Attention Makers


neural stimulator

MAKERS: zyad , Ahmed COUNTRY: Egypt

the electrical stimulations have been widely used for biomedical applications, such as cardiac pacemaker, cochlear implant, muscle exercising, vision restoration, and seizure suppression.


The Purpose

Our project is to design on-chip electrical stimulator that comprises between linearity, and power efficiency, while maintaining the minimum power consumption. Following that, the on-chip stimulator will be fabricated using UMC 130nm CMOS technology and tested

The Technology

The first design aims to implement a multiple-waveform current stimulator circuit that integrates the adaptive generation of the three most popular stimulation waveforms (rising exponential, falling exponential and rectangular). Switching technique is used to merge repeated blocks to reduce static power consumption, reject charge accumulation and increase efficiency. The stimulation amplitude range can be varied from 0 to 2mA in a manner that each range can be divided into 16 steps by a 4 bit binary weighted digital to analog converter (DAC). The simulated power consumption of the proposed stimulator for one channel is 23.2 uW and the maximum achieved

Additional Details

While the second design is a high-voltage-tolerant stimulator with adaptive loading in a standard process, in order to avoid the use of high-voltage transistors. The proposed stimulator consists of a high-voltage generator (charge pump), a pair of high-voltage-tolerant output drivers, and a pair of current controllers, the stimulator has been designed to deliver biphasic stimulus currents with H-bridge topology. The biphasic stimulus pattern a constant 30uA current. With average power consumption 1.756 mW. And with lower charge pump clock frequency 10 times than previous work in this field, which will result in a better power efficiency. Finally, smaller area is

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