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The water Cherenkov detector array (WCDA) is one of the key detectors in thelarge high altitude air shower observatory (LHAASO), which is proposed for veryhigh gamma ray source survey. In WCDA, there are more than 3000 photomultipliertubes (PMTs) scattered under water in an area of 80000 m2. As for the WCDAreadout electronics, both high precision time and charge measurement isrequired over a large dynamic range from 1 photon electron (P.E.) to 4000 P.E.To reduce the electronics complexity and improve the system reliability, areadout scheme based on application specific integrated circuits (ASICs) isproposed. Two prototype ASICs were designed and tested. The first ASICintegrates amplification and shaping circuits for charge measurement anddiscrimination circuits used for time measurement. The shaped signal is furtherfed to the second ADC ASIC, while the output signal from the discriminator isdigitized by the FPGA-based time-to-digital converter (TDC). Test resultsindicate that time resolution is better than 250 ps RMS, and the chargeresolution is better than 10% at 1 P.E., and 1% at 4000 P.E. which meets therequirements of the LHAASO WCDA.

Testing of Front-End Readout Prototype ASICs Designed for WCDA in LHAASO