High-frequency compensation of frequency-dependent negative resistance

The GIC filter is one of the LC simulation active filters and has the advantages that the element sensitivity is low and the higher-order filter can easily be constructed compared to the single-amplifier active filters. For the high-frequency filter, however, the filter performance may be deteriorated due to the frequency dependency of the operational amplifier represented by the GB product, for example. Several compensation methods have been proposed for the single amplifier filter, while no effective method has been proposed for the GIC. From such a viewpoint, this paper proposes a compensation method for the frequency response of FDNR composed of GIC. The proposed frequency-dependent negative resistance (FDNR) is applied to the actual filter circuit, and it is confirmed that the circuit operates almost as is predicted by the theory.