由微分学和回路方程的物理意义讨论h参数

Discuss of h Parameter from the Physical Meaning of Differential Calculus and Loop Equation

由晶体管输入和输出回路的偏微分方程,导出h参数的物理意义,并由此画出输入和输出端的等效电路.

The thesis concludes the relation equation of Ac heft from the loop of the input and output of transistor： △VBE=hie△iB＋hre△VCE △ic=hfe△iB＋Hoe△VCE The left of the equation 1 is a voltage, the two items of the right are certain to be voltage, too, the left of the equation 2 is a circuit, the two items of the right are certain to be two circuit. Seen from this, the physics meaning of h, and hre△Vce, is actually a resistor element and an voltage source. The physics meaning of hfe△iB and hoe is actually a admittance and an circuit source. From this we can draw the equivalent circuit of the input port. It is made up of the serial connection of hie and hre △ Cce On the other hand, the equivalent circuit of the output port is actually made up of the parallel connection of hfe △ iB and hoe.