混频

The dual-band differential LNA use Inductive source degeneration structure, a matching network is used for the LNA to develop dual-band. The micro-mixer use a matching network shunt and parallel LC elements to develop wide-band matching. The biasing method reduces the"voltage headroom" difficulties inherent to the Gilbert cell, and the mixer linearity can be improved using this biasing method "Charge -Injection"by accurate adjustment of the input MOSFET operating point. The complementary VCO based on 2.5GHz, and tuning output buffer to approach 2GHz/5GHz dual-band for dual-band down-converter with MMIC technology.

其中双频差动低杂讯放大器，本电路用Inductive Source Degeneration 架构，在匹配网上设计，使低杂讯放大器工作在个频带上达成双频带的效果；CMOS 微混频器上采用LC串联、并联电路做匹配，达到宽频匹配的效果，并加入了"Charge-Injection"的方法来改善"voltage headroom"的问题，并同时提高线性度的表现；互补式压控振荡器以2.5GHz为基频的振荡器为出发点，透过电路的调整，以期达成2.5/5GHz的双频带需求，能够完整达成双频带接收机系统。

In chapter 4, a study of GaAs FET doubler is presented, and experimental verification the doubler is work well in Ka-band.

首先对肖特基二极管做了简介，然后对已有的混频器电路做了比较，最后设计了Ka频段平衡混频器。

Comparing with FWM without dressing fields,the strength of the singly-dressing FWM signal is suppressed when the modulation-field is linear or elliptically polarized.

与非缀饰四波混频信号的强度相比，单缀饰光作用下的四波混频信号的强度在偏振调制光为线偏振及椭圆偏振的情况下受到了不同程度的抑制。

In GCT 2.0 μm InGaP/GaAs HBT, there are a 5.2GHz single-in single-out micromixer and a 5.2GHz single-in single-out micromixer with lumped element rat-race.

而采用GCT 2μm InGaP/GaAs HBT制程则包含了5.2GHz单端输出单端输入微混频器与5.2GHz整合集总元件Rat-race的单端输出单端输入微混频器电路。

This paper introduced the de- sign of a mixer,which had the functions of low voltage(3 V)supplied,low power loss mixer,low noise figure, high gain compression and well structured image rejecter,and it solved the problem of intermodulation distortion .

本文详细介绍了混频器的设计，该混频器实现了低电压3 V、低功耗、高1 dB压缩点、低噪声系数以及很强镜像抑制机制的功能，并解决了交调失真的问题。

The physics of the noise mechanism that is based on pair of active first detector understands, noise was used to eliminate a technique in circuit, twinkle in order to reduce what the switch in Gilbert first detector is in charge of noise, introduce an additional inductance and switch to be opposite in all the parasitism capacitance of source node is syntonic, the sonic system of a confusion of voices that improves whole circuit is counted and change gain to wait for crucial function index.

基于对有源混频器的噪声机制的物理理解，电路中采用了噪声消除技术，以减少Gilbert型混频器中开关管的闪烁噪声，并引入一个额外的电感和开关对共源节点的寄生电容谐振，改善整个电路的噪声系数和转换增益等关键性能指标。

Based on the polarization interference between two FWM processes, we demonstrate a phase-sensitive method for studying Raman-enhanced nondegenerate FWM .

基于两个四波混频过程之间的极化相干，我们演示了一种相敏探测方法用以研究喇曼增强非简并四波混频。

Through investigating the FWM power as function of channel power and channel space, it showed that the new phase-matching factor was more effective, the relationship of parametrical gain in FWM V.

分析了在色散位移光纤中四波混频的参量增益与泵浦光波长的关系，四波混频参量增益与泵浦光功率的关系。

Secondly, this work introduces the basic operating principle of mixer and several types of structures as well. Theoretical analysis of impact on performance (linearity, conversion gain, side band suppression etc.) posed by design parameters is given.

其次，介绍了混频器的工作原理及常见的电路结构，针对上混频器的电路特点，从理论上分析了电路中各部分对其性能指标（线性度、转换增益、边带抑制等）的影响，并通过图表较为直观的反映了性能指标和设计参数的关系。

It also introduces different configurations with different transmission line and the advantages of using them.

同时，给出了混频器的相关概念和指标，以及各种不同的混频电路及其指标的差异。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了