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Low‐passband‐sensitivity switched capacitor filters using a parallel connection of two structurally lossless networks
Author(s) -
Gobet ClaudeAlain,
Mitra Sanjit K.,
Petraglia Antonio
Publication year - 1992
Publication title -
international journal of circuit theory and applications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.364
H-Index - 52
eISSN - 1097-007X
pISSN - 0098-9886
DOI - 10.1002/cta.4490200104
Subject(s) - all pass filter , sensitivity (control systems) , control theory (sociology) , lossless compression , passband , electronic engineering , connection (principal bundle) , capacitor , topology (electrical circuits) , prototype filter , computer science , mathematics , low pass filter , filter (signal processing) , algorithm , high pass filter , band pass filter , engineering , electrical engineering , geometry , control (management) , combinatorics , artificial intelligence , data compression , voltage , computer vision
The low‐sensitivity property of IIR digital filters designed using a parallel connection of two allpass sections has already been demonstrated in the past few years. This property is closely related to the use of a particular type of allpass structures, called structurally lossless networks, which remain allpass regardless of the coefficient quantization. In this paper we provide a general theory for the synthesis of low‐passband‐sensitivity switched capacitor (SC) filters using a similar technique. the design of stray‐insensitive structurally allpass SC sections is emphasized, ensuring the passivity property for the overall filter. Design examples are presented with computer simulations and experimental results to compare the performance of the different proposed structures. Analytical sensitivity calculations are also derived yielding useful formulae for the prediction of the filter sensitivities with respect to capacitor ratios, particularly in the stopband.