This research presents the design a new quadrature oscillator using operational transresistance amplifiers (OTRA). The use of OTRA as active elements which offers low parasitic parameters, high slew rate and high bandwidth independent of the gain, precision of oscillating frequency can be achieved. The oscillating frequency and oscillating condition of oscillator can be independently controlled. Also output terminals are possessed low impedance level which can be directly connected to the load without any buffer circuits. Characteristics of the obtained circuit design are simulated by the OrCAD program and they are found to agree well with the theory.
Key words : Quadrature oscillator, Analog signal processing, Operational transresistance amplifier
245 a : Title
การออกแบบวงจรควอดราเจอร์ออสซิลเลเตอร์โดยใช้วงจร OTRA : DESIGN OF QUADRATURE OSCILLATOR CIRCUIT USING OTRAs