Based on an analysis of uhf ( ultra - high - frequency ) characteristic of pd ( partial discharge ) in power transformer , using mixing technique , a signal disposal cell has been devised for the sake of facilitating common data sampling card 摘要在分析了电力变压器局部放电的超高频特性的基础上，利用混频技术，设计了局部放电超高频信号的信号调理单元，方便普通数字采集卡采集。
The origin of supercontinuum ( sc ) generation in optical fibers has been conjectured to be the interplay between fiber nonlinearities ( self phase modulation , cross phase modulation and raman self scattering ) and group - velocity dispersion ( gvd ) 光纤中超连续supercontinuum ( sc )谱的产生源于光纤中各种非线性效应(自相位调制效应、交叉相位调制效应，四波混频效应及受激raman散射等)和群速度色散的共同作用。
By following the way of studying the nonlinear effect as a whole , the influence of the spm and xpm to the phase matching condition of fwm is studied . from the achieved analytical expression it can be seen that the phase modulation can change the efficiency of the fwm 根据综合研究非线性效应的考虑，本文研究了自相位调制及交叉相位调制对四波混频相位匹配的影响，在一定的简化下得到了解析的结果。
With the phase - noise model of the phase loked loop ( pll ) and the analysis of spur characteristic of fractional - n frequency synthesizer using - ? modulating technology , the scheme of pll with mixer + quadrupler is confirmed as a result 文中,通过建立锁相环路的相位噪声模型,并分析了使用- ?调制技术的分数频率综合器的杂散性能,以此二者为理论依据完成了毫米波频率源合成器的基本方案? ?锁相混频环+倍频器方案。
Measured result shows that the doppler radar signal we get in the self - oscillating mixer based doppler radar is about 400hz which matches well with the velocity of a moving object . the best conversion loss in fmcw system measures - 10db which is similar to the simulated result 通过对自振混频技术在多普勒雷达中应用的测试,得到多普勒回波信号的频率为400hz ,运动速度可以计算为6m / s ,与实际物体的运动速度相吻合。
By means of using the electronically tuned preselector and multiple conversion technology , a wide band receiver with wide dynamic range is basically achieved . the scheme is innovative and original not only in the scheme itself but also in the technology of some sub - circuits 课题采用电调选频和多次混频的方案基本实现了大动态宽频带接收，该方案无论是方案本身还是方案中所涉及到的技术都具有一定的创新与独到之处。
In former , image - reject mixer uses phasing to differentiate between two single - balance mixers . it ' s four diode is type of dmk - 2606 by made alphar corporation , module of mixer ' s integrated circuit is simulate by senerade 8 . 0 and ads software 然后介绍了混频器的基本原理，设计了镜像抑制混频器和上变频器放大电路，镜像抑制混频器是利用两个单平衡混频器的相位差对镜频进行抑制，其中四个混频二极管采用alphar公司dmk - 2606型。
The experiment show that cr : sbn crystal has super characteristic of four - wave mixing to produce the phase - conjugate wave . we study the dependence of the phase - conjugate reflectivity of 1000ppm cr : sbn crystal on the parameters of incidence light such as light intensity ratio and the angle of incidence 研究了掺杂量为500ppm的cr ： sbn晶体的四波混频相位共轭特性，发现该晶体的四波混频特性不如掺杂量为1000ppm的cr ： sbn晶体。
