由混频器，本振，中频组成。
文中着重讨论了本振频率冷跟踪误差问题。
There are two kinds of errors, cold tracking error and post-hot-tracking error.
二次变频的本振信号由PLL的输出信号经整数分频得到。
The second local frequency signal is provided by an integer-divider after PLL output.
这种商用集成芯片可用于本振合成回路，高精度时钟发生器等。
This commercial integrated chip can be used in the local oscillation circuit, high-accuracy clock generator and so on.
这种商用集成芯片可用于本振合成回路，高精度时钟发生器等。
The function generator MAX038 has complete machines function, the integrated chip synthesize of undee produce and transfer circuit.
本振和射频的输入通过波导-微带探针过渡将能量传给功率混合电路。
RF and LO signals are transmitted to the circuit by Waveguide-to-Microstrip Probe Transitions.
本文讨论了采用锁相环路作为本振信号的混频器对本振锁相环路的影响。
This paper discusses the influence of mixer on the phase lock-loop (PLL) circuit of a local oscillator. In mixer, local signal is produced by the PLL circuit.
尤其关键的是第一个本振的相位噪声，我们需要调谐我们接收机的合成器。
Particularly critical is the phase noise of the 1st LO, the synthesizer, which we need to tune our receiver.
在现代雷达和通讯系统中，本振相位噪声越来越成为决定系统性能的关键因素。
In modern radar and communication system, phase noise of local oscillator (lo) becomes a vital factor of system performance.
为获得更低的相位噪声，在对影响本振相噪关键因素分析的基础上进行电路的设计。
To gain lower phase noise of local oscillator, the design work of circuit is carried out based on the analyse of the key factors that affect the phase noise level.
应用该方法可使其在所用频率点上无相位截断噪声，从而使调谐器本振的相位噪声大大改善。
According to this method all the DDS output frequencies have no phase truncation noise, so the phase noise of the tuner local oscillator is greatly (improved.)
介绍了采用置频等待、数字本振及微处理机技术实现非相参捷变频自适应雷达频率控制的方法。
This paper introduces a method to realize frequency control of a noncoherent frequency-agility adaptive radar by using frequency setting and waiting, digital local oscillator and micro-processor.
激光相干阵列成象雷达系统中本振光波前与信号光波前匹配与否直接影响系统的灵敏度和分辨力。
The matching of the local light wavefront and signal light wavefront in the laser coherent array imaging radar system will directly affect the sensitivity and resolution of the system.
采用双平衡混频结构进行设计，在射频端口实现宽带阻抗匹配，在本振端口选取合适的开关信号。
With the use of double balance mixer structure, we achieved wideband impedance match at RF port and selected appropriate switch signal at LO port.
频率合成器是作为接收机中的重要模块，它的性能指标直接决定了本振信号(LO)的精度和纯度。
Synthesizer is an important block in the receiver whose performance is directly related to the accuracy and purity of the local oscillator signals (lo).
提出了降低本振附加的fm噪声，减小系统的鉴频效应，使整机的附加噪声得以有效抑制的改进措施。
The methods to minimize the extra FM noise of LO and the discrimination effect are proposed so that the additional receiver noise can be effectively repressed.
并以DDS为核心设计了接收机的细扫本振，该本振具有变频速度快、分辨率高、相噪指标高等特点。
Design a synthesizer based on DDS, whose characteristics are fast frequency change speed, high resolution and low phase noise et al.
本文从旋转变频磁控管式频率捷变雷达的本振频率跟踪原理出发，分析了产生本振频率跟踪误差的主要因素。
The' main factors resulting in local frequency tracking error are analyzed based on the principles of the tracking local oscillator for frequency agile radars of rotary tuning magnetron type.
在接收模式下，则利用DDS技术产生接收信号下变频所必需的本振信号，然后采用DBF技术形成接收波束。
In receiving mode, through controlling DDS, it produces the local oscillation signal needed by down frequency conversion of the receiving signal. Then the DBF is used to form the receiving beam.
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。
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.
在介绍瞬时中频测试技术的基础上，介绍利用瞬时中频测试技术对捷变频雷达本振跟踪精度进行测试的原理和方法。
Bases on the IIFM technique, the principle and method to measure the local oscillator tracking accuracy of frequency - agile radar is put forward in this paper.
分析了前端部件中本振源相位噪声和混频器本振射频端口隔离度对系统探测性能的影响，指出在距离较近时影响明显。
The LO phase noise, LO-RF port isolation of the mixer in the front-end and their effect on the detectability of the radiometer were analyzed in this paper.
作者的主要工作就是设计数字电视发射机中的本振频率源，这是上海明珠公司数字电视发射机开发项目的一个重要部分。
The author's main work is the development of the lo (local oscillator) in DTV transmitter, it is one of the important research projects planned by Shanghai Mingzhu Company.
通过采样和计算机处理，完成了LFMCW本振信号和目标回波模拟信号的差拍信号的测试与分析，得到了满意的结果。
Measured and analyzed the beat signal of LFMCW and simulated echo of object signals by sampling, computer processing, achieved satisfying result.
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。
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.
偶次分谐波混频可有效地抑制载波泄漏、二次混频失真及本振噪声，是提高调制器精确度及直接解调器动态范围的有效技术。
In this paper, we discuss even subharmonic mixing technique which can suppress carrier leakage in microwave direct modulator, or suppress IM2…
同时也提出了热跟踪后本振频率跟踪误差项。分析前者，可以决定热跟踪电路应予修正的频率范围，而后者则是跟踪本振最终的误差。
The former determines the frequency range which should be revised by the hot tracking circuit, while the later is the final frequency error of the local oscillator.
毫米波混频器是许多毫米波系统的关键部件之一，而研制低相噪毫米波本振源比较困难且成本较高，毫米波谐波混频器正是解决这一难题的有效途径。
Millimeter Wave (MMW) mixer is one of the most key equipment of many MMW systems, however it is difficult and high costed to research on MMW local oscillator with low phase noise.
毫米波混频器是许多毫米波系统的关键部件之一，而研制低相噪毫米波本振源比较困难且成本较高，毫米波谐波混频器正是解决这一难题的有效途径。
Millimeter Wave (MMW) mixer is one of the most key equipment of many MMW systems, however it is difficult and high costed to research on MMW local oscillator with low phase noise.
应用推荐