A Design of Electronically Tunable Voltagemode Universal Filter with High Input Impedance

This article presents a voltage-mode universal biquadratic filter performing simultaneous 3 standard functions: lowpass, high-pass and band-pass functions, employing differential different current conveyor (DDCC) and current controlled current conveyor (CCCII) as active element. The features of the circuit are that: the quality factor and pole frequency can be tuned independently via the input bias currents: the circuit description is very simple, consisting of 1 DDCC, 2 CCCIIs, 2 electronic resistors and 2 grounded capacitors. Without requiring component matching conditions, the proposed circuit is very appropriate to further develop into an integrated circuit. The PSPICE simulation results are depicted. The given results agree well with the theoretical anticipation.

Authors:

• Surapong Siripongdee
• Witthaya Mekhum

Keywords:

• Filter
• DDCC
• CCCII
• Analog circuit
• Voltagemode
• PSPICE

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