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This paper describes a current‐mode third‐order quadrature oscillator based on current differencing transconductance amplifiers (CDTAs). Outputs of two current‐mode sinusoids with 90° phase difference are available in the quadrature oscillator circuit. The oscillation condition and oscillation frequency are orthogonal controllable. The proposed circuit employs only grounded capacitors and is ideal for integration. Simulation results are included to confirm the theoretical analysis.
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Jiun‐Wei Horng (2009) studied this question.
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