Synthesis of a Complex Filter Excluding Inductors with Transmission Zeros at an Arbitrary Frequency This paper proposes a complex filter excluding inductors with transmission zeros at an arbitrary frequency. Even though the attenuation characteristics of the proposed complex prototype filter and those of the conventional one including inductors are the same, the proposed complex prototype filter includes no inductors. The required elements can be reduced when the proposed prototype complex filter is realized by using Negative Impedance Converters (NICu0027s). Compared with the required active elements of conventional circuits, those of the proposed one are 50% or less. The experimental result agrees well with the ideal response. The calculation results of the sensitivity characteristics are shown.

Systematic Design of PseudoDifferential Frequency Filter In the paper, the theory of systematic design frequency filters is described. The result is a fourthorder pseudodifferential frequency filter operating in the voltagemode and implemented as a cascade connection of two basic secondorder blocks. The filter is able to realize the lowpass filtering functions. The basic block employs three active elements and four passive elements. The filter is characterized by a minimum number of passive elements and high output impedance. Filter analysis examines the magnitude, phase, commonmode rejection ratio signal, and behavior of filters while reducing the recommended voltage. The proper functionality of the filter is verified by simulations and experimental measurements for two different interconnections.