介绍利用复杂可编程逻辑器件CPLD和直接数字合成专用电路dds，设计雷达信号回波模拟器的硬件系统。
Introduce how to design hardware system structure of radar signal echo simulator by using CPLD and DDS.
在此基础上，介绍了小数分频器在直接数字频率合成技术和步进电机驱动速度控制中的两种常见应用。
Applications of decimal Fraction frequency divider in the area such as direct digital frequency synthesis technology and stepper motor drive speed controller a re introduced.
该芯片采用了改进的直接数字频率合成算法、流水线结构与ROM分时复用技术，保证了芯片的高性能和速度，节省了芯片面积。
A modified direct digital frequency synthesis (DDS), pipelined structure, and time-sharing ROM are adopted in the chip, for saving chip area and ensuring high performance and speed.
直接数字式频率合成(DDS)技术是一种全数字频率合成技术，其特殊的原理和结构使它具有多种调制能力。
Direct digital synthesis (DDS) is an all digital frequency synthesis technique. Because of its special theory and construction, it has many kinds of modulation capability.
介绍了锁相环(PLL)技术和直接数字式频率合成(DDS)技术的基本工作原理，给出了一种提高DDS输出频率精度及减小其相位截断误差的方法。
This paper introduces the theory of the phase-locked loop (PLL) and the direct digital synthesis (DDS), a method to improve the precision of DDS and reduce its phase truncation error is also given.
采用DDWS(直接数字合成)方法，产生了MFSK (m元频移键控)和OFDM(正交频分复用)两种水声通信信号。
And the method of DDWS (direct digital wave synthesis) is adopted to realize the signals of MFSK (multi-frequency shift keying) and OFDM (orthogonal frequency division multiplexing).
在利用直接数字式合成方法产生周期信号时，信号的频率分辨率和带宽直接受限于合成系统的工作频率和存储容量。
In the direct digital synthesis of periodic signals, the frequency resolutions and bands of the synthesized signals are limited by the working frequency and data capacity of the synthesizing system.
该系统采用了直接数字频率合成技术(DDS)和并发处理技术，提高了系统的性能和处理速度，较大程度地减少了硬件延时。
The system USES direct digital synthesize (DDS) and parallel processing technique, improves the performance and speed of the processing, and reduces the hardware delay mostly.
直接数字合成是先进的频率合成技术，给出了直接数字合成器的设计方法和实现技术。
Direct digital synthesis is a kind of advanced technique on frequency synthesis, in this paper, the design and realized technique of DDS is given.
此方法利用直接数字合成技术完成对方波的频率和振幅的调整。
Direct digital synthesis is used for modulating the frequency and amplitude of the square wave.
文中分析了雷达与外部电磁环境之间的双向兼容性问题，并对所采取的窄带接收机、数字直接合成（DDS）频率源和副瓣对消技术作了介绍。
We analyze bi-directional compatibility between radar and outside electromagnetism circumstance and also bring a detailed introduction to narrowband receiver, DDS(Digital Direct Syn…
介绍了直接数字频率合成技术以及分析其杂散误差，对相位截断误差和幅度量化误差进行了傅立叶级数分析研究。
The spectrum characteristics of the phase truncation error and amplitude quantization error are analyzed by the method of Fourier series.
本文首先介绍了直接数字频率合成技术的原理和结构，并分析了其噪声来源和抑制方法。
Firstly, this paper introduced the principle and structure of direct digital frequency synthesis and analyzed the source and suppression methods of frequency noise.
广泛采用的直接数字式频率合成方法，却面临输出频率上限难以提高和输出杂散的难以抑制两个难题。
Therefore, the frequency synthesizer works in millimeter wave band is mostly designed and realized by the way of indirect phase lock frequency synthesis, based on specific integrated circuit.
首先对直接数字频率合成技术(DDS)和锁相频率合成技术(PLL)的基本原理、特点及相噪特性作了详细的分析。
Firstly the basic theory of DDS and PLL, as well as their characteristics and phase noise properties have been analyzed detailedly.
首先对直接数字频率合成技术(DDS)和锁相频率合成技术(PLL)的基本原理、特点及相噪特性作了详细的分析。
Firstly the basic theory of DDS and PLL, as well as their characteristics and phase noise properties have been analyzed detailedly.
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