放大

Many domestic and foreign companies and universities are making research on the architecture and system of RF power amplifier.

本文所讨论的射频预失真放大系统的设计正是为更好的实现射频大功率放大器的线性化而进行研制和开发，特别是针对WCDMA基站中的应用。

The AC power supply unit provides AC voltage for the signal generating unit and the high voltage amplifying unit.

直流电源单元为信号发生单元和高压放大单元提供直流电压。

Because of the self-control module, the linearization power amplifier system can work steadily in defiance of the changing of temperature, time, input power etc. It makes the system more practicably and expends the use of linearization system.

由于加入自适应控制模块，射频电路不受温度、时漂、输入功率等的影响，可始终处于较佳工作状态，这使得整个放大系统更为实用，也更具有拓展价值。

A charge integrator is adopted as pre-amplifier, which is insensitive to parasitic capacitance and has a very low noise level.

该电路采用电荷积分器作为前级预放大装置，对寄生电容不敏感，而且具有非常低的噪声。

It uses no pre-amplifier stages, instead feeding the incoming signal directly on the power amplifiers.

它不使用预放大级，而喂养的功率放大器直接输入信号。

If you only have an old turntable and no amplifier, you will need to amplify the signal using a pre-amplifier before plugging it into the PC sound card.

如果你只有一个老唱盘，没有放大器，你需要使用前置放大器将信号放大，然后再将其与电脑声卡连接。

In order to read out hot response signal of the detector, we should use the pre-amplifier to prevent the conversion or enlarge signals and pretreat, which satisfies the flowing signal processing.

为了有效读出探测器的热响应信号，需要利用前置放大器进行阻抗变换或者信号放大以及预处理，以便满足后续信号处理的要求。

Mainly by the alarm detection circuit, pre-amplifier circuit, A/D conversion, microprocessor control circuits, alarm circuits, etc., to achieve the concentration of the gas collection and alarm control.

该报警器主要由检测电路、前置放大电路、A／D转换、微机控制电路、报警电路等组成，能够实现对矿井瓦斯浓度的采集和报警控制。

In this paper, common preamplifiers were introduced. To obtain the biggest output signal of the noise ration, we choose the low noise tube as the pre-amplifier according to best source resistance match principle.

本文以热释电探测器的前置放大电路为例，主要根据最佳源电阻匹配的原则选择低噪声晶体管，作为前置放大器，以得到最大的输出信噪比。

The results show that the rolling type lead shear damper realizes the preconcerted aim of better energy dissipation capability on the condition of small displacement.

在充分分析已有阻尼器相关技术性能及适用范围的基础上，发明了耗能效率高、性能稳定、耐久性好、占用空间小、有放大位移及转角功能的新型转动式铅剪切阻尼器。

Shop assistant: Please check at the door.

店员：请您到门口柜台交费。

In the end, transportation of PAHs in the environmental matrix was preliminarily investigated and discussed according to PAHs data of soils and sediments from a certain region in Shanghai. The result indicated that there are two or more pathways on PAHs transportation in the environmental matrix.

最后，对上海特定地区内PAHs在环境介质中的迁移径途进行了分析讨论，结果表明上海市土壤和沉积物等环境介质中PAHs的迁移存在多种途径。