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2. HP 200A - Wikipedia

   en.wikipedia.org/wiki/HP_200A

   The amplifier's inverting input is the cathode of tube V 1 and the non-inverting input is the control grid of tube V 2. To simplify analysis, all the components other than R 1 , R 2 , C 1 and C 2 can be modeled as a non-inverting amplifier with a gain of 1+R f /R b and with a high input impedance.

3. Negative-feedback amplifier - Wikipedia

   en.wikipedia.org/wiki/Negative-feedback_amplifier

   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 ...

4. Harold Stephen Black - Wikipedia

   en.wikipedia.org/wiki/Harold_Stephen_Black

   He published a classical paper on negative feedback amplifier in 1934, [4] which has been re-printed in the Proceedings of IEEE two times in 1984 and 1999 [5] [6] Inside his 1934 classical paper "Stabilized feed-back amplifiers", he mentioned Harry Nyquist's work on stability criterion because a negative feedback amplifier can be unstable and ...

5. Negative feedback - Wikipedia

   en.wikipedia.org/wiki/Negative_feedback

   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 ...

6. Error amplifier (electronics) - Wikipedia

   en.wikipedia.org/wiki/Error_amplifier_(electronics)

   This electronics-related article is a stub. You can help Wikipedia by expanding it.

7. Asymptotic gain model - Wikipedia

   en.wikipedia.org/wiki/Asymptotic_gain_model

   This amplifier is often referred to as a shunt-series feedback amplifier, and analyzed on the basis that resistor R 2 is in series with the output and samples output current, while R f is in shunt (parallel) with the input and subtracts from the input current. See the article on negative feedback amplifier and references by Meyer or Sedra. [8 ...

8. Parasitic oscillation - Wikipedia

   en.wikipedia.org/wiki/Parasitic_oscillation

   Parasitic oscillation in an amplifier stage occurs when part of the output energy is coupled into the input, with the correct phase and amplitude to provide positive feedback at some frequency. The coupling can occur directly between input and output wiring with stray capacitance or mutual inductance between input and output.

9. Barkhausen stability criterion - Wikipedia

   en.wikipedia.org/wiki/Barkhausen_stability_criterion

   Barkhausen's criterion applies to linear circuits with a feedback loop. It cannot be applied directly to active elements with negative resistance like tunnel diode oscillators. The kernel of the criterion is that a complex pole pair must be placed on the imaginary axis of the complex frequency plane if steady state oscillations should take ...