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Oscillator for providing a constant oscillation signal, and a signal processing device including the oscillator

Image Number 2 for United States Patent #8115559.

An oscillator including a current bias circuit and a ring oscillator. The current bias circuit tracks a temperature change of the oscillator by using a control voltage and generates a plurality of bias voltages to supply a bias current according to the temperature change. The ring oscillator compares differential output signals generated according to the bias voltages and generates an oscillation signal as a result of the comparison.

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