Method of designing a multi-channel micro-electrical stimulation with an equivalent current source that works with an adiabatic baseband based on direct-carrier energy extraction

摘要

A method of designing a multi-channel micro-electrical stimulation structure with an equivalent current source that works with an adiabatic baseband based on direct-carrier energy extraction matches with a baseband circuitry designed for energy recovery with the equivalent current source. A controllable pulse width modulation signal at the operating rate near to the carrier rate is used to implement the charge accumulation for the stimulation resolution on the time sequence axis. The design of equivalent current source may reduce the defects caused by a general D/A converter for full-scale stimulation resolution. Further, the adiabatic design is applied, so the redundant power consumption caused at the higher clock rate is minimized and, due to the switching current in the baseband circuitry significantly decreasing, only one voltage regulator circuit is required for the operation of analog and digital circuits that is imbedded into a chip, thereby more design cost being reduced.