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Automatic Model Refinement of GmC Integrators for High-Level Simulation of ContinuousTime Sigma-Delta Modulators

By Michel Vasilevski, Hassan Aboushady and Marie-minerve Louerat


Abstract—A Σ ∆ GmC integrator refinement flow is presented. The classically simplified GmC integrator small-signal model was upgraded to be extremely accurate by considering the complete transistor small-signal model. A circuit-level knowledge-based tool was used to execute the designer defined sizing procedure and to extract small signal parameters. By associating the symbolic transfer function to small-signal parameters, the flow, entirely implemented with C++, is able to compute poles and zeros to permit precise behavioral simulations. A 2 nd order Σ∆ modulator was chosen to visualize performance degradations while the specifications were not achievable. a1 K(s+z1)(s+z2) (s+p1)(s+p2

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Year: 2009
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