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Low-sensitivity active filter realization using a complex all-pass filter

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2 Author(s)

A wide class of continuous-time transfer functions may be implemented as the parallel combination of two all-pass filters, including Butterworth, Chebyshev, and elliptic low-pass approximations of odd order. Here, we consider the realization of even-order low-pass classical approximations and show that they may be decomposed in terms of complex all-pass functions. A systematic realization approach, based on scattering domain simulation (i.e., wave active filters), allows for a low-sensitivity active filter implementation. Further insight into the low-sensitivity property is gained by connecting the insertion loss of doubly terminated antimetric networks with the imaginary return loss of complex lossless networks.

Published in:

Circuits and Systems, IEEE Transactions on  (Volume:34 ,  Issue: 4 )

Date of Publication:

Apr 1987

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