Low-gain, low-noise integrated neuronal amplifier for implantable artifact-reduction recording system Article

Zbrzeski, A, Lewis, N, Rummens, F et al. (2013). Low-gain, low-noise integrated neuronal amplifier for implantable artifact-reduction recording system . 3(3), 279-299. 10.3390/jlpea3030279

cited authors

  • Zbrzeski, A; Lewis, N; Rummens, F; Jung, R; N'Kaoua, G; Benazzouz, A; Renaud, S

authors

abstract

  • Brain neuroprostheses for neuromodulation are being designed to monitor the neural activity of the brain in the vicinity of the region being stimulated using a single macro-electrode. Using a single macro-electrode, recent neuromodulation studies show that recording systems with a low gain neuronal amplifier and successive amplifier stages can reduce or reject stimulation artifacts. These systems were made with off-the-shelf components that are not amendable for future implant design. A low-gain, low-noise integrated neuronal amplifier (NA) with the capability of recording local field potentials (LFP) and spike activity is presented. In vitro and in vivo characterizations of the tissue/electrode interface, with equivalent impedance as an electrical model for recording in the LFP band using macro-electrodes for rodents, contribute to the NA design constraints. The NA occupies 0.15 mm2 and dissipates 6.73 μW, and was fabricated using a 0.35 μm CMOS process. Test-bench validation indicates that the NA provides a mid-band gain of 20 dB and achieves a low input-referred noise of 4 μVRMS. Ability of the NA to perform spike recording in test-bench experiments is presented. Additionally, an awake and freely moving rodent setup was used to illustrate the integrated NA ability to record LFPs, paving the pathway for future implantable systems for neuromodulation. © 2013 by the authors; licensee MDPI, Basel, Switzerland.

publication date

  • September 9, 2013

Digital Object Identifier (DOI)

start page

  • 279

end page

  • 299

volume

  • 3

issue

  • 3