An integrated 9-channel parallel time-to-digital converter circuit has been designed for a 3D imaging laser range-finding application. The measured single-shot resolution /spl sigma/-value is 312 ps (4.7 cm) or better in the whole 960 ns (144 m) measurement range. With time interval averaging resolution better than 1 ps /spl sigma/-value (0.15 mm) was measured in one channel without interference. The maximum measured interchannel interference is /spl plusmn/20 ps (/spl plusmn/3 mm). The circuit was fabricated in an 0.8 /spl mu/m CMOS process and it consumes 25 mA from a single 5 V supply.
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Mantyniemi et al. (2002) studied this question.