A Novel Direct Injection-Locked QPSK Modulator Based on Ring VCO in 180 nm CMOS

作者：Lee Sang Yeop^*; Ito Hiroyuki; Ishihara Noboru; Masu Kazuya

来源：IEEE Microwave and Wireless Components Letters, 2014, 24(4): 269-271.

DOI：10.1109/LMWC.2014.2299534

• CMOS
• injection locking
• modulator
• quadrature phase-shift keying (QPSK)
• ring voltage-controlled oscillator (VCO)

A novel quadrature phase-shift keying (QPSK) modulator that employs injection locking for the phase modulation as well as the phase-locked clock generation is presented. By using the proposed simple modulator based on a ring voltage-controlled oscillator (VCO), many blocks in the conventional QPSK modulators are removed, and the total area can be reduced.
The proposed QPSK modulator was fabricated in a 180 nm CMOS, and occupies an area of 0.024 mm(2). The modulator achieves measured error vector magnitude (EVM) of 8.23% at 50.8Mb/s under QPSK modulation with the total power consumption of lower than 6 mW from a 1.8 V power supply.

• 出版日期2014-4