Authors:
Vijith Vijayakumaran Nair
;
Jinhwan Youn
and
Jun Rim Choi
Affiliation:
Kyungpook National University, Korea, Republic of
Keyword(s):
Biomedical Implant, Power Recovery, High Voltage Integrated Chip, Cuff-Nerve Electrode Interface, Power
Efficiency, Rectifier, Linear Voltage Regulator, Charging Control Circuit.
Related
Ontology
Subjects/Areas/Topics:
Biocomputing and Biochips
;
Biomedical Engineering
;
Biomedical Instruments and Devices
;
Implantable Electronics
;
Low-Power Design
;
Microelectronics
;
Wireless Systems
Abstract:
In near field wireless power links for biomedical implants, inductive voltage at receiver end (Rx) largely
exceeds the compliance of low voltage integrated power recovery circuits. To limit the magnitude of induced
signal, most of the low voltage (LV) integrated power recovery schemes employ methods like voltage clipping
and shunt regulation. These methods are proved to be power inefficient. Therefore, to overcome the voltage
limitation and to improve the power efficiency, we propose an on-chip high-voltage (HV) power recovery
scheme based on step-down approach, which allows supply voltage as high as 30V. The proposed design
comprises of enhanced semi-active HV bridge rectifier, reference voltage generator and HV series voltage
regulator. In addition, a battery management circuit that ensures safe and reliable charging of the implant
battery is proposed and implemented. The proposed design is fabricated with 0.35μm HV BCD technology
based on LOCOS 0.35μm CMOS process. Rectifier and r
egulator power efficacy are analyzed and compared
through simulation and measurement results.
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