The matrix representation of four-terminal passive networks is briefly surveyed. The methods developed by Brown and Bennett for the representation of vacuum tube circuits as four-terminal networks is extended to the analysis of amplifier and oscillator circuits. The general ABCD matrix for the feedback amplifier is derived and is used to find the gain, the input and the output impedances of a compound feedback circuit. Also the Barkhausen criterion for the feedback oscillator is derived in terms of the ABCD parameters and is applied to the analysis of a general feedback oscillator.
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