A Low-Power Dual-Injection-Locked RF Receiver With FSK-to-OOK Conversion for Biomedical Implants

We present in this paper an ultra low power ISM band RF receiver intended for implantable biomedical devices. The proposed circuit, which represents the reception part of a new energy-efficient RF FSK transceiver, consist of an FSK receiver (Rx) with OOK fully passive wake-up device (WuRx). This WuRx is batteryless with energy harvesting technique which plays an important role in making the RF transceiver energy-efficient. This proposed receiver is achieved with a reduced hardware architecture which does not use an accurate local oscillator, high Q external inductor and I/Q signal path. The circuit is base on a dual injection locked FSK-to-ASK conversion technique. The circuit is implemented in IBM 0.13 μm CMOS technology with 1.2 V supply voltage. This WuRx achieves a data rate of 100 kbps for 0.2 μW power dissipation at -53 dBm input signal. The Rx shows -78 dBm sensitivity for 8 Mbps data rate while consuming 639 μW power.