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New universal filter using only current followers as active elements
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DOI：10.1016/j.aeue.2005.05.015.png)
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Abstract
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A new universal current-mode (CM) biquad filter is presented which can realise all the five standard filter functions namely lowpass, bandpass, highpass, notch and allpass employing only unity-gain current followers (CF) as active elements. The workability of the proposed universal biquad, realised with CMOS unity-gain current followers, is established by SPICE simulations. The new circuit provides explicit CM outputs from high output impedance terminals and possesses a number of advantageous features all of which are not available simultaneously in any of the previously reported CF-based universal biquad filters. (c) 2005 Elsevier GmbH. All rights reserved.
Keywords:
universal filters
current followers
current-mode circuits
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