Ring oscillator having an externally adjustable variable frequency
AssigneeSamsung Electronics Co., Ltd.
InventorDong-Myeong Shin
Life of this patent
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Abstract
The present invention relates to a ring oscillator having a variable frequency allowing its use in a variety of application circuits. The ring oscillator produces an oscillating pulse signal having a frequency adjustable by an external input voltage. The ring oscillator includes an oscillating signal for generating an oscillating pulse signal, a frequency adjusting circuit, and an inverting circuit. The frequency adjusting circuit adjusts the frequency of the oscillating pulse signal responsive to the external input voltage, the external input voltage being different than a source voltage. The inverting circuit inverts the oscillating pulse signal.
Claims21
A ring oscillator, comprising:
- an oscillating circuit including a current mirror means coupled to a first and second capacitor, the oscillating circuit being adaptable to generate an oscillating pulse signal, the first and second capacitor being adaptable to vary a duty cycle of the oscillating pulse signal;
- and
- a frequency adjusting circuit coupled to the oscillating circuit adaptable to vary a frequency of the oscillating pulse signal responsive to an external input voltage, the external input voltage being different than a supply voltage.
A ring oscillator, comprising:
- an oscillator circuit including a current mirror circuit coupled to a first and second capacitor, the oscillator circuit being adaptable to generate an oscillating pulse signal having a duty cycle that is proportional to the first and second capacitor;
- and
- a frequency adjusting circuit adaptable to vary a frequency of the oscillating signal while maintaining constant a duty cycle of the oscillating signal responsive to an external voltage, the external voltage being different than a supply voltage.
Dependencies are inferred from the claim text.