University of Twente Student Theses


Passive Complex-Pole Switched-Capacitor Filters

Szewczyk, J. (2019) Passive Complex-Pole Switched-Capacitor Filters.

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Abstract:The areas concerning the reconfigurability and size reduction of filter circuits start to grow in importance in the field of wireless receivers. For this reason there is an increased interest in the capabilities of passive switched-capacitor filter architecture. This research provides a complete analysis of the 2nd and 3rd order low-pass passive complex-pole switched-capacitor filter. The analysis gives the derivations for the filter transfer function by means of the simplified passive switched-capacitor model and verifies them by applying the ”Adjoint Network” approach in LTspice simulations. Results from the analysis show that the Q-factors for both filters are restricted to a maximum. In case of the 2nd order filter this is 0,7071 and for the 3rd order 1. Furthermore, it turns out that the filter bandwidth is reconfigurable. The comparison between the calculations and filter simulations implies that there is an increase in cut-off frequency error. This error rises from 0,4% for the 2nd order filter to 15% for 3rd order.
Item Type:Essay (Bachelor)
Faculty:EEMCS: Electrical Engineering, Mathematics and Computer Science
Subject:53 electrotechnology
Programme:Electrical Engineering BSc (56953)
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