ASIC design and data communications for the Boston retinal prosthesis.
ASIC design and data communications for the Boston retinal prosthesis.
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DOI：
10.1109/embc.2012.6345927
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
Rizzo JF
中科院分区：
文献类型：
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作者：
Shire DB;Ellersick W;Kelly SK;Doyle P;Priplata A;Drohan W;Mendoza O;Gingerich M;McKee B;Wyatt JL;Rizzo JF
我们报告的设计和测试的定制专用集成电路（ASIC），已开发的波士顿视网膜假体的关键组成部分。该设备专为因年龄相关性黄斑变性或视网膜色素变性而失明的患者设计。描述了低功耗ASIC的关键安全和通信功能，以及输送到其大于256个输出电极的高度可配置的神经刺激电流波形。ASIC是使用0.18微米Si制造工艺制造的，该工艺利用标准1.8伏CMOS晶体管以及20伏轻掺杂漏极FET。通信系统从植入的次级线圈接收6.78 MHz的频移键控输入，并通过采用负载移位键控的低带宽通道将数据传输回控制单元。通过板载电极电压监测、刺激电荷限制、传输到植入体的数据的错误检查以及全面的自检和性能监测功能，确保了设计的安全性。每个激励周期由一个带有完整32位错误校验码的传输字启动。总之，这些功能使研究人员能够安全和无线地为每位患者定制视网膜刺激和视力恢复。
We report on the design and testing of a custom application-specific integrated circuit (ASIC) that has been developed as a key component of the Boston retinal prosthesis. This device has been designed for patients who are blind due to age-related macular degeneration or retinitis pigmentosa. Key safety and communication features of the low-power ASIC are described, as are the highly configurable neural stimulation current waveforms that are delivered to its greater than 256 output electrodes. The ASIC was created using an 0.18 micron Si fabrication process utilizing standard 1.8 volt CMOS transistors as well as 20 volt lightly doped drain FETs. The communication system receives frequency-shift keyed inputs at 6.78 MHz from an implanted secondary coil, and transmits data back to the control unit through a lower-bandwidth channel that employs load-shift keying. The design’s safety is ensured by on-board electrode voltage monitoring, stimulus charge limits, error checking of data transmitted to the implant, and comprehensive self-test and performance monitoring features. Each stimulus cycle is initiated by a transmitted word with a full 32-bit error check code. Taken together, these features allow researchers to safely and wirelessly tailor retinal stimulation and vision recovery for each patient.