An analysis of current waveforms in CMOS logic cells for RF mixed circuits

This paper presents an approach for simulation of mixed-signal CMOS integrated circuits, aiming at estimating crosstalk effects, by identifying possible sources of disturbances in analog-digital integrated systems, such as current pulses drawn from voltage supplies. A simple expression of voltage and current in the pull-up and the pull-down of a CMOS logic gate can be derived. A computer program demonstrates the feasibility of the proposed approach, and a representation of digital switching noise in frequency domain has been derived.