A CMOS Inductorless MedRadio OOK Transceiver with a $42\ \mu \text{W}$ Event-Driven Supply-Modulated RX and a 14% Efficiency TX for Medical Implants
Abstract
An inductorless MedRadio (413∼419 MHz) OOK transceiver for an implantable brain-machine interface (BMI) in 180 nm CMOS is presented. An event-driven supply modulation (EDSM) technique is introduced in the receiver to lower the power consumption to 42/92 μW at 1/10 kbps, achieving -79/-74 dBm sensitivity (at 0.1% BER). The transmitter employs a current-starved ring oscillator with an automatic frequency calibration loop, achieving 14% efficiency for random OOK data at -4 dBm output power. Wireless connection, benchtop, multi-user coexistence, and in-vitro phantom test results are demonstrated.
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