Abstract
A fundamental and novel concept is introduced regarding the independence of variables (such as branch voltages and currents) in an electrical network sinusoidally excited by multiple frequencies. The new concept is characterized by a set of variables called the complex basis. A complex basis of a set X of variables excluding exciting voltages and current is defined to be a minimal subset X/sub B/ of X such that any variable in X can be expressed as a linear combination of variables in X/sub B/ with constant coefficients. Graph-theoretical theorems and a derivation procedure for a complex basis in an active CR network excited by current sources are presented. Then the concept is applied to network-element-value calculation, an essential and important technique in network diagnosis and tuning. Matrices consisting of vectors of variables obtained by varying the network excitation, that is, by varying both the phasor values (the effective values and phases) and the frequency of the exciting currents, are investigated.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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