2010 · 28 citations · 20 references
Medical ElectronicsEngineeringRadio FrequencyDemodulator BenefitsBiomedical EngineeringWireless Implantable DeviceMedical InstrumentationElectromagnetic CompatibilityBiomedical DevicesModulation TechniqueData RateElectrical EngineeringEnergy HarvestingImplantable SensorHigh-frequency DeviceAntennaComputer EngineeringImplantable DevicesImplantable DeviceMicroelectronicsSignal ProcessingLow-power ElectronicsBiomedical SensorsBioelectronicsCarrier-frequency-independent Bpsk DemodulatorBiomedical InstrumentationWirelessly-powered Biomedical ImplantsWireless Power TransferElectrophysiologyMedical DevicesReadout Circuits
The study introduces a carrier‑frequency‑independent noncoherent BPSK demodulator for wirelessly‑powered biomedical implants that achieves a 100 % data‑rate‑to‑carrier‑frequency ratio. The demodulator detects data by edge‑based detection of the digitized carrier, implemented in a 0.18‑µm CMOS circuit that operates independently of carrier frequency and consumes only 119 µW at 10 Mbps. Simulation and prototype experiments confirm the design delivers ultra‑low power (119 µW at 10 Mbps) while maintaining a 100 % data‑rate‑to‑carrier‑frequency ratio, enabling high data rates at low carrier frequencies for implantable applications.
A novel noncoherent BPSK demodulator is presented for wirelessly-powered biomedical implants. The received data are detected based on rising or falling edge of the digitized carrier, while all components of the circuit are independent of the carrier frequency. Besides simplicity and ultra low-power consumption, the proposed demodulator benefits from an outstanding data-rate-to-carrier-frequency ratio of 100%. Thus, it can easily achieve high data rates with lower carrier frequencies, which is desirable in implantable biomedical applications such as visual prostheses. The circuit is designed and simulated in a 0.18-μm standard CMOS technology and merely consumes 119-μW@1.8V at a data rate of 10 Mbps. The proposed idea is also supported by experimental results of a proof-of-concept prototype.
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Maysam Ghovanloo, S. Atluri · IEEE Transactions on Circuits and Systems I Fundamental Theory and Applications · 2007 · 197 citations