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A feedback amplifier is one in which a portion of the output is fed back to the system input where it is combined with the input signal. The basic concept is shown in Fig. 7.1. At the amplifier input, the feedback signal which may be a voltage or current is combined with the input signal which is also a voltage or current through a summing or mixing network, and the resulting signal is passed into the amplifier system. The summing network is either a series circuit which mixes feedback voltage with source voltage or a shunt circuit which mixes feedback current with source current while the feedback network is most often a passive network, usually resistive.
- J. Millman, C.C. Halkias, Integrated Electronics: Analog and Digital Circuits and Systems (McGraw Hill, New York, 1972)
- A.S. Sedra, K.C. Smith, Microelectronic Circuits, 6th edn. (Oxford University Press, Oxford, 2011)