©Front-end electronics for multi-gap RPC: comparison of timing compensations using slew rate, peak value, charge amount and signal width

Triggering by threshold level for time measurement is inherently subject to problems of time walk. In this paper, we discuss timing compensation methods, in order to minimize the effect of time walk, using slew rate, peak value, charge amount and width of signal in the front-end electronics for a multi-gap resistive plate chamber (MRPC). In order to perform these timing compensations, the front-end electronics contains a preamplifier, 4 time-to-digital converters (TDC), a peak detector, a charge integrator and interface circuitry for control and data transfer to a computer. We make performance test of the front-end electronics with simulated signal in the laboratory and correct arrival times with measured data. Timing compensation using charge amounts has small standard deviation. A irrelevantly to threshold levels. Timing compensation using slew rate is preferred for the large difference of threshold levels and timing compensation using signal width at the high threshold level