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A 27-Mbps, 0.08-mm3 CMOS Transceiver with Simultaneous Near-field Power Transmission and Data Telemetry for
Jordan Thimot1, Kukjoo Kim1, Chen Shi1
1Bioelectronic Systems Lab, Department of Electrical Engineering, Columbia University, New York NY.
Proceedings of the ... Custom Integrated Circuits Conference. Custom Integrated Circuits Conference
|July 26, 2021
Summary
This study presents a tiny, flexible CMOS transceiver for implantable systems, enabling high-speed, two-way data and power transmission wirelessly. It achieves 27 Mbps uplink and 6.6 kbps downlink through 1 mm of tissue.
Area of Science:
- Biomedical Engineering
- Electrical Engineering
- Microsystems Engineering
Background:
- Implantable systems require efficient wireless power and data transfer.
- Miniaturization and biocompatibility are critical challenges for implantable devices.
- Existing solutions often face limitations in data rates, power efficiency, or form factor.
Purpose of the Study:
- To develop a compact, inductively powered CMOS transceiver for implantable systems.
- To enable simultaneous two-way near-field data telemetry and power transmission.
- To achieve high data rates and efficient power transfer in a flexible, tissue-like form factor.
Main Methods:
- Designed a CMOS transceiver with integrated RF receiver coils.
- Utilized a four-coil inductive link operating at 27 MHz for power and 700 MHz for data.
- Implemented amplitude-shift-keying (ASK) for downlink and load-shift keying (LSK) backscattering for uplink.
- Employed post-processing to achieve a 15-µm chip thickness for flexibility.
Main Results:
- Achieved a 27 Mbps uplink and 6.6 kbps downlink data rate.
- Transceiver power consumption is 2.7 mW, supporting an additional 1.5 mW load.
- Demonstrated a 1.04% power transfer efficiency through 1 mm of tissue phantom.
- Integrated all necessary power harvesting and control circuitry within a minimal area.
Conclusions:
- The developed transceiver meets the requirements for advanced implantable systems.
- The flexible, miniaturized design facilitates seamless integration with biological tissues.
- This technology enables high-performance wireless communication and power for next-generation medical implants.
