Current-input current-output 2nd-order all-pass filter employing two ZC-CITAs

@article{Biolek2010CurrentinputC2,
  title={Current-input current-output 2nd-order all-pass filter employing two ZC-CITAs},
  author={Dalibor Biolek and Viera Biolkov{\'a}},
  journal={20th International Conference Radioelektronika 2010},
  year={2010},
  pages={1-4}
}
Current-mode resistorless 2nd-order all-pass filter employing two active elements and two grounded capacitors is proposed. This filter with low-impedance current input and high-impedance current output enables setting the natural frequency and quality factor via internal transconductances of active elements. The results of SPICE simulations are compared with theoretical frequency responses.