“…Many circuits for realizing voltage-mode filters and immittance functions using the operational amplifier (op.-amp.) pole have been published (Soderstrand 1976, Mitra and Aatre 1976, Soliman and Fawzy 1978, Nandi 1978, Ananda Mohan 1980, Saha and Nandi 1980, Schauman et al 1980, Ishida et al 1986, Tsukutani et al 1991, Siddiqi and Ahmed 1991a. However, the circuit for realizing current transfer functions using the op.-amp.…”