Electrical design of Switched-Capacitor second-order high-Q low-pass filter with channel multiplexing
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Journal Title
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Sähkötekniikan korkeakoulu |
Master's thesis
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Authors
Date
2023-05-15
Department
Major/Subject
Micro- and Nanoelectronic Circuit Design
Mcode
ELEC3036
Degree programme
Master’s Programme in Electronics and Nanotechnology (TS2013)
Language
en
Pages
66
Series
Abstract
The aim of this thesis is to design a discrete-time second-order low-pass filter with channel multiplexing for the electronic stability control system. The purpose of this design is to study the current and noise behavior of the multiplexed discrete-time design in comparison to a single-channel continuous-time design. This work discusses the importance of a discrete-time analog filter topology over continuous time in context of integrated area, cost and complexity. It argues about the selection of a ladder-type switched-capacitor filter for the required application and presents the steps for the design from an equivalent RLC filter. It addresses the component design of the selected topology as well as the operational amplifier design. It also discusses the reasons behind the selection of the folded cascode operational amplifier topology for the design. The clocking sequence for the switched-capacitor switches as well as the channel multiplexing switches is explained. The design is verified with simulations and the results of the essential parameters describing the performance of the design are presented. These parameters include the frequency response of the design, current consumption, noise levels, total harmonic distortion of the output signal, and channel isolation between the multiplexed channels. The work is concluded with an explanation of the results and a discussion on the reasons behind out of specification results. Based on this discussion, future work as well as improvements to the existing designs are suggested.Description
Supervisor
Halonen, KariThesis advisor
Sillanpää, TeroKeywords
channel-multiplexing, discrete-time low-pass filter, switched-capacitor, ladder-filter