Abstract
This paper describes a sinusoidal quadrature oscillator circuit using current differencing buffered amplifiers (CDBAs), that features a single-resistance-controlled frequency and current amplitude control. The proposed circuit contains two CDBAs, three resistors, and two grounded capacitors. The oscillation condition (OC) and the oscillation frequency (ω <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">o</sub> ) of the circuit are independently controlled by a single resistor, whereas the oscillation amplitude is electronically controlled by an external DC current. Outputs of two sinusoidal voltages are shifted by 90°. The validity of the proposed circuit has been verified by hardware circuit tests using AD844 based CDBA.
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