Pole frequency and pass-band gain tunable novel fully-differential current-mode all-pass filter
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KünyeHerencsar, N., Jerabek, J., Koton, J., Vrba, K., Minaei, S., & Göknar, İ. C. (2015). Pole frequency and pass-band gain tunable novel fully-differential current-mode all-pass filter. In 2015 IEEE International Symposium on Circuits and Systems (ISCAS) (pp. 2668-2671). Piscataway, NJ: IEEE. http://dx.doi.org/10.1109/ISCAS.2015.7169235
In this paper, a new realization of a fully-differential (F-D) first-order all-pass filter (APF) operating in current mode (CM) is presented. In the proposed F-D CM APF a single adjustable current amplifier (ACA) and two current followers (CFS) with non-unity gain are used as active building blocks. Considering the input intrinsic resistance of CFS as useful active filter parameter, the proposed filter employs only a floating capacitor as external passive component. The pole frequency of the proposed resistorless circuit can be tuned via mutual change of input intrinsic resistance of CFS while the filter pass-band gain by means of gain of ACA. The theoretical results are verified by SPICE simulations, where TSMC 0.18 μm level-7 SCN018 CMOS process parameters were used.