Time-to-digital converter
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United States of America Patent
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Aug 11, 2015
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N/A
app pub date -
Apr 17, 2015
filing date -
Apr 17, 2014
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Abstract
A time-to-digital converter includes a first gated ring oscillator, a second gated ring oscillator, a phase adjusting unit, and a digital converter unit. The first gated ring oscillator includes a plurality of first delay cells connected in a cyclic structure and operating in response to an enable signal. The second gated ring oscillator includes a plurality of second delay cells connected in a cyclic structure and operating in response to the enable signal. The phase adjusting unit adjusts a phase of a second circulation signal circulating in the second gated ring oscillator so as for the second circulation signal to have a predetermined phase difference with respect to a first circulation signal circulating in the first gated ring oscillator. The digital converter unit samples output signals of the first delay cells and the second delay cells to output a digital value corresponding to duration of the enable signal.
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