It has also been noted that negative feedback will make a gain in a circuit to be stable. Moreover, research has it that the negative feedback is a fundamental principle as far as the operation of an amplifier is concerned. This is based on the fact that it can be used in creating practical circuits given its characteristic of setting up rates, gains, alongside other significant parameters. Thus, an op-amp circuit without a feedback lacks a corrective mechanism and this causes the output voltage to become saturated with a tiniest amount of the differential voltage that is applied in the inputs. More significantly, it is argued that negative feedback can make the circuits self-correcting and stable given that operates on a principle that state that the output drives in such a direction creating an equilibrium condition. It is also evident from research that negative feedback helps in limiting the input signal of an amplifier, thereby, improving its fidelity. It can, as well be used for purposes of increasing the amplifier’s frequency response. This way, the amplifier’s gain does decrease whenever the frequency limit is approached. In practice, with the negative feedback in use, the feedback signal reduces while the input signal increases. This implies that at certain limits of the frequency response of an amplifier, a smaller feedback implies that the gain with feedback or the effective gain. This helps improve frequency response of an amplifier.This is a feedback in which, the current or voltage feedback is applied in order to increase the voltage input. It is commonly referred to as direct or regenerative feedback. Applying a positive feedback in a circuit, make it possible to take a portion of the output signal back to the input especially for the non-inverting signal. The lack of a positive feedback in a circuit slows down the response of the open loop detectors. This way, on the overall, the positive external feedback could be applied although somewhat different from the internal feedback which could be set in the latter purpose-designed stages. This has a far reaching influence on the zero-crossing point of detection accuracy.In the circuit below, the feedback network for the resistor R2 and capacitor C2 combines with a fraction of the Q1 output signal back to the input. Given that the output signal appears to be 180
Nurst, B. (1999). The Behavior Experimental Analysis. American Scientist, 45(4), 343-371
Port, M.(2006). The Fifth Discipline: The Art and Practice of the Learning Organization. New York: Doubleday.
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