An IEEE 802.15.6 Standard Compliant 2.5 nJ/Bit Multiband WBAN Transmitter Using Phase Multiplexing and

Abstract

This paper describes an 802.15.6 compliant 2360–2484 MHz multiband transmitter that digitally multiplexes the appropriate phases from an 800 MHz poly-phase filter output to generate π/4 DQPSK signals at 2 .4 GHz using injection locking. Modulation at one-third the RF frequency reduces the trans- mitter power consumption and enables channel selection using an integer-N PLL running at 800 MH z. The modulation technique does not require phase calibration and resolve s the problems of traditional injection lock based modulators. The prototype trans- mitter consumes 2.4 mW while delivering 10 dBm RF power at the TX output resulting in an energy ef ficiency of 2.5 nJ/bit at 1.2 Mbps raw data rate. The measured RMS EVM for π/4 DQPSK modulation is 3.21%.