Design methodology, modeling and efficient simulation of high performance micro-electromechanical sigma-delta modulator used for MEMS accelerometer are presented. The method is based on converting continuous-time model of the MEMS sensor and eventual analog loop filter into discrete time equivalent using impulse invariant transformation. The methodology is valid for any “MEMS based cantilever” sensor operating in a closed loop, where mechanical transfer function does not provide adequate noise shaping to reach high accuracy and resolution. Using proposed methodology makes possible to efficiently design, predict the behavior and stability of the loop and perform efficient system level simulations.
B.03 Paper at an international scientific conference
COBISS.SI-ID: 8546900In this paper we discuss a methodology for efficient real-time measurements of high-resolution mixed-signal circuits implemented on the IC. The methodology could be used for real time built-in self-tests of a fail-safe mixed-signal integrated circuits and as a measurement part of a self-aware algorithm and methodology for integrated mixed-signal circuits. We show that a pseudo-random noise signal is a good option for the signal source and that the methodology leads to the efficient and cost-effective measurements in real time. The measurement is running in parallel to the main signal processing. The method is theoretically analyzed and verified using Matlab models and simulations. The responses of the models of example high precision, high order Σ-Δ ADC including most important non-ideal circuit effects are compared to the response of a bit-true model of a reference digital circuit. The differences are demonstrated using simple area-efficient cross-correlation algorithm that can be implemented in software or in digital hardware.
B.03 Paper at an international scientific conference
COBISS.SI-ID: 8249172This book chapter explains how to model, design, and simulate mixed-signal circuits efficiently using Matlab and Simulink. Generally, analogue and digital parts, and possibly even the sensors, are modelled according to the needs. At the beginning of the design process, only high-level models are used; non-ideal effects are not yet implemented and only basic functionality is checked. For example, a transfer function for linear circuits can be used to verify the concept and later on, non-ideal effects are added to the model to verify parameters of analogue circuit implementation. For the digital part, only a discrete time model with double precision of variables are used at the beginning, while later on, a bit-true model is used. In this way, it is possible to verify the correctness of the design at an early stage of the design process. Since a complete mixed-signal circuit is verified on a high hierarchical level, it is possible to simulate all parts of the circuit at the same time and in a very short time. In this way, the efficiency of the design process is highly improved and the design time is shortened. The main objective of this chapter is to explain how we can model and simulate mixed-signal circuits in an efficient way.
F.02 Acquisition of new scientific knowledge
COBISS.SI-ID: 8683860