tailieunhanh - Model-Based Design for Embedded Systems- P72

Model-Based Design for Embedded Systems- P72: This book contains information obtained from authentic and highly regarded sources. Reasonable efforts have been made to publish reliable data and information, but the author and publisher cannot assume responsibility for the validity of all materials or the consequences of their use. | 21 Smart Sensors Modeling Using VHDL-AMS for Microinstrument Implementation with a Distributed Architecture Carles Ferrer Laura Barrachina-Saralegui and Bibiana Lorente-Alvarez CONTENTS Introduction . 697 Architecture . 698 Design Methodology for MEMS Design . 700 Application . 702 Accelerometer . 704 Description of the Accelerometer . 704 Output Circuitry . 706 IBIS Drivers . 708 Interface of the Accelerometer . 711 Gyroscope . 711 Smart Sensor Simulation . 714 IBIS Drivers in Sensors . 714 Interface of the Gyroscope . 715 Simulation and Validation . 717 Conclusions . 717 Acknowledgments . 717 References . 718 Introduction The growing importance of microelectromechanical systems MEMS in a wide range of applications which combine extreme sensitivity accuracy and compactness has evidenced the need to simplify the design process in order to reduce the design time and cost. One of the possible solutions for MEMS design is the extension of the use of an integrated circuit design methodology to obtain a top-down design methodology that is possible thanks to the new available mixed-signal modeling languages such as VHDL-AMS 1 analog and mixed-signal extension of VHDL language 697 698 Model-Based Design for Embedded Systems which allows developing models that combine not only digital and analog signals but also thermal mechanical and optical signals. The main step in the process of designing for MEMS integration is to combine VHDL models with VHDL-AMS models to obtain a complete description of the multitechnological system. Considering a simplified design flow for mixed-signal models the first step will be to define initial specifications including environment and technical characteristics. The next step is to define interfaces and partitioning into basic components including sensors actuators analog and digital circuitry to design an abstract structure that meets the initial .

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