Electronically tunable current-mode biquad filter employing CCCDTAs and grounded capacitors with low input and high output impedance

Authors:  Winai Jaikla, Fabian Khateb, Surapong Siripongdee, Piya Supavarasuwat, Peerawut Suwanjan

Abstract:
In this study, a single-input multiple-outputs current-mode analog biquadratic filter, based on current controlled current differencing transconductance amplifier (CCCDTA) is presented. The proposed filter uses two CCCDTAs and two grounded capacitors without any external resistors, which is well suited for integrated circuit implementation. The filter simultaneously gives 3 standard transfer functions, namely, lowpass, highpass and bandpass filters with independent control of quality factor and pole frequency by electronic method. By summing of IHP and LLP, the notch filter can be also achieved. Moreover, the circuit has low input and high output impedance which would be an ideal choice for cascading in current-mode circuit. The PSPICE simulation results are included verifying the workability of the proposed filter. The given results agree well with the theoretical anticipation.

Keywords:
Current-mode
CCCDTA
Filter
Integrated circuit
Analog circuit

Published in: AEÜ-International Journal of Electronics and Communications (Volume 67, Issue 12, December  2013)

Publisher: Elsevier

ISSN Information: 1434-8411

Electronically tunable current-mode biquad filter employing CCCDTAs and grounded capacitors with low input and high output impedance

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