In either case , that voltage is unwanted , and it is the job of the measurement system to reject it , while responding to the differential - mode voltage 另外的原因是该电压没有用,是测量系统工作时所抑制的，而只响应差模电压。
Again , consider using amplifiers that exhibit a smooth input bias current transition throughout the applied input common - mode voltage 再者，所用的放大器也要考虑在加到输入端的整个共模电压(范围内)输入偏置电流转换保持平滑。
Because the output voltage of pwm inverter is dissymmetry instantly , the common mode voltage appears as a result 由于pwm变频器的三相输出电压在瞬间并不对称，所以导致电机三相定子绕组的电压矢量和不为零，从而出现共模电压。
This papers mainly study the influence of variable speed drive to the electric submergible pump system , for instance , long motor leads effect and common - mode voltage 本文主要是分析了变频器对潜油电泵系统的影响，特别是长线传输问题及共模电压问题。
When the motor runs in variable speed drive . there will are be resulted in voltage reflection and common - mode voltage , that those may destroy the motor and cable 当潜油电泵机组工作在变频条件下，特别是当今的变频器均采用较高开关频率的器件，会产生电压反射现象及共模电压问题，破坏电机及电缆。
The common mode voltage has high abrupt transformation rate because of the fast switching devices , whose dv / dt can exceed 6000 v / us . under so high dv / dt , the oil film acts as a capacitor and provides a charging mechanism for rotor shaft voltage buildup 由于变频器的高开关频率，导致共模电压具有很高的电压变化率，其dv dt可以达到6000v us以上，在如此高的电压变化率下，润滑油膜充当了电容的作用对转轴进行充电，形成轴电压。
3 . a good result is gotten under the star - hspice simulation . the dc gain is 90 db , the offset voltage is 40 u v while driving 10k , the unity - gain frequency is 10mhz with phase margin 67 , the slew rate is 10w us while driving 10pf 用star - hspice仿真软件对电路仿真，在1 . 5v电源电压、直流10k负载、交流10pf负载的情况下，整个共模电压范围内跨导基本保持恒定，只有18的变化，直流增益90db ，单位增益带宽10mhz ，相位裕度80度，压摆率10v s 。
The thesis has done the widespread investigation and study to the domestic and foreign ’ s technologies of analogy low voltage and low power , and analyzes the principles of work , merts and shortcomings of these technologies , based on the absorption of these technologies , it designs a 1 . 5v low power rail - to - rail cmos operational amplifier . when designing input stage , in order to enable the input common mode voltage range to achieve rail - to - rail , it does not use the traditional differential input pair , but use the nmos tube and the pmos tube parallel supplementary differential input pair to the structure , and uses the proportional current mirror technology to realize the constant transconductance of input stage . in the middle gain stage design , the current mirror load does not use the traditional standard cascode structure , but uses the low voltage , wide - swing casecode structure which is suitable to work in low voltage . when designing output stage , in order to enhance the efficiency , it uses the push - pull common source stage amplifier as the output stage , the output voltage swing basically reached rail - to - rail . the thesis changes the design of the traditional normal source based on the operational amplifier , uses the differential amplifier with current mirror load to design a normal current source . the normal current source provides the stable bias current and the bias voltage to the operational amplifier , so the stability of operational amplifier is guaranteed . the thesis uses the miller compensate technology with a adjusting zero resistance to compensate the operational amplifier 本论文对国内外的模拟低电压低功耗技术做了广泛的调查研究,分析了这些技术的工作原理和优缺点,在吸收这些技术成果基础上设计了一个1 . 5v低功耗轨至轨cmos运算放大器。在设计输入级时,为了使输入共模电压范围达到轨至轨,不是采用传统的差动输入结构,而是采用了nmos管和pmos管并联的互补差动输入对结构,并采用成比例的电流镜技术实现了输入级跨导的恒定;在中间增益级设计中,电流镜负载并不是采用传统的标准共源共栅结构,而是采用了适合在低压工作的低压宽摆幅共源共栅结构;在输出级设计时,为了提高效率,采用了推挽共源级放大器作为输出级,输出电压摆幅基本上达到了轨至轨;本论文改变传统基准源基于运放的设计,采用了带电流镜负载的差分放大器设计了一个基准电流源,给运放提供稳定的偏置电流和偏置电压,保证了运放的稳定性;并采用了带调零电阻的密勒补偿技术对运放进行频率补偿。
The other is the design of amplifier with constant trans - conductance ( gm ) rail - to - rail input stage . when common mode input voltage changes , it provides nearly constant - gm independent of input transistor operating region ( strong , moderate or weak inversion ) , and the quiet nods of the circuit for current addition and the output stage keep unchanged 当输入共模电压变化时,不管它的输入mos差分对管处于强反型区还是弱反型区,输入级的跨度保持不变,而且输入级后面的电流加法电路和输出级的静态工作点也不会随之改变。
