Third , an active mixer which needs only single - end local oscillator ( lo ) input is presented , which simplifies the rf block design and reduces the impacts of the phase noise of lo 接着本文提出了一个新型的、只需要单端本振输入的有源混频器,简化了整体电路设计,并降低了本振相噪带来的影响。
The phase detecting error caused by local oscillator frequency drift and non - synchronization of measurement signal and gate signal is eliminated and the measurement speed is improved at the same time 该方法可以有效的消除因本振信号频率漂移及闸门信号与被测信号的非同步引起的测相误差,同时提高了测量速度。
From chapter three to chapter five , the three key components of the system : millimeter - wave phase locked sources , multiple frequency local source , low noise amplifier are designed and tested 第三章至第五章分别介绍了毫米波锁相源、二倍频本振源和低噪声放大器三个系统关键的单元电路的设计过程和测试结果。
The optimized design and performance of the circuit of sampling phase - locked frequency synthesizer in microwave high - stability frequency - synthesizing technology are researched for the high demand of microwave frequency source 针对卫星电视接收机中微波高稳定本振源的要求，重点研究了取样锁相频率合成器电路的优化设计及性能。
The effect of local oscillator syntonization error and triggering time synchronization error on bistatic sar imagery are analyzed based on their error models . useful simulation results are provided for system design 本文重点研究了双基地sar本振相位同步误差与触发时间同步误差对成像的影响,建立了误差模型,给出了仿真试验结果,为系统设计提供了参考依据。
In the microwave and milli - wave system , the performance of the up - mixers play a key role in the whole system . this dissetation make a research in the theoretics and design of the milli - wave up - mixers and the lo multipliers 在微波、毫米波系统中,性能优越的上变频组件对系统性能起着关键性的作用。本文对毫米波上变频器及其本振倍频链的理论和设计进行了研究。
The phase noise in microwave receiver and the measured parameter of source frequency instability are described in this paper , and the technology of frequency - synthesizing and theory of phase locked loop ( pll ) are also briefly introduced 摘要阐述了微波接收机中的相位噪声概念及本振源频率不稳定度的实际测量参数，并简要介绍了频率合成技术和锁相环路工作原理。
In the passive circuit part , according to the theories of microstrip line and coupled microstripwe , the characteristic of microstrip and coupled microstrip was analyzed , the x band filter and dc block circuit of amplifier have been designed by hp - ads software 为毫米波设备提供本振源。在无源电路部分，我们首先对微带线、耦合线等基本理论作了简单的介绍。
The experimental result expresses that the frequency doubler - power amplifier sets of ka - band can supply good local oscillation source for " millimeter - wave front - end of " lmds " " . the model has the advantages of low cost , small size and high reliability 实验结果表明，倍频放大组件能够为lmds毫米波前端提供很好的本振源，并且具有成本低、体积小、可靠性高等优点。
This problem could be resolved by using sub - harmonic mixer ( shm ) . instead of using mmw lo , shm using microwave signal with frequency equals 1 / 2 or 1 / 4 of mmw lo frequency , thus the technical difficulty and cost of mmw system is reduced remarkably 采用亚谐波混频器( sub - harmonicmixer )可将本振频率降为基波频率的1 / 2或1 / 4 ,从而克服了直接采用毫米波本振源带来的困难,降低了射频接收机的技术难度和系统成本。
