A system and method are disclosed for processing a signal propagated through a nonlinear channel. A pulse width modulation circuit generates a first pulse signal having a duty cycle that is in accordance with an output voltage of a regulator circuit. A top semiconductor die is disposed above the substrate. The method further includes hydrogenating and deoxygenating at least one of the C16 or shorter fuel esters to obtain a jet fuel blend stock and the C16 or longer fuel esters to obtain a diesel blend stock.