稳定、光损伤阈值高，并且具有相当大的非线性光学系数，可以制作成频率变换器件，获得高效的倍频激光输出。

BIBO ( BiB_3O_6 ) crystal is a novel nonlinear crystal , which has stable physical and chemical properties , high destroy threshold , and big nonlinear effective coefficient , so BIBO crystal can be used as frequency conversion device to obtain efficient second harmonic wave generation .

利用频率变换和频率合成技术，将电信时钟信号频率转换为1MHz整数频率，再利用现有的频标比对器，实现电信时钟信号频率和频率稳定性的高准确度测量。

Using frequency transformation and frequency synthesis techniques , we transferred electric commumication clock signal to 1 MHz integer frequency . realized high accuracy measurement of electric communication clock signal frequency and frequency sta - bility utilizing existent frequency comparator again .

采用电导-频率变换测量方法的电导率仪

Design of a conductivity meter based on conductivity-frequency conversion measurement method

基于二分频率变换的序列相似性查询处理技术

A Sequence Similarity Query Processing Technique Based on Two-Partitioning Frequency Transformation

全固态激光及非线性光学频率变换技术

All Solid State Laser and Nonlinear Optical Frequency Conversion Technology