A NEW APPROACH TO MINIMIZE STABILITY FACTOR OF AN AMPLIFIER

Puneet Sharma, Atul Goyal, Mahendra Pindel

Abstract: In this paper, a method is proposed for minimizing stability factor and removing the negative feedback from Self Bias Configuration of an Amplifier. Stability is an important concern in the designing of Amplifier. For stabilization of an Amplifier different biasing techniques are used. Among all biasing techniques Self Bias technique is best but the major drawback is the introduction of negative feedback by Emitter resistance Re . Due to the introduction of negative feedback the gain of an amplifier decreases. An ideal Ammeter has infinite internal resistance so to remove the negative feedback an ideal Ammeter is used instead of Emitter resistanceRe . With the application of proposed method the Stability factor is minimized and coming out to be equal to Unity and the problem of negative feedback is also removed. In this paper the analysis of proposed Self Bias Circuit is done with the help of Thevenin Theorem.

Keywords: Negative Feedback, Stability Factor, Self-Bias Circuit, Amplifier

DOI: https://doi.org/10.15623/ijret.2014.0302023