查询词典 feedback amplifier

In audio, a very low frequency oscillation often resulting from a positive feedback path in an amplifier system .

在音响设备中出现的振荡频率极低的低频振荡，常因放大系统的正反馈回路引起。

This function is implemented by using positive feedback around an operational amplifier.

电路 的功能是通过 OP 的正反馈路径实现的。

It consists of an operational amplifier and resistor feedback networks.

该放大器由运算放大器和电阻反馈网路组成。

Broadband matching is very difficult, but we can make it easier with negative feedback and balanced amplifier.

宽带匹配网络的设计是一个难点，可以采用负反馈、平衡电路等形式降低宽带匹配的难度，所以宽带电路的设计首先是方案设计。

Students have to study how to efficiently use the tools for performance measurement on basic circuits through observation.(3) The un-ideal performance of circuits such as frequency response and noise.(4) Feedback, Operational amplifier and the stability in feedback system.

通过观察对基本电路性能的量化建立有效的分析工具(3)频率响应和噪声等电路的非理想性的介绍(4)反馈，运放和反馈系统中的稳定性。

Whether an input or output impedance is raised or lowered by feedback depends on the type of amplifier to which feedback is applied, as will be shown in the next section.

通过反馈后输入或输出阻抗是升还是降，取决于所提供的反馈的放大器的类型。在下一节中，我们将讨论这个问题。

Negative feedback circuit is the main body of SAW drive circuit which is composed by operation amplifier and feedback network, its function is to realize output impedance matching and electric circuit stable gain.

负反馈放大器是该驱动电路的主要部分，它由运算放大器加上电阻和电容构成的反馈网络组成，其功能是实现输出阻抗匹配以及保证驱动电路增益的稳定性。

A method to reduce the nonlinear error of a bridge using operational amplifier feedback were introduced,the feedback conditions of canceling nonlinearity were found by circuit analyzing.

采用放大器反馈控制法克服了传感器电桥的非线性误差，通过解析的方法找到了克服非线性误差的放大器反馈控制条件。

So we designed a adaptive synchronizing controller based on hereinbefore hardware environment: first a small magnitude reference signal r is outputted to system through the signal card (to ensure that the vibrating system works in a linear state), and this signal is sent to the moving coil of vibrator through the power amplifier, so vibration is produced through electromagnetic induction. Secondly the vibration signal can feedback to the data acquiring card in the servo system through the acceleration sensor on the Vibroseis reactor M〓 and the base-plate M〓, then the computer can get the current vibrating state y〓 of the coil of vibrator according to the feedback information from the data acquiring card, and give a real time comparing between the current state y〓 and the reference output y〓 of the set-in reference model with current reference input being r , then regulates the correlative controlling parameters according to the error e〓=y〓-y〓 till y〓→y〓, finally normal signal sweeping begins with a certain phase fixed. Meanwhile a synchronization signal for seismic signal record is sent to seismograph from synchronization signal outputting component in the Vibroseis system to perform the controlling process of synchronization of sweeping phases.

为此，我们基于以上的硬件环境设计了一个自适应同步控制器：首先通过信号发生卡对系统输出小幅度的参考信号r(从而保证振动系统工作处于线性状态)，信号通过前置放大器、功率放大器等送到激震器动圈，并通过电磁感应产生振动，振动信号通过可控震源激震器反应块M〓和基板M〓上的加速度传感器反馈给伺服系统中的数据采集卡，工控计算机根据采集卡的反馈信息，获取当前激震器动圈的振动状态y〓，并实时地将该状态与内置的参考模型在当前参考输入r下的参考输出y〓进行辨识，再将两者输出误差e〓＝y〓-y〓对系统的有关控制参数进行调整，直至y〓→y〓，最后在经过某一固定的相位后，开始信号的正常扫描过程，与此同时，由可控震源系统的同步信号输出部件向地震仪送出一地震信号记录同步信号，进而完成扫描相位同步控制过程。

There are proponents and opponents of negative feedback, regardless of its shortcomings, and Densen has chosen the design route of using no global feedback which is very difficult to do in a solid state push-pull amplifier.

有支持者和反对者的负反馈，不论其缺陷，电线选择了不使用全局反馈，这是很难在推动固态做推挽放大器的设计路线。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐