We present a neural interface IC for high-precision optical stimulation and electrical recording from implanted optoelectrodes with the highest system integration to date. The system combines 12 high-resolution constant-current LED driver channels, 32 recording channels, and an efficient PMU for operation from a low voltage Li battery on a wireless platform. A novel LED driver architecture features a high-efficiency wide-current-range fully-integrated voltage regulator and a high-resolution pulse shaper to minimize recording artifacts from sharp current pulse edges. A prototype, fabricated in 0.18μm CMOS, occupies 7.35mm2. The LED driver has a peak efficiency of 50% and consumes 31μW quiescent power. We demonstrate in-vivo that the pulse-shaping scheme prevents stimulation artifacts. Key Words: neural interface, LED driver, optogenetics.
|Title of host publication||2018 IEEE Symposium on VLSI Circuits, VLSI Circuits 2018|
|Publisher||Institute of Electrical and Electronics Engineers Inc.|
|Number of pages||2|
|Publication status||Published - 2018 Oct 22|
|Event||32nd IEEE Symposium on VLSI Circuits, VLSI Circuits 2018 - Honolulu, United States|
Duration: 2018 Jun 18 → 2018 Jun 22
|Name||IEEE Symposium on VLSI Circuits, Digest of Technical Papers|
|Other||32nd IEEE Symposium on VLSI Circuits, VLSI Circuits 2018|
|Period||18/6/18 → 18/6/22|
Bibliographical notePublisher Copyright:
© 2018 IEEE.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Electrical and Electronic Engineering