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模拟小信号电能表的应用及其检测技术
优质期刊推荐为满足卫星测控业务的要求、完成C频段遥测信号的接收工作，本课题研制了C频段下变频器。
The subject derives from the project of "C-band Down Converter" , which is contented with the satellite testing and controlling system.
通过对数字下变频器HSP50216内部结构、工作原理及性能特点的介绍，给出了其在下变频处理中的应用。
By discussing the inside structure, the working principle and feature of the digital down converter HSP50216 and its use in down-conversion process were given.
介绍了软件无线电的基本思想及结构，提出了一种基于可编程数字下变频器HSP50214B的中频软件无线电接收系统的设计方案。
The basic concept and architecture of software radio is introduced in this paper. And a type of software radio receiver based on programmable digital down converter(DDC)-HSP50214B is presented.
下变频器；
Digital down converter;
介绍了可编程数字下变频器件HSP5 0 2 1 4B内部结构及其在全数字接收机中的应用。
This paper presents the architecture and application of the programmable digital down-converter HSP50214B.
数字下变频器（DDC）是数字接收机的重要部件，而数字振荡器（NCO）又是影响数字下变频性能的关键器件。
Digital down converter(DDC) is a vital device of digital receiver and numerically controlled oscillator(NCO) also is a key device that influences the DDC's function.
基于直接下变频的系统架构，接收机集成了低噪声放大器、I/Q下变频器、去直流偏移滤波器、基带放大器和信道选择滤波器。
Based on a direct-conversion architecture, the receiver integrates LNA, I/Q mixer, DC-offset removal filter, baseband amplifier and channel-select filters on a single chip.
在宽带数字接收机中，高速数据流的实时处理对后继数字下变频器性能提出了极为苛刻的要求。
The real time processing of high speed data flow makes strict demands on the performance of descendant digital down converter in the wideband digital receiver.
从而有可能避免使用专用硬件下变频器，使硬件电路更简化和增加系统的灵活性。
This will avoid using special hardware of digital down converter, make hardware simpler and increase the flexibility of system.
能否以艾默生CT的变频器产品为例，谈一下变频器与传动产品在功能以及技术上未来的发展趋势？
Can you please use Emerson CT drives f instance, sharing with us the future drives developing trend in terms of technology and feature?
在此基础上，提出了数字下变频技术在可编程数字下变频器HSP50214B中的应用方案。
On the base of these, the paper analyzes applications of digital down converting in the HSP50214B programmable downconverter.
提出了一种高效数字下变频器（DDC）实现方法。
An improved efficient implementation method of digital down converter(DDC) in radio monitoring receivers is presented.
数字下变频器（DDC）是数字接收机的重要部件，而数字振荡器（NCO）又是影响数字下变频性能的关健器件。
Digital Down Conerter (DDC) is a vital device of digital receiver and Numerically Controlled Osillator( NCO) also is a key device that influences the DDCs function.
另外，下变频器通过引入在片偏置环路，极大地提高了该下变频器的对称性和线性度。
Moreover, in the down-converter the on-chip biased loop is used, which could improve the symmetry and linearity of the down-converter.
另外证实了对上、下变频器以及低噪放大器采取恒温措施的必要性。
In addition, we approve that temperature control to Up-converter, Down-converter and Low noise amplifier is very important and necessary.
对于混频器、级联积分梳状滤波器和数字下变频器都给出了仿真波形。
The simulation wave of mixer, CIC filter and DDC were all shown.
在软件方面，主要介绍了数字下变频器的参数设置、接收系统的应用软件设计以及系统核心芯片ADSP2191的监控软件设计。
In the software design, the parameter setting of digital down converter, the application program of this receiving system and the design of ADSP2191"s monitoring program are mainly introduced."
能否以艾默生CT的变频器产品为例，谈一下变频器与传动产品在功能以及技术上未来的发展趋势?。
Can you please use Emerson CT drives for instance, sharing with us the future drives developing trend in terms of technology and feature?
模块的硬件设计主要包括：A／D转换器、数字下变频器（DDC）以及DSP，详尽讨论了A／D 器件AD6640和DDC 器件AD6624的设计和应用；
The design of hardware module includes A/D converter, DDC (Digital Down Converter) and DSP. The design and application of AD6640 and AD6624 are fully discussed in this part.
完成通用数字下变频器系统的电路设计及硬件实现；
Complete design of the circuit and the hard-ware realization of the whole system;
此设计方案集CIC滤波器、HB滤波器和多相滤波器的优点于一身，使设计出的数字信号下变频器能够处理更高频率的信号。
The DDC can process higher frequent digital signal because it takes advantage of CIC filter, HB filer and multiphase-filter.
并采用FIR滤波器的多相结构改进下变频器的性能。
One polyphase structure of FIR filter is used to improve the performance of DDC.
最后给出了FPGA实现的数字下变频器在测试中产生的波形和频谱，作了测试结果分析。
At the end of this paper, waves and spectra generated by FPGA DDC during tests are given and test results are analyzed.
对这种参量下变频器作了小信号分析，导出了变频器的增益条件，稳定工作条件及谐振条件。
A small signal analysis is conducted, giving the conditions for conversion gain, for stable operation and for resonance.
对空载、带载情况下变频器产生的不平衡电压和高次谐波的含量进行了测试与分析。
Reference to research status of MDT and by analyzing the special working environment of the ESP, the multi-signal are carried with motor power line.
全数字化接收机是实现软件无线电技术的重要基础，本文研究基于可编程四通道数字下变频器HSP5 0 2 16实现高频地波雷达数字接收机设计的若干关键技术。
The fully digitalized receiver is the important basis for software radio. Some key technologies about how to realize the HF ground wave radar receiver based on the HSP50216 are addressed.
基于射频CMOS集成电路技术，设计出用于超宽带无线通信系统的CMOS下变频器。
Based on CMOS Radio-Frequency Integrated Circuit technology, the CMOS RF down-converter circuit for UWB wireless communication system is developed.
本文完成的主要工作是设计、仿真了一种低变频损耗的V波段下变频器。
This thesis presents the design and manufacture of a V-band frequency quadrupler.
本文完成的主要工作是设计、仿真了一种低变频损耗的V波段下变频器。
The mainly finished task of this paper is designing and simulating an V band downconverter with low conversion loss , which realized by use of passive 4th harmonic mixing.
本文介绍了一种数字式下变频器的控制系统。
This paper introduces a numeral down converter control system.
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