What This Document Is
This document represents a class session from ELENG 247A, an introductory course to Microelectromechanical Systems (MEMS) at the University of California, Berkeley. Specifically, it focuses on the design and analysis of continuous-time filters, a crucial component in many MEMS-based systems. This session builds upon previous lectures and delves into advanced techniques for filter implementation and optimization. It’s designed to provide a detailed exploration of analog filter design principles within the context of MEMS applications.
Why This Document Matters
This material is essential for students and engineers working with analog signal processing in MEMS. Anyone seeking a deeper understanding of how to create precise and efficient filters for sensor interfaces, data acquisition systems, or communication circuits will find this session valuable. It’s particularly relevant when you need to address challenges related to filter accuracy, linearity, and tuning in integrated circuits. This session is best reviewed after gaining a foundational understanding of continuous-time filter concepts and operational amplifier circuits.
Topics Covered
* Opamp-based filter implementations utilizing MOSFETs and resistors/capacitors.
* Gm-C filter architectures and their advantages.
* Techniques for frequency tuning in continuous-time filters, including trimming and automatic adjustment methods.
* The impact of non-ideal integrator characteristics on filter performance.
* Comparison of Operational Amplifiers (Opamps) and Operational Transconductance Amplifiers (OTAs) for filter design.
* Advanced integrator implementations for improved performance.
* Analysis of filter linearity and distortion characteristics.
What This Document Provides
* Detailed discussion of various integrator designs, including improved MOSFET-C and R-MOSFET-C configurations.
* Illustrative examples of filter applications, such as a 5th Order Bessel Low-Pass Filter.
* References to key research papers and publications in the field of analog circuit design.
* A comparative analysis of different filter topologies and their trade-offs.
* A foundation for understanding the practical considerations involved in building and tuning continuous-time filters.
