Abstract:We present the detailed study of the digital readout of Topmetal-II -CMOS pixel direct charge sensor. Topmetal-IIis an integrated sensor with an array of 72 × 72 pixels each capable of directly collecting external charge through exposed metal electrodes in the topmost metal layer. In addition to the time-shared multiplexing readout of the analog output from Charge Sensitive Amplifiers in each pixel, hits are also generated through comparators with individually DAC settable thresholds in each pixel. The hits ar… Show more
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