摘要

This paper presents a 401-428-MHz BFSK/QPSK transmitter (TX) with two types of fractional-injection-locking techniques for multichannel transmission capabilities. A Delta Sigma-based injection-locked ring oscillator is proposed to achieve fine frequency tuning with a frequency resolution of 1.3 kHz. The proposed method facilitates multichannel BFSK modulation. For high data rate wideband QPSK modulation, frequency tuning is achieved through sequential injection locking. The TX performs 550 Kb/s for BFSK and 11 Mb/s for band-shaped QPSK with EVM of 4.4% and 4.9%, respectively. It also achieves a settling time of less than 0.8 mu s. This helps to save operating power of the wireless medical devices with duty-cycling protocol employed in the TX. Fabricated in 130-nm process technology, the TX achieves an energy efficiency of 370 pJ/b while delivering -13 dBm of output power with 1-V supply.

  • 出版日期2017-3