Camera trigger logic - AnalogSum

The simulation of the trigger logic for the analog sum trigger is defined as follows:

1. An (optional) shaping of the input signal is applied using a shaper signal defined in .

2. An (optional) time offset, , used in the convoluted signal of the “discriminator input” signal \(\times\) the (effectively a convolution kernel).

3. If necessary, the analog signal in each pixel is clipped (clipping threshold defined by ).

4. The analog signals from clusters of adjacent trigger modules are summed. The clusters and modules are defined in the . A trigger module is composed of seven pixels and a trigger cluster consists of three modules, 21 pixels in total. One module can be part of a few trigger clusters, such that the clusters overlap.

5. The trigger fires if the sum over all pixels in a trigger cluster is higher than a predefined value, .