TIME-TO-DIGITAL CONVERTERS (TDC) EMPLOYING A SINGLE-STAGE DELAY PAIR AND NOISE SHAPING FOR WIDE INPUT RANGE AND REDUCED QUANTIZATION NOISE IN A PHASE-LOCKED LOOP (PLL)
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United States of America
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Oct 31, 2024
app pub date -
Apr 28, 2023
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Apr 28, 2023
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Abstract
Time-to-digital converters (TDC) employing a single-stage delay pair for a wide input range and reduced quantization noise in a phase-locked loop (PLL) and related fabrication methods are disclosed. Aspects disclosed in the detailed description include a single-stage Vernier time-to-digital converter (TDC) which mitigates the device mismatch impact and therefore avoids possible spurious tones in a fractional-N PLL application. Combined with a delta-sigma noise shaping stage and a ring-oscillator based coarse TDC, the invention achieves a good trade-off between resolution, detection range and PLL locking speed.
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