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1. (WO2019045818) JITTER-FREE RING OSCILLATOR
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CLAIMS:

We claim:

1. A ring oscillator, which comprises:

one or more current sources each connected to a supply voltage source; and

a plurality of oscillation elements connected in series in a ring configuration, each oscillation element comprising:

first and second input terminals;

first and second output terminals;

first and second inverters receiving input signals from the first and second input terminals, respectively, and providing output signals on the first and second output terminals, respectively; and

third and fourth inverters, each having an input terminal and an output terminal, wherein the input terminals of the third and fourth inverters are coupled to the first and second output terminals of the oscillator element, respectively, wherein the output terminals of third and fourth inverters are coupled to the second and first output terminals of the oscillator element, respectively, and wherein each of first, second, third and fourth inverters are coupled to the supply voltage source through the current sources.

2. The ring oscillator of Claim 1 , wherein the first and second inverters are each larger than either one of the third and fourth inverters.

3. The ring oscillator of Claim 1 , wherein two or more of the current sources are each connected to a separate group of the oscillator elements.

4. The ring oscillator of Claim 3, wherein the oscillator elements in each group provide output signals that bear a predetermined phase relationship relative to each other.

5. The ring oscillator of Claim 4, wherein the predetermined relationship is one or more times of ±90°.