Multiple-input single-output low-input and high-output impedance current-mode biquadratic filter employing five modified CFTAs and only two grounded capacitors
The proposed current-mode biquadratic filter can realize all five biquadratic filter functions (LP, HP, BP, BS and AP) by selecting different input current signals, without requiring any parameter-matching conditions or additional circuits. The use of only grounded capacitors makes it convenient for integrated circuit implementation. The filter has an orthogonal electronic adjustment of the natural angular frequency ?0 and the quality factor Q. The proposed filter has the feature of high output impedance and low input impedance.
multiple-input single-output biquadratic filter current-mode circuit current follower transconductance amplifier (cfta)