Effect of Feedback on Impedance

Autor: R. B. Blackman
Rok vydání: 1943
Předmět:
Zdroj: Bell System Technical Journal. 22:269-277
ISSN: 0005-8580
DOI: 10.1002/j.1538-7305.1943.tb00443.x
Popis: THE impedance of a network is defined as the complex ratio of the alternating potential difference maintained across its terminals by an external source of electromotive force, to the resulting current flowing into these terminals. If the network contains active elements such as vacuum tubes, the resulting current (or potential difference if the input current is taken as the independent variable) may be due in part to the excitation of the active elements. The definition of impedance does not discriminate between the part of the current (or potential difference) due directly to the external source of electromotive force and the part due to the excitation of the active elements by the external source. Hence the impedance will in general depend upon the degree of activity of the active elements.
Databáze: OpenAIRE
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