Stimulation driver circuits for non rectangular stimuli in biomedical implants

Abstract

This work explores the non rectangular (specifically triangular and Gaussian) shaped stimulator current pulse generation schemes and their associated charge balance performance. The preference to power and charge efficient non rectangular stimuli has been well established in literature. But the existing stimulation drivers cannot be used to deliver non rectangular stimuli motivating the need for a new driver for non rectangular stimuli. The challenge in incorporating this functionality is to arrive at a simple architecture of the stimulation driver which can faithfully reproduce various current wave shapes for different levels under varying load conditions.