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. Author manuscript; available in PMC: 2019 Nov 25.
Published in final edited form as: J Neural Eng. 2019 Oct 9;16(6):066003. doi: 10.1088/1741-2552/ab2610

Figure 2.

Figure 2

Graphical representation of the four blocks constituting the AFE architecture. The resistors and capacitors included in these blocks are characterized by a tolerance of 0.1% and 10%, respectively. (a) The signals coming from two contacts of the DBS electrode are subtracted and amplified with a gain of 40 dB by an INA with high-pass characteristics (the high-pass knee frequency was set at 0.5 Hz). (b) An eight-pole Bainter 140 Hz notch filter is used to suppress the main frequency of the stimulation artefacts. (c) A two-pole 500 Hz Sallen-Key low-pass filter is used to suppress the high-frequency harmonics of the stimulation artefacts and define the passband of the system. (d) An INA provides either 20 dB or 40 dB amplification, which is digitally determined via a multiplexer.