Time to digital converter (TDC) circuit with self-adaptive time granularity and related methods
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United States of America
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Feb 4, 2025
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Nov 30, 2023
app pub date -
May 31, 2022
filing date -
May 31, 2022
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Abstract
A time-to-digital converter (TDC) circuit generates a digital output indicating a time, known as a phase difference, from a phase of the generated signal to a corresponding phase of a reference signal. The digital output is used by the digitally controlled oscillator (DCO) to correct for the phase/frequency difference to synchronize the generated signal with the reference signal. In an aspect, an adaptive TDC circuit generates a first digital indication in a coarse mode when the offset time is above a threshold and generates a second digital indication in a fine mode when the offset time is below the threshold. The first digital indication and the second digital indication each comprise a same number of bits, and the first digital indication is normalized to the second digital indication for the digital output of the adaptive TDC circuit. A fractional bit may be employed to compensate for a quantization error.
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