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A new application-specific integrated circuit (ASIC), the high-speedcharge-to-time converter (QTC) IWATSU CLC101, provides three channels, eachconsisting of preamplifier, discriminator, low-pass filter, and chargeintegration circuitry, optimized for the waveform of a photomultiplier tube(PMT). This ASIC detects PMT signals using individual built-in discriminatorsand drives output timing signals whose width represents the integrated chargeof the PMT signal. Combined with external input circuits composed of passiveelements, the QTC provides full analog signal processing for the detector'sPMTs, ready for further processing by time-to-digital converters (TDCs).High-rate (>1MHz) signal processing is achieved by short-charge-conversion-timeand baseline-restoration circuits. Wide-range charge measurements are enabledby offering three gain ranges while maintaining a short cycle time. QTC chiptest results show good analog performance, with efficient detection for asingle photoelectron signal, four orders of magnitude dynamic range (0:3mV ~3V; 0:2 ~ 2500 pC), 1% charge linearity, 0.2 pC charge resolution, and 0.1 nstiming resolution. Test results on ambient temperature dependence, channelisolation, and rate dependence also meet specifications.

High-speed charge-to-time converter ASIC for the Super-Kamiokande detector