A behavioral model of A/D converters using a mixed-mode simulator

A mixed-mode behavioral model of analog-to-digital (A/D) converters is described. A generalized model structure is introduced. The basic function of an A/D converter is to convert an analog voltage into a digital code, for example, a binary number. Three conversion methods (successive approximation, flash, and dual integration) which are commonly used in A/D converters are modeled and can be selected simply by specifying a parameter of the model. For brevity, only the successive-approximation method is described. The modeling considerations of various parts in the A/D converter, including the input amplifier, D/A converter, comparator, and the synchronization problem, are described. The model has been implemented in the Saber mixed-mode simulator. Simulation results are given.<
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