A CMOS chip set for accurate pulsed time-of-flight laser range finding
Kurtti, S.; Nissinen, J.; Jansson, J.-P.; Kostamovaara, J. (2018-07-12)
S. Kurtti, J. Nissinen, J. -. Jansson and J. Kostamovaara, "A CMOS chip set for accurate pulsed time-of-flight laser range finding," 2018 IEEE International Instrumentation and Measurement Technology Conference (I2MTC), Houston, TX, 2018, pp. 1-5. doi: 10.1109/I2MTC.2018.8409646
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A laser rangefinder device based on pulsed time-of-flight (TOF) distance measurement techniques was constructed and tested. Key blocks of the system are the integrated receiver channel and the integrated time-to-digital converter (TDC) fabricated in a 0.35-um CMOS technology. The receiver-TDC chip set is capable of measuring the time position, rise time and pulse width of incoming optical pulses with ps precision in the amplitude range of more than 1: 50 000. The timing detection is based on leading edge detection in the receiver channel, and the amplitude-dependent timing error is compensated for by utilizing the multichannel TDC. A measurement distance of 100 m is achieved to a target with a reflectance of about 10% at the signal level of SNR = 6, with an optical output power and receiver aperture of 12 W and 18 mm, respectively.
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