A transceiver with injection-locked frequency multiplier for short-range wireless applications

A transceiver with injection-locked frequency multiplier is presented in 0.18-μm CMOS technology for short-range wireless medical applications. The injection-locked technique is applied to a frequency multiplier to synthesize the low-phase-noise RF carrier of the transmitter, where a crystal oscillator is used as the signal source for injection and an 888-MHz carrier is synthesized from the 55.5-MHz crystal by the frequency multiplier. At 888 MHz, the injection-locked frequency multiplier exhibits low phase noise of −116 dBc/Hz within offset frequency range from 100 kHz to 1 MHz. In addition, a receiver is implemented by adopting envelope detection architecture. The transmitter delivers an output power of −14 dBm at 22.2 mW and the receiver achieves a sensitivity of −58 dBm at 4.1 mW. With off-chip antennas, a wireless link can be established by the transmitter and the receiver at a distance of 30 cm. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:2733–2737, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26387