an oscillator whose output heterodynes with the incoming radio signal to produce sum and difference tones

in orthogonal frequency division multiplexing ( ofdm ) systems. the local oscillator phase noise introduces two effects ; common phase error ( cpe) and inter-carrier interference (ici).

ofdm系统中，本振相位噪声引入两种影响：共同相位误差（cpe）和载波间干扰（ici）。

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。

in receive mode the pll synthesiser generates the local oscillator signal.

在接收模式下，锁相环合成器产生的本地振蕩器信号。

frequency synthesizer (fs) is a very important block, which is used in a wireless transceiver as a local oscillator for frequency translation and channel selection.

频率合成器是射频收发机中非常重要的模块，是用于频率转换和频道选择的本地振蕩源。

we also analyze the effect of the deviation of local oscillator beam from tem10 mode on the displacement measurement result.

文中还用模式重叠的概念分析了本底光偏离标準的tem10模对测量结果的影响。

the source can meet to the demands of local oscillator in radio frequency subsystem of modern mobile communication gsm and cdma network.

实验测试获得了较好的技术指标，能满足现代移动通信c网和g网射频子系统对本振源的要求。

single frequency source is usually used as local oscillator in communication system and radar system, also as a reference clock in digital circuits, so it is a extensive-applied technique.

固定频率源可以在在通讯系统和雷达系统中作为本机振蕩器，也可以作为数字电路的基準时钟信号，因此得到了广泛的应用。

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.

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蹤精度进行测试的原理和方法。

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. )

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。

still further, a controller may be coupled to receive a control signalcorresponding to a variable impedance level, and control a local oscillator coupled to the mixer responsive to the control signal.

更进一步，控制器可以被耦合以接收对应于可变阻抗位準的控制信号，并响应于所述控制信 号来控制耦合到混频器的本机振蕩器。

confirm the scheme of mixed charge pump phase-locked loops. 4, analyze the theory of quadrature modulator, methods of restraining local oscillator leakage and side-band leakage.

确定了使用混合式电荷泵锁相环方案，并完成锁相环电路的设计和调试。

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.

本文从旋转变频磁控管式频率捷变雷达的本振频率跟蹤原理出发，分析了产生本振频率跟蹤误差的主要因素。

the local oscillator signal is mixed with the information-carrying signal to change its frequency up or down.

本机振蕩器信号和信息传输信号混频，使其频率上调或下调。