The performance of the differential mode loop , the characteristic of mrc combining and the high - pass characteristic of the error transfer function of the uniform sampling second - order dpll are simulated in the matlab , the simulation results are given 在matlab环境下对分集合并中的差模环特性、最大比合并特性以及均匀采样二阶数字锁相环误差函数高通特性进行了仿真,给出了仿真结果。
We design the digital phase - locked loop applying the method designing digital circuitry from the top down . we design the circuitry by the vhdl in the maxpulsii software environment . we validate the circuitry function in the emulator 采用自顶向下的数字电路设计方法设计全数字锁相环路，在maxplusii设计环境下采用vhdl语言、 ahdl语言等设计实现数字锁相环，并通过计算机仿真证实其正确性。
The principal of the digital communication theory and the relational theory of the synchronization are introduced in fourth chapter . in fifth chapter , author detailedly describes the methods of two kind digital phase - locked loop , expounds the processing of design and implementation by fpga 第四章介绍了数字通信中位同步的相关理论,并在第五章详细叙述了两种数字锁相位同步的原理,并论述了使用fpga设计实现这两种位同步方法的过程。
And then the stability and the stable error response of the dpll are analyzed . there is an obvious doppler shift frequency offset in the received signal with flight at a high speed , in the dissertation the uniform sampling second - order dpll is used to remove the frequency bias for its excellent high - pass characteristic of the error transfer function 由于高速飞行的遥测目标在接收信号中会出现较大的多普勒频率分量,而典型均匀采样二阶数字锁相环dpll ( digitalphase - lockedloop )的误差函数具有高通特性,所以本文提出一种利用其高通特性来去除多普勒频率分量的新方法。
Through using for reference and demonstrating the technology of video processing system of domestic and foreign , author has put forward a set of video processing system schemes suitable for the china " s actual conditions . by using the digital technology , such as digital encode - decode , digital phase - locked , digital filter , digital image storing , the system schemes realizes tv signal noise reduction and time error elimination in real time , and makes the system be a integrated noise reduction and time based corrector really 通过借鉴和论证国内外时基校正和视频降噪的相关技术，作者提出了一套适合于中国国情的视频处理系统软、硬件方案实现模拟电视的信号数字转换以及利用数字编解码、数字锁相、数字滤波、数字图像存储等数字技术来实现电视信号实时去噪和消除时基误差，使系统真正做到集时基校正与降噪一体化。
Frequency source is widely used in today ' s electronic equipment and even refered as " a heart " of many electronic systems . the frequency synthesizer with a lot of channels and high frequency stability by means of theory of phase locking has almost been a necessary component in the modern electronic systems such as telecommunication , radar and electronic countermeasure . the phase - locked frequency synthesizer can be generally divided into two kinds : one is digital phase locked frequency synthesizer , the other is analog sampling phase locked frequency synthesizer . compared with the prior , the latter has many merits such as lower phase noise , samller volume , lighter weight and lower power consumption and has a wide foreground in the equipments of microwave band 利用锁相原理来获得波道数目众多、频率稳定度很高的频率合成器，几乎已成为现代通信、雷达和电子对抗等电子系统不可缺少的组成部分。锁相式频率合成器一般分为数字锁相频率合成器和模拟取样锁相频率合成器两类。取样锁相频率合成器与数字锁相频率合成器相比，具有相位噪声低、体积小、重量轻和功耗低等优点，尤其在微波波段的电子设备中，具有广阔的应用前景。
An idea is brought forth to design the total structure of the usb interface ip , the main control logic , the mcu interface ( the function is the same as the pdiusbd12 chip of the philips semiconductor ) and a dpll which is used to synchronize data and separate the clock . this paper also introduces packet recognition , transaction sequencing , sop , eop , reset , resume signal detection / generation , nrzi data encoding / decoding and bit - stuffing , crc generation and checking ( token and data ) , packet id ( pid ) generation and checking / decoding , 提出设计了usb接口电路的整体构架，设计了usb的主要控制逻辑和与mcu的互连的接口（此接口与飞利普的usb接口芯片pdiusbd12兼容） ，也设计了一个数字锁相环（ dpll ）来同步数据和分离时钟，并对同步模式的识别、并行/串行转换、位填充/解除填充、 crc校验/产生、 pid校验/产生、地址识别和握手评估/产生做了具体的分析。
According to the principle of correlation detection , an automatic measurement system for extinction ratio of polarizer consisted of monochromator and dsp lock - in amplifier and compurer is designed not only to eliminate the influence on measurement accuracy caused by drift of intensity of light source but also to obatain approximate extinction spectrum 摘要基于相干检测原理设计了一套由单色仪、数字锁相放大器和计算机联合使用的透射式偏光镜消光比智能化测试实验系统，采用双频双光路分光单探测器接收锁相放大器分离信号比对法进行源补偿测量，克服了光源光强漂移所带来的影响；实现了可见光区消光比的精确自动测量，而且可以测得近似的消光光谱。
On the basis of our lab ' s previous achievements , the author has studied three kinds of digital signal processing methods - the method based on a digital phase locked loop , the method based on quadrature demodulation , and the method based on adaptive funnel filter ( aff ) and sliding goertzel algo rithm ( sga ) . the author has also studied the cmf driving principle , various analog driving circuits , driving waves , and digital driving methods 主要研究了三种科氏流量计的数字信号处理方法：基于数字锁相环的方法、基于正交解调的方法和基于自适应funnel滤波器和滑动goertzel算法的方法；以及科氏流量计驱动的原理、各种模拟驱动的波形、电路以及数字驱动的方法等。
We design inversion control circuit with cmos figure pll cd4046 act as core and microprocessor 80c196kc act as assistant controller . adopting a control method that combine fuzzy controller and pll control , improve induction heating power succeed in startup . adopting electric current voltage pair closed loop feedback design , with trough route capacitance voltage and trough route electric current act as pair closed loop feedback signal , guarantee induction heating power output accuracy 并对系统主电路的元器件参数进行了详细的计算；设计了以cmos数字锁相环cd4046为核心、以80c196kc作为辅助控制器的逆变控制电路；采用了模糊逻辑与锁相环相结合的控制技术，提高了电源的启动成功率；采用电流、电压双闭环反馈方案，采用槽路电容电压和槽路电流作为反馈信号，从而保证了电源功率的输出精度。
