SAW Resonator Oscillator Based Injection Locked OOK Transmitter For MedRadio Spectrum

This work presents a low power injection locked on-off keying (OOK) transmitter (TX) for the Medical Device Radio (MedRadio) communication band (401-406 MHz), which is suitable for health care applications. The TX is based upon a surface acoustic wave resonator (SAWR) oscillator, which directly generates a stable RF signal at 403.6 MHz and completely removes the power hungry frequency multiplying circuits from the transmitter. Designed and fabricated in 180 nm mixed mode CMOS technology, the measurement results of the SAWR oscillator show that it consumes 400 mu A current from 1 V supply and exhibits a phase noise of about -101 dBc/Hz for center frequency of 403.6 MHz at an offset of 300 kHz. The post layout simulation results show that the output radiated power from the proposed TX is -17 dBm while consuming total power of 940 mu W.