环路增益

This circuit gives a closed-loop gain equal to the ratio of the sum of R1 and R2 to R1 and a closed-loop 3 dB bandwidth equal to the amplifier unity-gain frequency divided by the closed-loop gain.

和反相电路相比，其最大的不同点在于，其输出信号和输入信号是同相的，其输入阻抗也是相当高的，为 OP 差模输入阻抗与环路增益的乘积(环路增益为：开环增益/闭环增益)。

The mutual inductance of the equivalent circuit, coupling coefficient, quality factor of the DR and microstrip coupling model have been discussed.

本文分析了振荡器的基本原理，介绍了振荡器的两种基本模型；给出了应用广泛的环路增益公式的推导过程，并提出了新的环路增益公式；讨论了振荡器相位噪声的线性化模型；介绍了锁相环的基本原理，分析了锁相环各部分电路相位噪声的传递函数。

It proposes the control-output transfer function of the nondeal Buck converter using circuit average method, the model in Pspice 10.0, the open-loop and gain of the voltage control loop simulations of the system. A prototype of output power 15W has been made up, and the experimental results are agreed with the simulative results.

用电路平均建模法推导出非理想Buck变换器控制-输出的传递函数，在PSpice10.0环境下建立了仿真模型，对系统进行了开环和电压控制环路增益仿真，并在研制的15W实验样机上进行了系统的实验测试。

By the method, the phase shift of signal was realized with programma. Together with variable gain larger and ilter processing, it made a positive feedback loop to compensate the variation energy loss of micro cantilever.

利用FPGA的可编程数字信号处理功能实现信号的移相，并与可变增益放大、滤波处理模块一起构成正反馈环路。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。