The Low Power Giga Bit Transceiver (lpGBT) is a radiation-tolerant ASIC that can be used to implement multipurpose high speed bidirectional optical links for high-energy physics experiments. The ASIC supports 2.56 Gb/s links in the direction from the counting room to the detectors (downlink) and 5.12 or 10.24 Gb/s links in the direction from the detectors to the counting room (uplink), depending on the selected mode of operation. Logically, the link provides three “distinct” data paths for Timing and Trigger Control (TTC), Data Acquisition (DAQ) and Slow Control (SC) information. Depending on the mode of operation,
the lpGBT features up to 28 uplink elinks and 16 downlink elinks supporting data rates between 80 Mb/s and 1.28 Gb/s per link. Additionally, 32 programmable clock outputs with frequencies between 40 MHz and 1.28 GHz can be provided to downstream systems. Designed with radiation tolerance in mind, the chip was tested for TID exceeding 200 Mrad and experimentally characterized for SEEs with heavy ions up to an LET of 63 MeV.cm²/mg.
This talk will focus on the techniques adopted to achieve a radiation-tolerant ASIC compatible with the requirements of the upcoming HL-LHC upgrade. A summary of the mitigations against SEE in analog and digital blocks will be presented along with a description of the SEE simulations performed before tapeout. Results from characterization, SEE and TID qualification will be presented which will corroborate the usefulness of the adopted design and verification techniques.
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