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Negative Feedback (NFB) in an electronic amplifier was invented by Harold Stephen Black (US patent 2,102,671 (issued in 1937) ). The idea of this invention is simple: If the loop gain is large, overall response of the whole system can be very close to inverted feedback network response. As feedback network can be simple a passive, high degree of stability and linearity can be obtained. The most widely-known realisation of this principle in electronics are circuits based on Operational Amplifier s. One way to model negative feedback amplifiers is the Asymptotic Gain Model . SEE ALSO NOTES |
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