64CH MRI Compatible EEG Module

This project involved the development of a 64 channel EEG acquisition module designed for use on patients inside an MRI system, where signal integrity, electromagnetic compatibility, and patient safety are all critical. The architecture is built around two 32 channel acquisition paths, creating a full 64 channel system with 16 bit resolution and sampling rates up to 30 kSPS per input. Each analog front end supports digitally programmable upper and lower cutoff frequencies, enabling flexible adaptation across different acquisition conditions while maintaining a controlled and repeatable signal chain. The design also supports in situ electrode impedance measurement and digital high pass filtering for amplifier offset removal, extending the system beyond simple data capture into a more complete electrophysiology platform. Signal transport was treated as a system level problem rather than a board level afterthought. Channel data is serialized into a high speed stream, converted through serializer and deserializer stages, and transferred over optical fiber to maintain robust isolation and reliable transmission in the MRI environment. The schematics also show a dedicated fiber optic transmit and receive section and matched serializer and deserializer devices forming the backbone of the external data path. The platform also integrates two wireless sections, each handling 32 channels of data, enabling segmented Bluetooth streaming alongside the primary acquisition architecture. This dual path approach reflects careful partitioning of bandwidth, synchronization, and system control across the full 64 channel design. The top level and wireless subsystem pages show the split architecture and independent control interfaces for the paired channel groups. Because the device is intended to operate inside MRI conditions, component and layout strategy were shaped by electromagnetic constraints from the start. Air core inductors, careful handling of copper pours, and deliberate mixed signal partitioning were essential to reducing magnetic interaction and preserving low noise performance. This is the kind of project where analog precision, digital transport, and environmental compatibility all have to work together without compromise. The result is a high channel count EEG module that combines precision biosignal acquisition, configurable filtering, impedance measurement, optical isolation, and wireless telemetry in a platform designed for one of the most demanding operating environments in medical electronics.