低域通過特性及び高域通過特性を同時に出力可能な超低周波遮断周波数のリープフログフィルタ  [in Japanese] A Very Low Frequency Leapfrog Filter with Simultaneous Low-pass and High-pass Outputs  [in Japanese]

In this paper, we discuss a leapfrog filter with very low cut-off frequency such as 0.1 ［Hz］featuring simultaneous low-pass and high-pass outputs. At first, we introduce a complementary characteristics in a lossless 2-port by means of the scattering matrix and obtain a complementary high-pass output circuit for the leapfrog filter. Next we discuss time-constant expansion using a prescaled integrator. The entire schematic of the proposed simultaneous low-pass and high-pass leapfrog is given and we proved its validity by means of circuit simulations and actual circuit evaluations.

In this paper, we discuss a leapfrog filter with very low cut-off frequency such as 0.1 [Hz]featuring simultaneous low-pass and high-pass outputs. At first, we introduce a complementary characteristics in a lossless 2-port by means of the scattering matrix and obtain a complementary high-pass output circuit for the leapfrog filter. Next we discuss time-constant expansion using a prescaled integrator. The entire schematic of the proposed simultaneous low-pass and high-pass leapfrog is given and we proved its validity by means of circuit simulations and actual circuit evaluations.