IMPROVEMENT AMPLIFIER STABILITY ANALYSIS

摘要

In this paper, we present a compensation method for multistage amplifiers, based on a capacitance and a transconductance element in series configuration. Using this topology, the amplifier has a better stability, which is one of the main concerns in designing multistage amplifiers. In addition, this amplifier requires low voltage power supply. This makes it very suitable for using in integrated circuit where the power supply voltage is low. The proposed compensation technique is presented in comparison with the classical Miller method, which use only a simple capacitance to obtain a frequency compensation for the amplifier. In our implementation, we use in addition supplementary feedforward stages to obtain extra transconductances (Gm) thus for a better frequency behavior. This supplementary stages may be considerate as much hardware as a conventional amplifier but reading this article it can be easily see that that this intricacy has no significance and lead to better performance.