An integrated receiver-TDC (time-to-digital converter) chip set is developed for pulsed time-of-flight (TOF) laser rangefinding. The receiver detects the current pulse from the optical detector and produces a timing mark for the TDC. The receiver uses time mode walk error compensation scheme achieving <+/-2.5 mm residual timing walk error within a dynamic range of ~1:40,000. The multi-channel TDC measures the time position, width and rise time of the echo pulses simultaneously with ~ 10 picosecond (ps) precision. Both chips are manufactured in 0.35-µm complementary metal-oxide semiconductor (CMOS) technology. The functionality of the chip set was demonstrated in a laser radar platform using 12 W and 3-ns optical pulses produced by a laser diode. A measurement accuracy of ~+/-3 mm was achieved with non-cooperative targets at a distance range of a few tens of metres within an amplitude range of received echoes of 1:40,000.
Kurtti Sami, Jansson Jussi-Pekka, Kostamovaara Juha
A1 Journal article – refereed
Place of publication:
S. Kurtti, J. Jansson and J. Kostamovaara, “A CMOS Receiver–TDC Chip Set for Accurate Pulsed TOF Laser Ranging,” in IEEE Transactions on Instrumentation and Measurement, vol. 69, no. 5, pp. 2208-2217, May 2020. doi: 10.1109/TIM.2019.2918372
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