Low Frequency Filters Design Based on Frequency Dependent Negative Resistance (FDNR)

In this paper, they study of the difficulties of designing a low frequency filters in using inductors and capacitors. The problems of using this component is the large size, weight and cost. The proposed design is to use a frequency dependent negative resistance (FDNR) as active filter alternative to inductors with a 100Hz cutoff frequency which is suitable in medical and other low frequency applications. The proposed design electronic circuits show that the frequency response of low pass filter is high quality and acceptable results compared with traditional filters.