**6. Conclusions**

This review paper presents and discusses the major blocks of the signal recording and seizure detection of an implantable system aiming at epilepsy control. While classical techniques pertaining to analog and digital circuit design are used, the paper focuses on specificities related to neural signal recording in multichannel systems. Epileptic signals are discussed from an engineering perspective, i.e., summarizing the major electrical characteristics and their impact on the microelectronics front-ends. The commercial implantable systems aiming at epilepsy control which command over an official approval at the moment of writing are reviewed. External systems which represent non-invasive systems are presented as a new trend in seizure alarming.

Circuit and system techniques are presented that aim at solving contemporary issues related to low-power, low-noise and low-area trade-offs met in modern microelectronics multi-channel neural acquisition systems. Specifically, the amplifier-sharing technique, as well as the compressed sensing technique, are discussed and presented.

**Author Contributions:** Conceptualization, R.R. and A.S.; circuits design and validation, original draft preparation, R.R.; review and editing, supervision, funding acquisition, A.S. All authors have read and agreed to the published version of the manuscript.

**Funding:** This research was supported by the SNSF under gran<sup>t</sup> No. 200020-175790.

**Conflicts of Interest:** The authors declare no conflict of interest.
