Mustafijur Rahman, Ramesh Harjani

Research output: Chapter in Book/Report/Conference proceedingChapter


In this chapter we present 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 transmitter power consumption and enables channel selection using an integer-N PLL running at 800 MHz. The modulation technique does not require phase calibration and resolves the problems of traditional injection lock-based modulators. The prototype transmitter consumes 2.4 mW while delivering − 10 dBm RF power at the TX output resulting in an energy efficiency of 2.5 nJ/bit at 1.2 Mbps raw data rate. The measured RMS EVM for π∕4 DQPSK modulation is 3.21%.

Original languageEnglish (US)
Title of host publicationAnalog Circuits and Signal Processing
Number of pages18
StatePublished - 2020

Publication series

NameAnalog Circuits and Signal Processing
ISSN (Print)1872-082X
ISSN (Electronic)2197-1854

Bibliographical note

Publisher Copyright:
© 2020, Springer Nature Switzerland AG.


  • 802.15.6
  • Injection locking
  • Low power
  • RF
  • Transmitter
  • WBAN
  • π/4 DQPSK


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