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We report the design and characterisation of a 32times32 time to digital (TDC) converter plus single photon avalanche diode (SPAD) pixel array implemented in a 130 nm imaging process. Based on a gated ring oscillator approach, the 10 bit, 50 mum pitch TDC array exhibits a minimum time resolution of 50 ps, with accuracy of plusmn0.5 LSB DNL and 2.4 LSB INL. Process, voltage and temperature compensation...
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