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Synthesis of Cascadable DDCC-Based Universal Filter Using NAM

Department of Electronic Engineering, National Kaohsiung University of Applied Sciences, Kaohsiung 807, Taiwan
Department of Physics, University of Dalat, Dalat City, Vietnam
Department of Electronic Engineering, Kun Shan University, Tainan 710, Taiwan
Author to whom correspondence should be addressed.
Academic Editor: Takayoshi Kobayashi
Appl. Sci. 2015, 5(3), 320-343;
Received: 9 July 2015 / Revised: 2 August 2015 / Accepted: 4 August 2015 / Published: 11 August 2015
(This article belongs to the Special Issue Feature Papers)
PDF [834 KB, uploaded 11 August 2015]


A novel systematic approach for synthesizing DDCC-based voltage-mode biquadratic universal filters is proposed. The DDCCs are described by infinity-variables’ models of nullor-mirror elements which can be used in the nodal admittance matrix expansion process. Applying the proposed method, the obtained 12 equivalent filters offer the following features: multi-input and two outputs, realization of all five standard filter functions, namely lowpass, bandpass, highpass, notch and allpass, high-input impedance, employing only grounded capacitors and resistors, orthogonal controllability between pole frequency and quality factor, and cascadable, low active and passive sensitivities. The workability of some synthesized filters is verified by HSPICE simulations to demonstrate the feasibility of the proposed method. View Full-Text
Keywords: voltage-mode; universal filter; cascadable; NAM; DDCC voltage-mode; universal filter; cascadable; NAM; DDCC

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Tran, H.-D.; Wang, H.-Y.; Lin, M.-C.; Nguyen, Q.-M. Synthesis of Cascadable DDCC-Based Universal Filter Using NAM. Appl. Sci. 2015, 5, 320-343.

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