Noise Analysis of Common-Emitter Amplifier using Stochastic Differential Equation

Abstract: In this paper, we analyse the effect of noise in a common-emitter amplifier working at high frequencies. Extrinsic noise is analyzed using time domain method employing techniques from stochastic calculus. Stochastic differential equations are used to obtain autocorrelation functions of the output noise voltage and other solution statistics like mean and variance. The analysis leads to important design implications for improved noise characteristics of the common-emitter amplifier.

Keywords: common-emitter amplifier, noise, stochastic differential equation, mean and variance.