Shingo Mandai

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— This paper proposes a 128-channel column-parallel two-stage time-to-digital converter (TDC) utilizing a time difference amplifier (TDA) and shows measurement results with a 0.35um CMOS process. The 1st stage operates as a coarse TDC, the time residue which is not converted in the 1st stage is amplified by a TDA, then converted by the 2nd stage TDC. As the(More)
We introduce a 4<sup>2</sup>x cascaded time difference amplifier (TDA) using differencial logic delay cells with 0.18&mu;m CMOS process. By employing differential logic cells for the delay chain instead of CMOS logic cells, our TDA has stable time difference gain (TD gain) and fine time resolution. Measurement results show that our TDA achieves less than(More)
—This paper proposes a 128-channel column-parallel two-stage time-to-digital converter (TDC) utilizing a time difference amplifier (TDA) and shows measurement results obtained from an implementation in a 0.35-m CMOS process. The first stage operates as a coarse TDC, the time residue is amplified by a TDA, then converted by the second-stage TDC. As the gain(More)
— This paper presents a digital silicon photomultiplier based on column-parallel time-to-digital converter (TDC), so as to improve the time resolution of single-photon detection. By reducing the number of pixels per TDC, the pixel-to-pixel skew is reduced. We achieved 264 ps FWHM time resolution of single-photon detection using a 48-fold column-parallel TDC(More)
We present a 4 × 4 array of digital silicon photomultipliers (D-SiPMs) capable of timestamping up to 48 photons per D-SiPM and we show the advantage of generating multiple timestamps in the context of positron emission tomography (PET). The D-SiPMs have a pitch of 800 µm and comprise 416 pixels each; the timing resolution achieved by the SiPMs is 179 ps(More)
This paper presents a digitally controlled charge pump (DCP) to supply high voltages, while ensuring temperature and load current independence of excess bias in cameras based on avalanche photodiodes. This is achieved through a single-photon avalanche diode (SPAD) based monitoring mechanism that continuously reconfigures the DCP using a feedback loop to(More)