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Title: A 50-Mb/s CMOS QPSK/O-QPSK transmitter employing injection locking for direct modulation
Authors: Diao, S.
Zheng, Y.
Gao, Y.
Cheng, S.-J.
Yuan, X.
Je, M.
Heng, C.-H. 
Keywords: CMOS
injection locking (IL)
low power
offset quadrature phase-shift keying (O-QPSK)
pill camera
quadrature phase-shift keying (QPSK)
Issue Date: Jan-2012
Citation: Diao, S., Zheng, Y., Gao, Y., Cheng, S.-J., Yuan, X., Je, M., Heng, C.-H. (2012-01). A 50-Mb/s CMOS QPSK/O-QPSK transmitter employing injection locking for direct modulation. IEEE Transactions on Microwave Theory and Techniques 60 (1) : 120-130. ScholarBank@NUS Repository.
Abstract: A 50-Mb/s quadrature phase-shift keying (QPSK)/offset quadrature phase-shift keying (O-QPSK) transmitter suitable for biomedical high-quality imaging application is presented. Centered at 915 MHz, the phase modulation is achieved by directly modifying the self-resonant frequency of an LC voltage-controlled oscillator through capacitor bank switching. By eliminating many unnecessary building blocks in the conventional QPSK/O-QPSK transmitter, significant power and area savings are achieved. Implemented in 0.18-μm CMOS technology, it occupies an active core area of 0.28 mm 2. With 305-MHz injection frequency and consuming 5.6 mW under 1.4-V supply, the transmitter achieves error vector magnitude (EVM) of 11.4%/5.97% for O-QPSK/QPSK modulation while delivering output power of -3 dBm at 50 Mb/s. By lowering the injection frequency to 101.67 MHz, it consumes 5.88 mW under the same supply voltages while delivering an output power of -3.3 dBm. The transmitter achieves measured EVM of 6.4% at 50 Mb/s under QPSK modulation. © 2006 IEEE.
Source Title: IEEE Transactions on Microwave Theory and Techniques
ISSN: 00189480
DOI: 10.1109/TMTT.2011.2174377
Appears in Collections:Staff Publications

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