A finite-memory discrete-time convolution approach for the nonlinear dynamic modelling of S/HADC devices
A nonlinear dynamic black box model for sample-hold and analogue to digital conversion devices (S/HADCs) is proposed in this paper. It derives from the expansion of a Volterra-like series (previously introduced by authors for the general-purpose modelling of nonlinear dynamic systems) and it is based on a discrete convolution in the time domain, which describes the nonlinear dynamics of the system. The model carries out a functional description of the S/HADC nonlinear behaviour as the sum of two blocks which take separately into account the static and the purely dynamic contributions. Model characterization can be performed by means of a simple and reliable measurement procedure and the model analytical representation allows an easy implementation in the framework of commercial available CAD tools for circuit analysis and design. Preliminary experimental results, which validate the proposed approach, are presented in the paper together with some examples which show model capabilities in characterizing the device nonidealities under both DC and large-signal operating conditions.
nonlinear dynamic model s/hadc device volterra series