Importance

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Abstract

Electronic oscillator designs and methods that do not require an accurate voltage and current reference to be provided, and which output an accurate frequency waveform over a range of voltage supply and temperature variations. Embodiments of the present invention are particularly well-suited for IC designs with very limited layout area and a tight oscillator frequency spread requirement. An embodiment uses a current subtraction technique that provides an essentially constant through a bias generation circuit when the voltage of the voltage source exceeds a selected value. An embodiment includes a temperature-compensation circuit, coupled to the bias generation circuit, that includes at least one NFET and at least one negative temperature coefficient resistor and is configured to pass a temperature-compensated current through the at least one NFET. An embodiment includes a ring oscillator that uses paired negative temperature coefficient resistors to provide temperature compensation for at least one ring oscillator stage.

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First Claim