Title

An Energy-Efficient Wide-Supply-Range Stimulation System in Standard CMOS Process

DGIST Authors

Jeongyoon Wie ; Junghyup Lee ; Gain Kim

Advisor

이정협

Co-Advisor(s)

Gain Kim

Issued Date

2023

Awarded Date

2023-02-01

Citation

Jeongyoon Wie. (2023). An Energy-Efficient Wide-Supply-Range Stimulation System in Standard CMOS Process. doi: 10.22677/THESIS.200000656806

Type

Thesis

Description

Nerual stimulator

Table Of Contents

I. Introduction 1
1.1 Neuromodulation 1
1.2 Biologics of Action Potential 2
II. Design Consideration 4
2.1 Advanced Closed-Loop Stimulation System 4
2.1.1 Wide voltage compliance with electrode-electrolyte impedance 4
2.1.2 Recorder and stimulator interface 5
2.2 Implantation Risk Reduction 7
2.2.1 Stimulation Method 7
2.2.2 Bi-phasic stimulus with H-bridge structure 8
2.2.2 Passive charge balancer 9
2.3 Energy Efficiency 10
2.3.1 Impedance-adaption: supply voltage variation robustness 10
2.3.2 Interphase delay and arbitrary waveform 11
2.4 Design Consideration Conclusion 12
III. Design of Neural Stimulator 13
3.1 Overall Architecture of the Proposed Neural Stimulator 13
3.2 Digital Block 14
3.3 Current DACs 16
3.4 Current Driver for Higher Compliance Voltage 17
3.4.1 Conventional H-bridge current driver 17
3.4.2 Proposed H-bridge current driver 19
3.5 Current Driver Controller 20
3.5.1 Calculation of switch turn-on voltage 20
3.5.2 Conventional level shifter 21
3.5.3 Proposed high voltage level shifter for PMOS switching 22
3.6 Charge Balancer: Implantation Risk Reduction 23
3.7 System Complexity Reduction 24
3.7.1 Drop-voltage reference and HV analog buffer 24
IV. Simulation Results 27
4.1 Drop-Voltage Reference: PVT Robustness 27
4.2 High Voltage Analog Buffer 28
V. Measurement of Neural Stimulator 29
VI. Conclusion 34
VII. Reference 35

URI

http://hdl.handle.net/20.500.11750/45758
http://dgist.dcollection.net/common/orgView/200000656806

DOI

10.22677/THESIS.200000656806

Degree

Master

Department

Department of Electrical Engineering and Computer Science

Publisher

DGIST

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