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A Current-Tunable Sinusoidal Quadrature Oscillator Using Signal-Differencing All-Pass Filters

An integrable current-tunable sinusoidal quadrature oscillator is presented. A current-tunable all-pass filter is used as the frequency-selective network. The implementation is fullybalanced so as to enable accurate quadrature signals with symmetry. The oscillation frequency is currenttunable over a wide-freqency sweep range of approximately three orders of magnitude. The quadrature signals possess the amplitude matching and the quadrature phase matching of better than 0.004 dB and 0.15°, respectively. The maximum useful frequency of oscillation is in excess of 8 MHz, and total harmonic distortions can be adjusted easily to be approximately 0.5 percent.