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Needless to say that simplifications and factorization can be undertaken especially to arrange the numerator with an inverted zero and keep a simple \$1 + s\tau\$ type of denominator. I have gathered all the results and the transfer function in the below Mathcad sheet.
#Input impedence circuit maker 2000 how to#
The problem is that it is not a classic scheme and I don't know how to compute the input impedance (i.e.
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The new circuit from which time constants must be determined is now:ĭoing this exercise also requires a few equations to obtain the time constants you want. Given current gain (hfe 100), internal resistance (hie 2000), reverse voltage gain and output resistance (hre hoe 0), compute input impedance for the following circuit. When it is nulled, the current source can be replaced by a short circuit. The response is the voltage \$V_T\$ generated across the current source. However, for the sake of later rearranging the results, I place a finite-value resistance \$R_\$.įor the zero, you have to null the response. Clearly, when \$C_1\$ is open-circuited, the input impedance is infinite. The first step is to determine the resistance in dc, when all the caps are open. You have two energy-storing elements, this is a second-order circuit. The FACTs will lead you to the answer by determining the time constants involving each of the energy-storing elements of this circuits, \$C_1\$ and \$C_2\$. Well, you can apply the brute-force method or the fast analytical circuits techniques known as FACTs. Now the question is "how to determine the input impedance of this circuit?". This is what is shown below where I have left \$C_3\$ out and considered an unloaded circuit: To determine the input impedance of this circuit, it is necessary to replace the bipolar transistor by its hybrid-pi model.