In neuromodulation applications, conventional current mode stimulation is often preferred over its voltage mode equivalent due to its good control of the injected charge. However, it comes at the cost of less energy-efficient output stages. To increase energy efficiency, recent studies have explored non-rectangular stimuli. The current work highlights the importance of an adaptive supply for an output stage with programmable non-rectangular stimuli and accordingly proposes a system-level architecture for multi-channel stimulators. In the proposed architecture, a multi-output DC/DC Converter (DDC) allows each channel to choose among the available supply levels (i.e., DDC outputs) independently and based on its instant voltage/current requirement. A system-level analysis is carried out in Matlab to calculate the possible energy savings of this solution, compared to the conventional approach with a fixed supply. The energy savings have been simulated for a variety of supply levels and waveform amplitudes, suggesting energy savings of up to 83% when employing 6 DDC outputs and the lowest current amplitude explored (250A), and as high as 26% for a full-scale amplitude (4 mA).
|Title of host publication||44th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBC 2022|
|Number of pages||4|
|Publication status||Published - 2022|
|Event||2022 44th Annual International Conference of the IEEE Engineering in Medicine & Biology Society (EMBC) - Glasgow, United Kingdom|
Duration: 11 Jul 2022 → 15 Jul 2022
Conference number: 44th
|Name||Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS|
|Conference||2022 44th Annual International Conference of the IEEE Engineering in Medicine & Biology Society (EMBC)|
|Period||11/07/22 → 15/07/22|
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