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International Journal of Electronics Volume 93, 2006 - Issue 7
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Original Articles

First-order allpass filter and sinusoidal oscillators using DDCCs

J.-W. Horng Department of Electronic Engineering, Chung Yuan Christian University, Chung-Li, 32023, Taiwan, R.O.C.Correspondence[email protected]
,
C.-L. Hou Department of Electronic Engineering, Chung Yuan Christian University, Chung-Li, 32023, Taiwan, R.O.C.
,
C.-M. Chang Department of Electrical Engineering, Chung Yuan Christian University, Chung-Li, 32023, Taiwan, R.O.C.
,
Y.-T. Lin Department of Electronic Engineering, Chung Yuan Christian University, Chung-Li, 32023, Taiwan, R.O.C.
,
I.-C. Shiu Department of Electronic Engineering, Chung Yuan Christian University, Chung-Li, 32023, Taiwan, R.O.C.
&
W.-Y. Chiu Department of Electronic Engineering, Chung Yuan Christian University, Chung-Li, 32023, Taiwan, R.O.C.
Pages 457-466 | Received 04 Aug 2004, Accepted 01 Dec 2005, Published online: 23 Aug 2006
 
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Abstract

A voltage-mode first-order allpass filter using one differential difference current conveyor (DDCC), one grounded capacitor and one floating resistor is presented. No passive component matching constraints are required. Because the output impedance of the proposed allpass filter is low, the output terminal can be directly connected to the next stage. Using the proposed first-order allpass filter as a basic building block, a new quadrature oscillator and even-phase sinusoidal oscillators can be obtained. The simulation results confirm the theoretical analysis.

Acknowledgement

This work was supported by the National Science Council of the Republic of China under Contract No. NSC 94-2215-E-033-005.

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