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In this paper, we propose and evaluate a method of generating low-cost devicesignatures for distributed wireless brain implants, using a Pseudo-RandomBinary Sequence (PRBS) Generator that utilizes a modified Ring-Oscillator-basedPhysical Unclonable Function (RO-PUF). The modified RO-PUF's output is used asa seed for the PRBS generator, which creates a multi-bit output that can bemapped to a time-slot when the implant is allowed to communicate with theexternal world using duty-cycled time-division multiplexing. A 9-bit PRBSgenerator is shown in hardware (with a TSMC 65 nm test chip implementation)that demonstrates < 100 nW Power consumption in measurement (72% lower powerand 78% lower area than a traditional 9-bit RO-PUF implementation), whichsupports 26 implants with the probability of time-slot collision being < 50%.This potentially creates a pathway for low-cost device signature generation forhighly resource-constrained scenarios such as wireless, distributed neuralimplants.

Modified Ring-Oscillator Physical Unclonable Function (RO-PUF) based PRBS Generation as a Device Signature in Distributed Brain Implants