Abstract
This paper presents a system model for the representation of amplifiers that cannot be accurately characterized by a classical two pole transfer function. The effects of higher order poles are modeled by an all-pass function added to the conventional two pole model. The accuracy of the model is demonstrated by comparing the results for a typical CMOS amplifier to those obtained from device level simulations using SPICE. This model can be easily implemented in a standard simulator and is shown to achieve fast simulation time. This model is expected to have application in system level modelling of mixed-signal circuits using conventional SPICE simulators.
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