Broad-band direct QPSK modulator/demodulator for wireless gigabit communication

Autor: Yuxiong Cao, Zhi Jin, Xinyu Liu, Danyu Wu
Rok vydání: 2013
Předmět:
Zdroj: Chinese Science Bulletin. 58:427-432
ISSN: 1861-9541
1001-6538
DOI: 10.1007/s11434-012-5566-4
Popis: The design and measured results of a broad-band direct quadrature phase shift keying (QPSK) modulator and demodulator are described in this paper. The circuits are fabricated using 1-μm GaAs HBT technology. To suppress the local oscillator (LO) leakage, the double-balanced mixer is selected as the core unit in the modulator/demodulator. An embedded four-way quadrature divider which includes a Lange coupler and two Baluns is utilized in the system to generate quadrature-phase LO signals. As results of a back-to-back test, the system can operate at data rates in excess of 2 Gb/s (1 Gb/s per I and Q channels) at 30 GHz. The supplies of the modulator and demodulator are 5.0 V and 4.5 V with size of 1.35 mm×3.5 mm and 1.36 mm×3.4 mm, respectively.
Databáze: OpenAIRE
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