Another question regarding a problem in Microelectronic circuits 5th ed by Sedra Smith (exercise 1.20)
Please see the attached image. Everything except the green arrow and label is in the original figure
Problem:
Find the input resistance between terminals B and G in the circuit shown in the attached image. The voltage vx is a test voltage with the input resistance Rin defined as Rin = vx / ix
My approach
ix = ib
the currents sum in the point above E in the figure is
ix + βix - ie = 0
Ahh okay, but how do I incorporate that into the Ve-equation? I've been looking around at different methods (DC network analysis methods) but I can't get anyone to work. Could you point me in the right direction?
The circuit diagram in post#1 is a LINEAR small-signal circuit. Therefore, you can apply the superposition method.
It`s one of the fundamental laws which is used to calculate the voltage-current distribution in a circuit with more than one sources.
The circuit diagram in post#1 is a LINEAR small-signal circuit. Therefore, you can apply the superposition method.
It`s one of the fundamental laws which is used to calculate the voltage-current distribution in a circuit with more than one sources.