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T: Fachverband Teilchenphysik

T 43: Electronics, DAQ, Exp. Methods

T 43.1: Vortrag

Dienstag, 21. März 2023, 17:00–17:15, POT/0106

Turning an FPGA into a fast multi-channel ADC — •Dmitry Eliseev, Thomas Hebbeker, Markus Merschmeyer, Carsten Presser, and Erik Ehlert — III. Physikalisches Institut A, RWTH Aachen University, Germany

Electronics for particle detectors nowadays typically deal with a huge number of channels. In a typical detector read-out electronics, the front-end signals are passed through a multi-channel conditioning circuit and meet an FPGA chip at the other end. Modern FPGAs enable good time resolution for such multi-channel acquisition. However, the common solution remains to acquire information on the energy or amplitude of particular events using high-speed multi-channel ADCs. Using ADCs often results in more complex schematics and much higher costs of the electronics for signal acquisition. The presented method makes it possible to waive the ADCs and, to some extent, replace the ADC's functionality with FPGA's internal resources. The method requires a minimal number of additional low-cost external components and can be potentially interesting for many detector applications.

The talk provides a general overview of how to turn a commercially available FPGA device into a multi-channel high-speed ADC. Characterization measurements and calibration methods for the resulting FPGA-based ADC are also given. Possible technical difficulties and ways to overcome them are discussed in an example application: an 8-channel mezzanine PCB for signal acquisition from multiple SiPMs.