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频放大器
相关语句
  selective amplifier
     The second and third harmonic signal of E-t or (dE)/(dt)-t curves can beeasily obtained by using a frequency selective amplifier which is consisted of twin-T filter network.
     E-t、dE/Dt-t曲线的二次或三次谐波信号可以利用由双T滤波器构成的选频放大器获得。
短句来源
     It consists of six parts: the track transformer, 25Hz band pass filter, potential gate flip-flop, frequency selective amplifier, executing circuit and the rectified power source.
     它由轨道变压器,25Hz带通滤波器,门限触发器,选频放大器,执行电路和整流电源6部分组成。
短句来源
     The design principle of the current tranducer and the selective amplifier of ajustable central frequency has been discussed, the paper also introduces the circuit constitution and technique parameters.
     讨论了电流传感器和中心频率可调的选频放大器的设计原理 ,并介绍了电路组成及技术参数。
短句来源
     The segment of automatic ellipsometer in document-the measurement of polarization nulling has been improved. Using Terbium special glass (Verdet constant=0.31 min/Oe·cm) as modulator material,a new type of magneto optical modulator and driver circuit have been designed and constructed. Polarized Light is modulated by DC and AC,using ultra low noise frequency selective amplifier and lock in amplifier,the repeatability error S 3 of nulling is not greater then 0.000 4°.
     对文献 [1]的自动椭偏仪的部件偏振消光测量系统作了改进 ,用 Verdet常数为 0 .31min/ Oe· cm的铽玻璃作磁光调制材料 ,设计了新型磁光调制器和驱动电路 ,对偏振光进行直流加交流调制 ,结合使用超低噪声选频放大器和锁定放大器 ,消光角测量的重复性标准差 S3不大于 0 .0 0 0 4°
短句来源
     High-quality measurement of microwave antenna pattern is a difficult problem with measuring amplifier or selective amplifier. By means of lock in amplifier,the precise measuring system of microwave antenna pattern has been devised in this paper. Contrast to the conventional measure method on intercommunity characteristics of signal and noise,the paper gives a new method which uses periodic of signal and random of noise to restrain noise and take out signal.
     采用常规的测量放大器或选频放大器进行微波天线方向图的高精度测量是困难的,本文设计了利用锁定放大器精确测量微波天线方向图的电路,该方法是从信号和噪声本身的特性出发,针对信号的周期性和噪声的随机性的特点来抑制噪声,提取信号。
短句来源
  “频放大器”译为未确定词的双语例句
     6.65 W Output of LD-Pumped Double-Clad Fiber Single-Frequency Amplifier
     6.65 W输出二极管抽运双包层光纤单频放大器
短句来源
     PSPICE emulational analysis of a frequency discrimination expandor
     鉴频放大器的PSPICE仿真分析
短句来源
     According to the EER theory, using the amplified envelope signal as the power supply of the Class-D amplifier, the envelope will modulate the magnitude of the RF signal.
     将放大的包络信号作为Class-D载频放大器的电源,根据EER原理,Class-D载频放大器输出载频信号的幅度将受到包络信号的线性调制,达到同时实现对载频信号的放大和AM调制的目的。
短句来源
     The Class-D voltage switching amplifier technology is adopted to develop the RF amplifier.
     载频放大器采用高效率的Class-D开关放大技术。
短句来源
     Experimental results show that both temperature limited sensitivity and relative temperature measurement sensitivity of V(T)~T curve are suitable for the requirement in the range of practical measured temperature.
     实验结果表明,采用所选择的激光波长和光学系统的相对孔径及选频放大器的带宽,在实际的测温范围内,系统的温度分辨力和V(T)~T曲线的温度灵敏度均能够满足系统要求。
短句来源
更多       
  相似匹配句对
     CATV Adjacent Distribution Amplifier
     有线电视邻分配放大器
短句来源
     The Theoretical Analysis of Second Harmonic Amplifier
     倍放大器的理论分析
短句来源
     Brain Mave Amplifier
     脑波放大器
短句来源
     ON THE LOW-PASS DISTRIBUTED AMPLIFIER
     分布式放大器
短句来源
     Complex-frequency Vibrating Screen
     复振动筛
短句来源
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  selective amplifier
A selective amplifier working by feed-back mechanism and permitting a recording of low insect voices in a noisy environment is described.
      
Due to a selective amplifier system only that part of luminescence is processed which is induced by the individual excitation pulses.
      
The 1 MHz carrier is extracted from the sequence of data by means of a selective amplifier analogue filter and a comparator for squaring the signal.
      
The measured quantities were detected on the selective amplifier on the end of the line.
      
The selective amplifier is composed of two stages, a rail-torail low-noise preamplifier and a bandpass filter.
      


Summary Temperature changes have great effect on the performance of transistor ampli- tiers.Intensive studies have been made on the stabilization of these amplifiers against temperature changes and quite a number of articles on this subject can be found in the literature.But most of them have centered their main object on the stabilization of d.c.operating point rather than on the stabilization of output voltage which should be the final aim for which we are to strive in any amplifier.In this article question...

Summary Temperature changes have great effect on the performance of transistor ampli- tiers.Intensive studies have been made on the stabilization of these amplifiers against temperature changes and quite a number of articles on this subject can be found in the literature.But most of them have centered their main object on the stabilization of d.c.operating point rather than on the stabilization of output voltage which should be the final aim for which we are to strive in any amplifier.In this article question of stabilization against temperature changes is discussed in general,nature of variations of transistor parameters is then explained,and finally are presented various methods of stabilization of output voltage of transistor audio amplifiers.The methods consist of compensation by means of displacement of d.c.operating points,both linear and nonlinear,compensation in terms of changes of h_(21) and h_(22) with temperature and negative feedback methods.Large amount of experimental work was done in connection with these methods.Curves illustrating the results obtained are herewith presented.

温度变化对于晶体管放大器的工作情况具有巨大影响。人们在这个问题上曾作深入研究。文献中关于这问题的文章已发表很多,但大多数的注意力均放在直流工作点的稳定而不在输出电压的稳定,在任何放大器输出电压的稳定应当是我们努力完成的最后目标,本文最先一般地讨论对温度的稳定性问题,随后说明了晶体管参量变化的性质,主要提出了若干稳定晶体管声频放大器输出电压的方法,其中包含直流工作点移动法(线性与非线性),h_(11)与h_(22)的温度补偿法,和负反馈方法。各种方法均做了大量实验,并附以实验的曲线。

This paper analyses the possibility of a Selective freguency amplifier how to aeguire a low noise level when it is connected for instance with a low resistance detector. when centric frequency is 13 Hz, band—width 0.8 Hz, an amplifier noise less than 2×10~(-10)v. eguivalent to input noise resistance of 2Ω Were obtained. It may be coupling with detector having resistance of 20 Ω.

本文对于与低阻接收元件联用的选频放大器如何获得低噪音作了較詳細的討論,並得到了较好的实验結果。当选頻頻率为13.2Hz,带寬为0.8Hz时,放大器噪音低于2×10~(-10)伏,等效噪音电阻2Ω,可与20Ω的接收元件匹配。

This a seleotive frequency amplifier used for measuring low light, level, with centric frequency 85Hz, band—width 2Hz,an amplifier noise is 2×17~(-7)V.In room temperature condition, with the amplifier, the light may be measured as low as 10~(-12) lumin.

本文描述了为测弱光用的选频放大器,当f_0=85Hz,Δf=2Hz时,噪音2×10~(-7)伏,在室温条件下用此放大器可以测到10~(-12)流明的弱光。“弱光测试”要求一台噪音低、放大倍数高、通频带窄、稳定性和线性好的选频放大器。本文简述装调“弱光测试用选频放大器”的过程中所碰到的主要问题的分析及其解决的方法和措施。弱光测试用选频放大器的性能指标:放大倍数为2.17×10~5、噪音电平为2.0×10~(-7)伏、通频带宽为2周/秒、中心频率为85.6周/秒。

 
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