输出电流的最终表达式与前面使用npn型晶体管的表达式是一样的。 镜像电流源(Current Mirror)有时也被称为电流镜,是一种利用两个对称的晶体管产生恒流源的电路。不过,镜像电流源一般只应用于集成电路芯片内部的设计(比如运放的设计),很少在分立元件电路中使用。因为分立元器件很难找到两个放大系数一模一样的对称晶体管...
In this project, you will construct and test the simple current mirror of Figure 1 with an adjustable bias current set using a potentiometer. Figure 1. Schematic diagram of a BJT current mirror with an adjustable current. This basic circuit finds wide use due to its simplicity. In this ...
A current mirror circuit includes an input current leg (112) and an output current leg (114). The input current leg includes: a first bipolar junction transistor (BJT) (120) having a collector terminal configured to receive an input current sourced at a current node (104) and a first ...
The measured frequency response data show that bipolar integrated circuit current mirrors, biased at nanoampere DC currents, have current transfer ratios in the range 0.7 to 1 with sufficient bandwidth for use in micropower circuit design. There is close agreement between measured and theoretical data...
circuit with power BJT used in flyback converter was designed.In view of the accuracy of copying with the current mirror,a deep negative feedback loop and cascode structure composed of op-amp and MOS were designed to clamp the circuit,making the current copy to the base of power tuber ...
1.PackageFormofBJT 2.ThetypicalapplicatedcircuitsofBJT 2.1Reverseamplifier2.2Voltagefollower2.3CommonBaseAmplifier2.4DifferentialAmplifier2.5Switch2.6Mirrorcurrentsource2.7Darlington2.8Wallmanbootstrap 3.ThereasonsforwhyBJThastheseapplications 3.1BriefintroductionofBJTstructure3.2Workingprinciplewhenamplifing...
Increasing the load resistor value is what caused the load line to intercept the 75 µA curve at this new point, and it indicates that saturation will occur at a lesser value of base current than before. With the old, lower-value load resistor in the circuit, a base current of 75 ...
current from the circuit is reached when IL*R2= 0.6. This circuit can be used to protect amplifiers (including push pull amplifiers.), power supplies and other circuits; or it can be used as a constant current circuit. This is not a precision circuit; however it is a simple and ...
an emitter coupled to a circuit ground terminal through a first emitter degeneration resistor, and a base, and a second bias transistor coupled with the detecting transistor in a current mirror configuration, the second bias transistor having a base connected to the base of the detecting, transisto...
Extended Abstract: " SPICE (Simulation Program with Integrated Circuit Emphasis) was created at University of California Berkeley as a class project in 1969-70. It evolved to become the worldwide standard integrated circuit simulator. SPICE has been used to train students in the intricacies of circ...