Multiphase oscillator circuit
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United States of America Patent
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Sep 1, 2020
Grant Date -
Jul 2, 2020
app pub date -
Dec 28, 2018
filing date -
Dec 28, 2018
priority date (Note) -
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Abstract
In described examples, a ring oscillator includes a series of N stages in a first ring. Each stage includes a respective output terminal coupled to a respective input terminal of a next one of the stages in the first ring. N is a positive odd-numbered integer of at least three. A series of N level shifters in a second ring are respectively connected to the N stages. Each level shifter receives a respective clock output from a respective output terminal of a stage to which it is connected and generates a respective boosted clock output in response thereto. The boosted clock output is coupled to control an impedance state of a next one of the level shifters in the second ring.
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