LC feedback are used in oscillators that require higher frequency and higher Q factor. There are some important disadvantages of RC phase shift oscillators are given below, RC phase oscillators are hard for the Circuit to start oscillations. There are four types of LC oscillators, Armstrong, Clapp, Hartley, Colpitts. As we shall see in the next chapter, if positive feedback is sufficiently large, it leads to oscillations. One important use of positive feedback is in oscillators. It has less phase distortion. • Reduction in gain • Reduction in input resistance in case of current shunt and voltage shunt type amplifiers. But there is much more to the stability story, as forthcoming articles will demonstrate. Transistors are used as amplifiers because of the limitation (lower unity-gain frequency) of Op-amps. There are some advantages of negative feedback amplifier which are given below, It has highly stabilized gain. However, it has the disadvantages of increased distortion and instability. Though the positive feedback increases the gain of the amplifier, it has the disadvantages such as. The output is small because of the smaller feedback. Input and output impedances can be modified as desired. It has less amplitude distortion. Therefore, positive feedback is seldom employed in amplifiers. The output is small because of the smaller feedback. Negative (input or output) impedance amplifiers rely on the appropriate application of positive feedback which are desired in certain applications, but generally speaking, positive feedback is not used in most amplifier circuitry - stability being the issue. An amplifier with a positive feedback can be understood as an oscillator. Negative feedback creates a condition of equilibrium (balance). There are some important disadvantages of RC phase shift oscillators are given below, RC phase oscillators are hard for the Circuit to start oscillations. The use of positive feedback is useful for producing oscillators. The RC phase shift oscillator requires high Vcc. Disadvantages. Now we know why negative-feedback amplifiers are susceptible to oscillation and what condition must be present to ensure stability. Disadvantages One disadvantage of a positive feedback system is that providing employees with such feedback uses valuable time. Increasing distortion; Instability; It is because of these disadvantages the positive feedback is not recommended for the amplifiers. Poor frequency stability. One of the main disadvantages of the basic LC Oscillator circuit we looked at in the previous tutorial is that they have no means of controlling the amplitude of the oscillations and also, it is difficult to tune the oscillator to the required frequency. For an amplifer with positive feedback the gain is given by the expression below. For large feedback. Following are the disadvantages of negative feedback over positive feedback. Positive feedback creates a condition of hysteresis (the tendency to “latch” in one of two extreme states). It can control step response of amplifier. If … It has less harmonic distortion. The condition for positive feedback is that a portion of the output is combined in phase with the input. advantage and disadvantage of positive feedback circuits - 4176236 Chapter 8 - Operational Amplifiers. It can increase or decrease output impedances. Sinusoidal Oscillators - Introduction. The Hartley Oscillator. For an amplifer with positive feedback the gain is given by the expression below. The benefits of LC oscillators are phase stability and low susceptibility to noise. Positive Feedback. The RC phase shift oscillator requires high Vcc. As a matter of fact, an oscillator … There are no disadvantages depending on what you’er attempting to achieve. The use of positive feedback is useful for producing oscillators. An oscillator generates output without any ac input signal. The condition for positive feedback is that a portion of the output is combined in phase with the input. • Increase in output resistance in case of current series and current shunt feedback amplifiers. For large feedback… Positive Feedback. One disadvantage of a positive feedback system is that providing employees with such feedback uses valuable time. An electronic oscillator is a circuit which converts dc energy into ac at a very high frequency. more linear operation. If the positive feedback is sufficiently large, it leads to oscillations, by which oscillator circuits are formed. An oscillator is a device producing an alternating or pulsing output voltage. The positive feedback increases the gain of the amplifier. It has higher fidelity i.e. The employer must prepare, conduct and share the feedback with employees, which can lower productivity. 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