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The Cherenkov Telescope Array (CTA) project aims to build the largestground-based gamma-ray observatory based on an array of Imaging AtmosphericCherenkov Telescopes (IACTs). The CTA will implement a multi-level triggersystem to distinguish between gamma ray-like induced showers and backgroundimages induced by night sky background (NSB) light. The trigger system is basedon coincident detections among pixels (level 0 trigger), clusters of pixels(level 1) or telescopes. In this article, the first version of the applicationspecific integrated circuit (ASIC) for Level 1 trigger system is presented,capable of working with different Level 0 strategies and different triggerregion sizes. In addition, it complies with all the requirements specified bythe CTA project, specially the most critical ones as regards noise, bandwidth,dynamic range and power consumption. All these features make the presentedsystem very suitable for use in the CTA cameras and improve the features ofdiscrete components prototypes of the L1 trigger circuit in terms ofcompactness, noise, performance and power consumption.

Analogue Sum ASIC for L1 Trigger Decision in Cherenkov Telescope Cameras