Low Power Active Electrode ICs for Wearable EEG Acquisition by Jiawei Xu Refet Firat Yazicioglu Chris Van Hoof & Kofi Makinwa

Author:Jiawei Xu, Refet Firat Yazicioglu, Chris Van Hoof & Kofi Makinwa
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

(4.4)

Electrode Offset Rejection

To reject a large DC electrode offset (DEO), which may otherwise saturate the AE, the built-in IA implements a continuous-time DSL (Fig. 4.5). The DSL stabilizes the output DC voltage to a reference voltage (V ref) via an active RC integrator, which feeds the IA’s output offset back to its inverting input via a large pseudo resistor (R s). The maximum electrode offset rejection of each AE is ±250 mV with respect to the subject bias. This is ultimately determined by the input biasing range of the core amplifier.

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