Novel BiCMOS sinh-domain filter topologies, derived according to operational emulation and component substitution techniques of the corresponding passive prototype filters, are introduced in this paper. This has been achieved by utilizing BiCMOS nonlinear transconductor cells and an appropriate set of complementary operators for transposing the corresponding equations into the sinh domain. An attractive benefit of the proposed filter topologies is their capability for operating in a low-voltage environment. The performance of a leapfrog sinh-domain filter has been compared, using the Analog Design Environment of the Cadence software, with those of the corresponding log-domain and operational transconductance amplifier (OTA)-C filters.

SUMMARYA new systematic method for designing Sinh-Domain filters is introduced in this paper. This is achieved by employing an appropriate set of complementary operators, in order to transpose the conventional functional block diagram representation of each linear operation to the corresponding one into the Sinh-Domain. The proposed method offers the benefits of facilitating the design procedure of high-order Sinh-Domain filters and of the absence of any restriction concerning the type and/or the order of the realized filter function. As an example, a third-order Sinh-Domain leapfrog filter is designed by employing the proposed set of operators. Two possible realizations are given and their performance has been evaluated and compared through simulation results.

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A new systematic method for designing Sinh-Domain linear transformation (LT) filters is introduced in this article. For this purpose, a substitution scheme containing the Sinh-Domain LT equivalent of each passive prototype has been introduced. The proposed equivalents have been realised by employing appropriate Sinh-Domain building blocks with low-voltage operation capability. As an example, a third-order Sinh-Domain elliptic LT filter has been designed and its performance has been evaluated through simulation results. In addition, a detailed comparison with the corresponding Sinh-Domain and log-domain counterparts has been performed and the obtained results have been further discussed.