Abstract
The paper deals with a novel all-pass filter circuit employing Differential-input Buffered and Transconductance Amplifier (DBTA), two grounded resistors and two grounded capacitors. The proposed all-pass filter functionality is demonstrated on its application in quadrature oscillator, which provides a couple of both voltage and current output signals shifted in phase by 90 ° and equal in amplitude. The frequency of oscillation can be set independently on the oscillation condition. Theoretical behavior of the all-pass filter as well as the whole quadrature oscillator have been verified using PSpice simulation.
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