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1-半导体基础知识解析.ppt
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* * * * 备注 晶体管的三个工作区域 晶体管工作在放大状态时，输出回路的电流 iC几乎仅仅决定于输入回路的电流 iB，即可将输出回路等效为电流 iB 控制的电流源iC 。 状态 uBE iC uCE 截止 ＜Uon ICEO VCC 放大 ≥ Uon βiB ≥ uBE 饱和 ≥ Uon ＜βiB
≤ uBE 四、温度对晶体管特性的影响 五、主要参数
直流参数：
、ICBO、 ICEO c-e间击穿电压 最大集电极电流 最大集电极耗散功率，PCM＝iCuCE 安全工作区
交流参数：β、α、fT（使β＝1的信号频率）
极限参数：ICM、PCM、U（BR）CEO 1.4　场效应三极管 FET
　　只有一种载流子参与导电，且利用电场效应来控制电流的三极管，称为场效应管，也称单极型三极管。 场效应管分类 结型场效应管 绝缘栅场效应管 特点 单极型器件 一种载流子导电 ；
输入电阻高； 工艺简单、易集成、功耗小、体积小、成本低。 D S G N 符号 1.4.1　结型场效应管 一、结构 图 1.4.1　N 沟道结型场效应管结构图 N型沟道 N型硅棒 栅极 源极 漏极 P+ P+ P 型区 耗尽层 PN 结
　　在漏极和源极之间加上一个正向电压，N 型半导体中多数载流子电子可以导电。 　　导电沟道是 N 型的，称 N 沟道结型场效应管。 P 沟道场效应管 图 1.4.2　P 沟道结型场效应管结构图 N+ N+ P型沟道 G S D P 沟道场效应管是在 P 型硅棒的两侧做成高掺杂的 N 型区 N+ ，导电沟道为 P 型，多数载流子为空穴。 符号 G D S 二、工作原理 N 沟道结型场效应管用改变 UGS 大小来控制漏极电流 ID 的。 G D S N N型沟道 栅极 源极 漏极 P+ P+ 耗尽层 　　*在栅极和源极之间加反向电压，耗尽层会变宽，导电沟道宽度减小，使沟道本身的电阻值增大，漏极电流 ID 减小，反之，漏极 ID 电流将增加。 *耗尽层的宽度改变主要在沟道区。 　　1. 设UDS
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你可能喜欢Q-Bean的工作频率为2.4GHz，一条线有150英尺的视线范围。
The Q-Bean works on a 2.4 GHz frequency with a line of sight range of 150 feet.
操作监视告警器上的开关，工作频率就会自然产生变化。
90】 A change in the operating frequency is easily accomplished by operating a switch installed on a monitoring alarm.
但是，不断增加的工作频率和带宽，将为如砷化镓和氮化镓等化合物半导体打开一扇大门。” (工业和信息化部电子科学技术情报研究所 陈 皓)
However, increasing operating frequencies and bandwidths will open the doors for compound semiconductor technologies such as gallium arsenide and gallium nitride.
详细信息：高传输功率，工作频率宽，性能问题。适用于电话机、真机、CD、VD音响设备中。
Audio transformer : Large transmission power, wide frequency range, stable performance. Used for telephone, fax machine, VCD, DVD, and audio etc.
毫米波雷达与微波雷达相比，在工作频率、天线、大气传输特性和跟踪精度等方面均有其独特的优点。
Millimeter wave radar has had its peculiar advantages as compared with centimeter wave radar at working frequency, antenna, atmospheric transmission features and tracking precision.
继电器往往会以开关时间规定一个重复率，或者说是工作频率，使用时需低于该值。
A repetition rate, or operating frequency, lower than that allowed by the switching times is often specified for a relay.
基于这些方程，研究了实现软开关的条件，并从关断损耗和占空比丢失的角度探讨了吸收电容与电路最高工作频率的关系，给出了工程设计公式。
Based on the equations, the condition of ZVS is analyzed, and the engineering design method of highest working frequency is discussed, which is based on dissipation of turning off and duty cycle lose.
英特尔涡轮增压监视器显示该处理器最高工作频率在过去一秒钟，随着频率的增加了蓝色栏中。
The Intel Turbo Boost Monitor displays the maximum operating frequency of the processor in the past one second, with the increase in frequency shown in a blue bar.
较低的工作频率或改变占空比可实现这一目的。
A lower operating frequency or altered duty cycle accomplishes this.
根据外套壁厚和裂纹位置特点，提出了专用超声换能器的设计关键在于工作频率和晶片倾斜角。
It was pointed out that the keypoint in designing the special transducer was its working frequency and crystal angle according to the coat thickness and flaw location.
该文介绍一种用来测量电源系统工作频率的新方法。
This paper describes a new technique for measuring the operating frequency of a power system.
结果表明，所设计的直流开关型变换器集成模块输出电压稳定、纹波小、工作频率，高、功耗低，且体积小。
It has been shown that the designed DC switching mode converter has a stable output voltage frequency, small ripple, high operating frequency and low power consumption.
由理论分析和试验，给出了最佳灵敏度时换能器的工作频率和晶片倾斜角，实际应用效果良好。
The working frequency and crystal angle for optimal sensitivity were obtained by theoretic analysis and experiments. Its practical application was satisfactory.
常规的测量电源系统工作频率的方法易受噪声和谐波的影响。
The common method of measuring a power system operating frequency is easily affected by the noise and harmonics.
随着窄脉冲形成技术的发展，取样器上限工作频率也越来越高，能够满足对高频段信号的取样要求。
With the continual development of the pulse formation technology, the upper_limit operating frequency of the SPD becomes higher and higher, and can satisfy our request of higher operating frequency.
一般来说，合适的法兰尺寸随被测材料的电磁参数，样品厚度和工作频率而变化；
The results have shown that a flange size varies, in general, with the EM-parameters of the sample under test, sample thickness and the operating frequency.
利用D触发器和锁存脉冲产生电路控制电台工作频率、功率、工作信道。
The operating frequency, the operating channel and power of the radio set was controlled with D trigger the circuit generated latch-pulse.
为了实现开关磁阻电机（SRM）绕组电流或磁链的精确控制，必须提高SRM功率变换器的工作频率以提高系统的动态响应速度。
To achieve the precision control of phase current or phase flux linkage in switched reluctance motor (SRM), the higher switching frequency of converter is required to increase dynamic response speed.
由于时钟工作频率减半及所需工作电压的降低，可使系统功耗明显减少。
By using the half working frequency of the clock and reducing the voltage of the circuits, power dissipation of the system can be reduced evidently.
系统保留了传统串级控制系统克服内回路扰动、提高系统工作频率的优点。
The system has retained the advantages of traditional cascade control systems, which consist of overcoming inner-loop disturbances and increasing the working frequency of the system.
CPU电源管理说明了如何调整处理器的工作频率，从而节省大部分能量而不会明显降低性能。
CPU Power Management shows how to adjust the processor's frequency to save a maximum of energy without losing too much performance.
操作监视告警器上的开关，工作频率就会自然产生变化。
A change in the operating frequency is easily accomplished by operating a switch installed on a monitoring alarm.
本文综合分析了这种新体制雷达的工作频率选择，其结论对超宽带雷达系统设计与研制有实用价值。
This paper analyzes the frequency selection to this new system radar, the conclusions are of great value to design ultra-wideband radar.
该电路集成一个高效功率MOS开关管，三种可选择的工作频率，最高工作效率可以达到85%以上。
This Boost DC-DC converter with N-channel switching MOSFET can generate three working frequencies for using , the efficiency is up to 85%.
仿真结果证实模块化超导储能系统能够在较低工作频率下精确控制电压质量。
Computer simulation approved that the modularized SMES system can compensate power line voltage and eliminate harmonics under lower frequency.
因此，工作频率的变化对超声马达的输出特性有着非常重要的影响。
Driving frequency is one of the most important factors, which determines the performances of ultrasonic motor.
结果证明该方法和装置能够使旋转工作频率下转子的不平衡振动大大减小。
The experiment results confirm that the unbalancing vibration of rotor in working rotational frequence is greatly extenuated by using above method and device.
基于T型滤波器的调光方法，能在很窄的工作频率范围内实现深度调光，同时具有灯电流波峰因数低的优点。
Based on T type filter, the new ballast can achieve a wide dimming range with a very narrow frequency variation range, and it can operate with low lamp current crest factor.
这种关系表明雷达可用的信号带宽是有一定限制的，随着工作频率的下降和成像斜角的增大，可用的信号带宽会变得越来越小。
The relationship shows that the maximum bandwidth is limited for these algorithms and becomes narrow when the center frequency is lower and the imaging squint angle is larger.
这种关系表明雷达可用的信号带宽是有一定限制的，随着工作频率的下降和成像斜角的增大，可用的信号带宽会变得越来越小。
The relationship shows that the maximum bandwidth is limited for these algorithms and becomes narrow when the center frequency is lower and the imaging squint angle is larger.
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