The active-R filter technique applied to current-feedback op-amps

The active-R filter technique attracted much interest in the 1970s as a method for implementing continuous-time analog filters. This technique used the internal capacitance of a voltage op-amp to derive the filter transfer function, and showed potential advantages in terms of high-frequency performance and IC integration. However the main disadvantages of the technique were found to be the strong temperature-dependence of the filter centre-frequency, and the limited dynamic range due to op-amp slew rate limitations. By applying the active-R technique to current-feedback op-amps, it is found that these major disadvantages are overcome. Thus the active-R technique applied to current-feedback op-amps seems a very promising method for the implementation of high-frequency integrated analog filter