Title :
Automatic model refinement of GmC integrators for high-level simulation of continuous-time Sigma-Delta modulators
Author :
Vasilevski, Michel ; Aboushady, Hassan ; Louerat, Marie-Minerve
Author_Institution :
Lab. LIP6/SOC, Univ. of Paris VI, Pierre et Marie Curie, France
Abstract :
A SigmaDelta 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 2nd order SigmaDelta modulator was chosen to visualize performance degradations while the specifications were not achievable.
Keywords :
integrating circuits; sigma-delta modulation; transfer functions; GmC integrators; automatic model refinement; circuit-level knowledge-based tool; continuous-time sigma-delta modulators; symbolic transfer function; transistor small-signal model; Circuit simulation; Computational modeling; Degradation; Delta-sigma modulation; Frequency; Poles and zeros; Sampling methods; Signal design; Transfer functions; Visualization;
Conference_Titel :
Circuits and Systems, 2009. ISCAS 2009. IEEE International Symposium on
Conference_Location :
Taipei
Print_ISBN :
978-1-4244-3827-3
Electronic_ISBN :
978-1-4244-3828-0
DOI :
10.1109/ISCAS.2009.5118376
