Abstract
The realization of a new multi-functional shadow fractional-order filter (FOF) based upon operational transcon-ductance amplifier (OTA) is proposed in this paper. The shadow FOF consists of a basic 2a FOF and an external amplifier with gain A. The filter parameters such as pole quality factor <tex>$Q$</tex> and pole frequency f<inf>0</inf> can be regulated with the help of external amplifier's gain, without changing the active or passive components of basic FOF. The proposed shadow FOF offers fractional-order high-pass filter (FHPF), fractional-order low-pass filter (FLPF) and fractional-order band-pass filter (FBPF). The three cases of stability with different feedback signals are discussed and simulation results are presented. The simulations are accomplished using SPICE with 180nm CMOS technology model parameters. Corner analysis and Monte-Carlo analysis are also executed to verify the robustness of the proposed shadow FOF.
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