Tatsuya Fujii; Fujihiko Matsumoto; Kazuhiro Shouno
Published in: 2019 34th International Technical Conference on Circuits/Systems, Computers and Communications (ITC-CSCC)
Abstract:
Because of the widespread use of wearable devices, low frequency and low power circuits are required in the field of biomedical signal processing. Low frequency active filters require not only high resistances but also high capacitances. It is known that high capacitances can be realized by using impedance scaling techniques. In this paper, a very low frequency lowpass filter with finite transmission zeros realized by using an Extended Symmetrical Impedance Scaling Circuit (ESISC) is proposed. Utilizing the ESISC, power consumption of this filter is reduced without degradation of the frequency characteristics. As an example, a third-order lowpass filter with an inverse Chebyshev response is designed. The validity of the proposed method is confirmed through computer simulation. Power consumption of the proposed circuit is compared with that of the conventional one.
https://ieeexplore.ieee.org/document/8793351/authors#authors
