Performance of the electronics for the liquid argon calorimeter system of the SLC large detector

Results of performance tests on electronics for the liquid argon calorimeter (LAC) for the SLD (Stanford Linear Collider Large Detector) experiment are presented. The behavior of a subunit called a tophat, which processes 720 detector signals is described. The electronics consists of charge-sensitive preamplifiers, analog memories, A/D (analog/digital) converters, and associated control and readout circuitry. An internal charge-injection system is used to calibrate the overall response of the devices. Linearity is better than 1% for 0-28-pC charge at the input of the amplifiers. Noise (expressed as equivalent input charge) is less than 3000 electrons at a shaping time of 4 μs, with a slope of 2600 e^-/nF. Crosstalk to adjacent channels is less than 0.5%. The power consumption at a duty cycle of 13% is 61 W