  In this report, we lay the foundation for amplitude noise and phase noise
analysis in nonlinear devices. We build a theoretical framework that helps us
to analyze extremely difficult problems which include both nonlinearity and
noise of semiconductors. Using our proposed framework, we analytically
calculate the amplitude noise and phase noise of nonlinear RC circuits in the
presence of nonlinear capacitance and conductance. As a more practical example,
we analyze the amplitude noise and phase noise of a common-emitter stage
bipolar transistor.
