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Which has increased 30%~40% compared with that using the scheme of one doubler and one mixer.

比采用单倍频单混频方案时增大了30%~40%。

A method to determine the small-signal equivalent circuit of FET's is proposed.

最后讨论了功率放大器、倍频器、混频器等的优化设计的目标函数及梯度的计算,论述了优化方法及提高软件可靠性的方法,给出了功率放大器优化设计算例。

The paper describes a new method for decreasing the fixed error in a conventional FM-CW radar.

本文介绍一种减少常规FM-CW雷达固定误差的新方法——双频混频调制法。

The mixers with Cherry Hooper technique provides the demand of wide bandwidth in WLAN's application.

使用Cherry Hooper技术混频器改善了无线通讯中宽频的需求。

To resist multipath and ISI in acoustical communication, a single filter receiving method and a new method, namely preprocessing frequency hopping filtering method, were adopted simultaneously. A controlled preprocessing frequency hopping filter was added before mixing frequencies of signal receiving system to strengthen resistance against multipath and ISI. The method was simulated respectively on two frequency hopping sequences of PN code and increasing sequence.

除了采用以往的单一滤波接收处理方法,本文还采用了一种新的接收处理方法,即前置跳频滤波接收处理方法,与其他方法不同的是在信号接收系统的混频之前增加了可控的前置跳频滤波器,可以增强抗多途和码间串扰能力,并对此方法分别采用PN码和递增序列2种跳频序列进行仿真研究。

Especially , with the wide use of the low noise microwave receiver model of "low noise amplifier - mixer - intermediate frequency amplifier", the rejection to image frequency interference has become the last problem how to make the whole receivers noise low and resist interference.

尤其是随着"低噪声放大器——混频器——中频放大器"这种低噪声微波接收机模型的广泛使用,对镜频干扰的抑制已逐渐成为整机低噪声、抗干扰的最后难题。

A new way of distance measurement is introduced in this paper, it is similar to traditional measurement way, and has its origination. In the new measurement way, the rough measurement of the distance is realized by countering high frequency pulses filled in discriminable phase pulses. Discriminable phase pulses go through integral circuits, and then are sampled by Analogue Digital Converter, so the accurate measurement of the system is obtained by the sampling value.

本文提出了一种新的测距方法,该方法与常规相位测距仪比较,既有相似之处也有其创新之处,常规相位测距仪一般使用多波长测尺频率组合、差频数字测相的方法,本系统虽然也采用多波长测尺频率组合,但并不采用差频数字测相,该方法摒弃了传统的内外光路的切换方式及电路的混频,粗测采用对鉴相脉冲填充高频脉冲的办法实现,精测则利用鉴相脉冲对积分电路进行积分,然后由ADC 对积分电平进行转换,通过对ADC 的输出值的计算处理实现精测。

A wideband Gilbert micromixer with an LO rat-race coupler is demonstrated and works from 2.5 to 13 GHz.

此外,展示了应用此型态鼠径耦合器之2.5到13 GHz宽频微混频器。

Since the superheterodyne receiver was invented, mixer has long been the research focus in communication and radio frequency circuit fields, which is the key component to realize the frequency translation.

自从超外差接收机的结构被提出以后,混频器作为其中实现频率搬移的关键部件一直都是通信和射频电路研究的热点。

A kind of tunable frequency-selective converter based on nondegenerate four-wave mixing in semiconductor laser amplifier is proposed in this paper.

庞叔鸣 ,崔一平,蒋雁提出了一种可调谐选频变频器,利用半导体光放大器中的非简并四波混频过程实现波长转换。

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The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应,而且减少跟风的可能性。

The new PS20 solar power tower collected sunlight through mirrors known as "heliostats" to produce steam that is converted into electricity by a turbine in Sanlucar la Mayor, Spain, Wednesday.

聚光:照片上是建在西班牙桑路卡拉马尤城的一座新型PS20塔式太阳能电站。被称为&日光反射装置&的镜子将太阳光反射到主塔,然后用聚集的热量产生蒸汽进而通过涡轮机转化为电力