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Paul Voigt patented a negative feedback amplifier in January 1924, though his theory lacked detail. [4] Harold Stephen Black independently invented the negative-feedback amplifier while he was a passenger on the Lackawanna Ferry (from Hoboken Terminal to Manhattan) on his way to work at Bell Laboratories (located in Manhattan instead of New Jersey in 1927) on August 2, 1927 [5] (US Patent ...
A simple negative feedback system is descriptive, for example, of some electronic amplifiers. The feedback is negative if the loop gain AB is negative.. Negative feedback (or balancing feedback) occurs when some function of the output of a system, process, or mechanism is fed back in a manner that tends to reduce the fluctuations in the output, whether caused by changes in the input or by ...
Negative feedback can be used to correct output errors or to desensitize a system to unwanted fluctuations. [46] In feedback amplifiers, this correction is generally for waveform distortion reduction [47] or to establish a specified gain level. A general expression for the gain of a negative feedback amplifier is the asymptotic gain model.
When negative feedback is used, the circuit's overall gain and response is determined primarily by the feedback network, rather than by the op-amp characteristics. If the feedback network is made of components with values small relative to the op amp's input impedance, the value of the op amp's open-loop response A OL does not seriously affect ...
Figure 1: Ideal negative feedback model; open loop gain is A OL and feedback factor is β. This section describes the step response of a simple negative feedback amplifier shown in Figure 1. The feedback amplifier consists of a main open-loop amplifier of gain A OL and a feedback loop governed by a feedback factor β. This feedback amplifier is ...
Known for. negative feedback. Scientific career. Fields. Electrical engineer. Harold Stephen Black (April 14, 1898 – December 11, 1983) was an American electrical engineer, who revolutionized the field of applied electronics by inventing the negative feedback amplifier in 1927. To some, his invention is considered the most important ...
The distortion and stability characteristics of the circuit are thus improved at the expense of a reduction in gain. (While this is often described as " negative feedback ", as it reduces gain, raises input impedance, and reduces distortion, it predates the invention of the negative feedback amplifier and does not reduce output impedance or ...
Harold S. Black invented the concept of negative feedback amplifiers in 1927. He managed to develop stable negative feedback amplifiers in the 1930s. Harry Nyquist developed the Nyquist stability criterion for feedback systems in the 1930s. Richard Bellman developed dynamic programming in the 1940s. [23] Warren E. Dixon, control theorist and a ...