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Odd-Order Current-Mode Lowpass Filters with Finite Zeros

Federico Gálvez-Durand

A novel analogue continuous-time current-mode filter synthesis technique is proposed based on a transformed set of state-equations that allow the utilization of only current-mode integrators; current-mode gyrators specifically designed are not necessary. The technique has been successfully used for synthesizing a 5th order low-pass elliptic filter from a passive doubly loaded ladder prototype. Only grounded capacitors are necessary; all floating capacitors and inductors are replaced with active simulations. Small-signal analyses have shown this filter performs well, preserving the low sensitivity inherent to the passive ladder prototype.

http://csdl.computer.org/dl/proceedings/sbcci/1999/0387/00/03870060.pdf

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