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An Inductive Power and Data Telemetry Subsystem With Fast Transient Low Dropout Regulator for Biomedical Implants
IEEE Transactions on Biomedical Circuits and Systems
|August 19, 2015
Summary
This study introduces a novel capacitorless low-dropout (LDO) regulator for implantable devices, featuring fast transient response and integrated data telemetry. This innovation enhances wireless transmission for neural recordings with a compact, efficient design.
Area of Science:
- Biomedical Engineering
- Electrical Engineering
- Integrated Circuit Design
Background:
- Fully implantable wireless transmission systems require efficient power management and data communication.
- Existing low-dropout (LDO) regulators often necessitate large external capacitors, increasing implant size.
- Efficient bidirectional communication is crucial for transmitting neural data without interfering with power delivery.
Purpose of the Study:
- To develop a capacitorless LDO regulator with a fast transient response for implantable applications.
- To integrate a data reverse telemetry circuit for wireless data transmission using the same coil.
- To minimize the size and complexity of implantable medical devices.
Main Methods:
- A novel hybrid feedback structure combined with high-frequency compensation technology was employed for the LDO regulator.
- Load-shift-key (LSK) modulation was utilized for the reverse data telemetry circuit.
- The circuit was fabricated using a 0.18 μm complementary metal-oxide-semiconductor (CMOS) technology.
Main Results:
- The capacitorless LDO regulator demonstrated a fast transient response with overshoot/undershoot voltages below 45 mV and 55 mV, respectively.
- A rapid load current change (15 mA) with rising/falling times under 100 ns was supported.
- The integrated LSK transceiver achieved efficient bandwidth utilization for low carrier frequency operation.
- The implantable chip achieved an output power of 15 mW at a 1.15 V operating voltage.
Conclusions:
- The proposed capacitorless LDO regulator with integrated LSK telemetry offers a compact and efficient solution for fully implantable wireless systems.
- The hybrid feedback and high-frequency compensation techniques successfully achieved fast transient response, crucial for stable operation.
- The LSK modulation with a digitized demodulator enhances bandwidth efficiency, enabling reliable neural data transmission.
