A fine-resolution pulse-shrinking time-to-digital converter with completion detection utilizing built-in offset pulse

This paper proposes a fine-time-resolution pulse-shrinking (PS) time-to-digital converter (TDC) based on an offset pulse width detection scheme. The proposed PS TDC detects the end of the conversion utilizing a built-in offset pulse unlike the conventional PS TDCs. Thus it prevents an undesirable non-uniform shrinking rate issue in the conventional ones and contributes to fine-resolution, small-area, power-efficient and low-jitter implementation. The prototype TDC fabricated in a 0.18μm standard CMOS technology realizes 9 bit, 1.8 ps sub-gate-delay resolution with 0.07 mm
²
area, and achieves 2.16 ps single-shot precision. Its power dissipation is 3.4 mW at 4.4 MS/s.