A 50-Mb/s CMOS QPSK/O-QPSK Transmitter Employing Injection Locking for Direct Modulation

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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-mu m 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.
Publisher
Institute of Electrical and Electronics Engineers (IEEE)
Issue Date
2012-01
Language
English
Article Type
Article
Citation

IEEE Transactions on Microwave Theory and Techniques, v.60, no.1, pp.120 - 130

ISSN
0018-9480
DOI
10.1109/tmtt.2011.2174377
URI
http://hdl.handle.net/10203/279612
Appears in Collection
EE-Journal Papers(저널논문)
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