In this paper a new way to combine timing discrimination and time interval measurement in pulsed laser rangefinding is presented. The aim is to eliminate the dependency of amplitude from the timing result, i.e. walk error. The idea is based on atime-to-amplitude converter where the input transistors are used as“soft switches" by controlling them with an analog input signal. 'The principle of the operation has been presented together with measurement results of a test circuit implemented in a0.8 μm BiCMOS process. A measured walk error of f±3.5 ps has been achieved with the input signal dynamic range of 1:l9.
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