A group of a transistor s parameters sufficient to predict circuit impedance are components in its small-signal model.
2.
One reason for this is that the circuit impedance may be too high to pop a circuit breaker quickly to prevent electricution.
3.
An alternative technique to determine the image impedance of port 1 is to measure the short-circuit impedance " Z"
4.
The input impedance is thus the same as the short circuit impedance of �N . Let us call that impedance Z _ { sc }.
5.
SC ( that is, the input impedance of port 1 when port 2 is short-circuited ) and the open-circuit impedance " Z"
6.
Transformer equivalent circuit impedance and transformer ratio parameters can be derived from the following tests : open-circuit test, short-circuit test, winding resistance test, and transformer ratio test.
7.
The image impedance can be expressed in terms of the open-circuit and short-circuit impedances of the filter as \ scriptstyle Z _ i = \ sqrt { Z _ oZ _ s }.
8.
The idea of Miller theorem ( modifying circuit impedances seen from the sides of the input and output sources ) is revealed below by comparing the two situations without and with connecting an additional voltage source V 2.
9.
The circuit impedance, seen from the side of the output source, may be defined similarly, if the voltages " V 1 " and " V 2 " are swapped and the coefficient " K " is replaced by 1 / " K"
10.
If a very high output impedance is required, operating in common base provides a solution, because it stops the negative feedback; e ) because common base interposes a ground between this notional feedback resistance and the input, the performance of the output circuit is less affected by changes in input circuit impedance-this is sometimes useful.
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