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US 6,271,732 B1Granted
Ring oscillator insensitive to supply voltage variations
OwnerFrank Herzelinventor
Life of this patent
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Abstract
A ring oscillator consisting of a plurality of series connected amplifier stages alternatingly energized by first and second voltages negatively correlated to each other. The output of the final amplifier stage is inverted and connected to the input of the first stage. The second voltage is derived from the first voltage by way of an inverting amplifier which is dimensioned to render the total sensitivity K=df/dVDD zero.
Claims5
A ring oscillator for providing for reduced jitter induced by at least one of a supply voltage and substrate voltage, comprising:
- a first plurality of amplifier stages connected to a first source of voltage;
- and
- a second plurality of amplifier stages connected to a second source of voltage negatively correlated to the first voltage.
Dependencies are inferred from the claim text.