TRISH - a Triggerless Random Interleaved Sampling Hardware

We present a sampling hardware that can be used as a demonstration system for the triggerless random interleaved sampling method. The hardware is capable of acquiring sample-trains of lengths 2, 3 and 4 with a programmable inter-sample distance. Each sample-train consists of samples which originate from separate ADC channels. The whole system is supervised by a single board computer, Raspberry Pi, which also forms a communication interface for the system. The paper proposes a calibration method, which allows for reduction of the interchannel vo ltage offsets, equalization of the voltage gains in the individual ADC channels, as well as equalization of the inter-sample time distances.