Abstract
Abstract When the amplification of an amplifier with feedback is given by the well-known formula A = A 0(1 − βA 0)−1, it is shown that the input impedance, changed by the feedback, can be written as: $ Here Z i0 is the input impedance without feedback and Z g is the generator impedance. The output impedance has the same form, but the output impedance without feedback Z u0 has to be substituted for Z i0 and the load impedance Z b, for Z g. This is valid for connection in series, but for connection in parallel the admittances Y have to be substituted for the impedances Z. It is shown that with the given relations for determining the input and output impedances, a minimum effort of calculation is obtained.
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