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Design of switched-capacitor and wave digital filters with linear phase and high amplitude selectivity

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2 Author(s)
H. Baher ; Dept. of Electr. Eng., Worcester Polytech. Inst., MA, USA ; M. O'Malley

A design technique, and the associated algorithm, are presented for selective linear-phase low-pass and high-pass sampled data filters. The resulting filter transfer functions are particularly suitable for realization as leap-frog lossless discrete integrator (LDI) switched-capacitor structures and also in wave digital form. Due to the specific form of the transfer function, the filters generally have no lumped-element counterparts. The technique leads to an optimum compromise between amplitude selectively and passband phase linearity under the restriction of a prescribed form of the transfer function, and allows the use of finite jω-axis zeros of transmission for achieving high amplitude selectivity. The transfer functions presented are also capable of realization as distributed microwave filters, but these require the use of coupled-wire networks in the form of distributed Brune sections, if jω-axis zeros of transmission are introduced

Published in:

IEEE Transactions on Circuits and Systems  (Volume:37 ,  Issue: 5 )