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By using mathematical method, the model is established, and through analyzing the mathematical model, the variable gain and settling time of the AGC circuit are calculated.

采用数学方法建立数学模型，并通过分析数学模型计算出AGC回路的可变增益和稳定时间，设计了相应的电路并分析了AGC回路对流量测量计算过程的影响。

Variable gain amplifier is an analog circuit, which varies gain, adjusts signal dynamic range and stabilizes signal power.

可变增益放大器是模拟单元电路之一，起着变化增益、调整信号动态范围、稳定信号功率的作用。

According to the comparison of the advantages and the disadvantages of four implementing methods of the variable gain amplifier,the digital potentiometer is selected for the laser receiving circuit and its action process is analyzed.

比较可变增益四种实现方法的优缺点，在激光接收电路中选择使用数字电位器的方法实现可变增益控制，并分析其作用过程。

The FES circuit has a bandwidth of more than 10kHz and a gain which is variable from 20dB to 60dB.

该电路可以适用于Cu ff电极和Shaft电极，可以对中枢神经和周围神经实施不同相位的刺激。

This is good for many years before the motherboard power supply, it is by changing the transistors to achieve the degree of conduction of the transistors of a variable resistor, series circuit in the power supply.

这是好多年以前的主板供电方式，它是通过改变晶体管的导通程度来实现的，晶体管相当于一个可变电阻，串接在供电回路中。

Potentiometer is actually a variable resistor, because of its role in the circuit is to obtain the input voltage into a fixed relationship between the output voltage too, so called potentiometers.

电位器实际上就是可变电阻器，由于它在电路中的作用是获得与输入电压成一定关系得输出电压，因此称之为电位器。

The Al/PAR/Al structure could be described as a simple circuit equivalent to parallel connection of a variable resistor and a capacitor.

Al/PAR/Al结构可以简单等效为电阻与电容的并联，而退火与自然放置将使薄膜结构趋于稳定。

The PGA consists of the differential amplifier with variable source degeneration resistor and the DC-offset correction circuit.

该可编程增益放大器采用源极反馈电阻可变的差分放大器结构，且带有直流漂移校正电路。

The dimmer control circuit also comprises a second variable resistor, for changing phase of trigger signal independent of the first variable resistor.

该调光控制电路还包括第二可变电阻器，其用于独立于第一可变电阻器来改变触发信号的相位。

The dimmer control circuit comprises: three-end bidirectional controllable silicon switch element, comprising grid and turned on by trigger signal of the grid, connecting to AC power supply through lamp load; and a first variable resistor, possessing adjustable resistance and regulating lamp brightness by following modes: changing resistance value of the first variable resistor, changing phase of the trigger signal corresponding to AC voltage waveform, prolonging or shortening turning-on time bucket of three-end bidirectional controllable silicon switch element, thereby changing current provided to the lamp load.

一种调光器及调光控制电路，该调光控制电路包括：三端双向可控硅开关元件，其通过灯负载连接到交流电源，其中，三端双向可控硅开关元件具有栅极，并且由输入到所述栅极的触发信号开启；以及第一可变电阻器，其具有可调节的电阻值，其中，通过以下方式来调节灯负载的亮度：改变第一可变电阻器的电阻值，改变所述触发信号相对于交流电压波形的相位，延长或缩短所述三端双向可控硅开关元件的开启时间段，从而改变了提供给所述灯负载的电流。

Listen,point and check your answers.

听，指出并且检查你的答案。

Warming needle is one of effective treatment methods for knee arthralgia aggravated by cold,and it is simple,safety,so it should be developed in clinical acupuncture and moxibustion extensively.

但以本院科针灸门诊在2005年1月—2006年6月期间共收治膝痛患者100余例，经过临床的诊断后，其中施以温针治疗的48例，疗效显著，报道如下。1临床资料本组病例48