We describe an implantable electroneurogram (ENG) amplifier dedicated to incontinence and other functional electrical stimulation applications. The amplifier features a novel simple passive technique for removing myoelectric (EMG) interference in neural recording systems using tripolar cuff electrodes. The system blocks of the front- end (instrumentation amplifier, post-filter, rectifier and programmable gain block) are described. The amplifier was fabricated in a 3-V 0.35-mum BiCMOS process technology and preliminary measured results are presented. Input signals aslow as 1 muV can be reliably detected.
['Andreas Demosthenous', 'Ioannis Pachnis', 'Mohamad Rahal', 'Dai Jiang', 'Nick Donaldson']
An ENG Amplifier with Passive EMG Neutralization