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A low-power CMOS time-to-digital converter

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3 Author(s)
E. Raisanen-Ruotsalainen ; Dept. of Electr. Eng., Oulu Univ., Finland ; T. Rahkonen ; J. Kostamovaara

A time-to-digital converter, TDC, with 780 ps lsb and 10-μs input range has been integrated in a 1.2-μm CMOS technology. The circuit is based on the interpolation time interval measurement principle and contains an amplitude regulated crystal oscillator, a counter, two pulse-shrinking delay lines, and a delay-locked loop for stabilization of the delay. The TDC is designed for a portable, low-power laser range-finding device. The supply voltage is 5±0.5 V, and the operating temperature range is -40 to +60°C. Single-shot accuracy is 3 ns and accuracy after averaging is ±120 ps with input time intervals 5-500 ns. In the total input range of 10 μs, the final accuracy after averaging is ±200 ps. Current consumption is 3 mA, and the chip size is 2.9 mm×2.5 mm

Published in:

IEEE Journal of Solid-State Circuits  (Volume:30 ,  Issue: 9 )