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Scaling techniques for switched‐capacitor filters employing voltage inverter switches
Author(s) -
Pandel Jürgen
Publication year - 1983
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.4490110107
Subject(s) - cascade , filter (signal processing) , scaling , capacitor , parasitic extraction , sensitivity (control systems) , voltage , inverter , connection (principal bundle) , topology (electrical circuits) , electronic circuit , switched capacitor , band pass filter , electronic engineering , attenuation , control theory (sociology) , physics , engineering , mathematics , computer science , electrical engineering , geometry , optics , control (management) , chemical engineering , artificial intelligence
Some realizations of scaling elements in cascade connection with unit elements and gyro‐elements will be described. It will be shown that the voltage distribution inside the filter and the spread of capacitor values can be optimized in two steps using two independent parameters for each scaling element. the influence of these scaling elements is such that the very low sensitivity of the attenuation characteristic with respect to element variations is fully retained despite the fact that according to the usual definition the losslessness of the reference filter is not preserved. the SC circuits described in this paper are insensitive to ‘bottom plate’ parasitic capacitances. Top plate parasitics correspond largely to element variations in the reference filter so that also their influence is strongly reduced. A numerical example of a 14th‐order unit element bandpass filter is given.