Speaker
Description
A new CMOS integrated front-end has been developed to use in Time Projection Chamber (TPC) based experiments. The readout of large-scale detectors involves some intrinsic challenges. Nowadays, most of these experiments choose Silicon Photomultipliers (SiPMs) as sensors. However, there is a large variety of sizes and gains, which turns into different parasitic capacitance and dark count rates. Moreover, large detection areas with high coverage are needed, resulting in a high dynamic range of photoelectrons (PE). Additionally, short time integration windows are required in order to obtain better topological information. However, this constraint reduces the charge integrated by each SiPM, thus decreasing signal to dark count ratio. Beyond these issues, the system must be able to process arbitrary shape signals and ensure a single-photon sensitivity for calibration purposes. Finally, the large detector scale implies a high number of channels, which generates a massive amount of data to be managed.
To overcome the presented problems, TRISK-J implements a two path channel architecture that fits NEXT experiment requirements. The ASIC integrates a configurable preamplifier to handle sensor capacitances. This module feeds a slow path for charge integration, and a fast path for data rate optimization. Slow path implements a wide range integrator followed by an asynchronous Analog to Digital converter (ADC). Fast path includes a fully-analog statistical estimator that helps discarding windows without true signal content. Finally, a high speed digital interface is used to send data to the external acquisition system.
| Minioral | Yes |
|---|---|
| IEEE Member | No |
| Are you a student? | No |