Therecentlyproposedcurrent-mode(CM)activebuilding block (ABB), namely the current differencing transconductance amplifier (CDTA) [1], has been found to be versatile for CM signal processing and its use has reportedly providedseveralcircuitsolutions. Theseprimarilyconsistof thedesignofCMfilters[2],[3],[4],[5]andsinusoidaloscillators(includingquadratureandmulti-phaseoscillators)[6], [7], [8], [9], [10]. The motivation of this paper is to propose a minimum component CDTA based first-order CM all-pass filter (APF). APFs are very important circuits for many analogsignalprocessingapplicationsandareused,generally,in phase equalization and for introducing a frequency dependent delay while keeping the amplitude of the input signal constant over the desired frequency range [11].
Therecentlyproposedcurrent-mode(CM)activebuilding block (ABB), namely the current differencing transconductance amplifier (CDTA) [1], has been found to be versatile for CM signal processing and its use has reportedly providedseveralcircuitsolutions. Theseprimarilyconsistof thedesignofCMfilters[2],[3],[4],[5]andsinusoidaloscillators(includingquadratureandmulti-phaseoscillators)[6], [7], [8], [9], [10]. The motivation of this paper is to propose a minimum component CDTA based first-order CM all-pass filter (APF). APFs are very important circuits for many analogsignalprocessingapplicationsandareused,generally,in phase equalization and for introducing a frequency dependent delay while keeping the amplitude of the input signal constant over the desired frequency range [11].
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