Title :
A Wide-tuning-range VCO with Small VCO-gain Fluctuation for Multi-band W-CDMA RFIC
Author :
Nakamura, Takahiro ; Masuda, Toru ; Shiramizu, Nobuhiro ; Washio, Katsuyoshi ; Kitamura, Tomomitsu ; Hayashi, Norio
Author_Institution :
Central Res. Lab., Hitachi, Ltd., Kokubunji
Abstract :
A novel wide-tuning-range LC-tuned voltage-controlled oscillator (LC-VCO) - featuring small VCO-gain (KVCO) fluctuation - was developed. For small KVCO fluctuation, a serial LC-resonator that consists of an inductor, a fine-tuning varactor, and a capacitor bank was added to a conventional parallel LC-resonator that uses a capacitor bank scheme. The resonator was applied to a 3.9-GHz VCO for multi-band W-CDMA RFIC fabricated with 0.25-mum Si-BiCMOS technology. The VCO exhibited KVCO fluctuation of only 21%, which is one third that of a conventional VCO, with 34% tuning range. The VCO also exhibited a low phase noise of -121 dBc/Hz at 1-MHz offset frequency and a low current consumption of 4.0 mA
Keywords :
BiCMOS integrated circuits; code division multiple access; inductors; phase noise; radiofrequency integrated circuits; resonators; silicon compounds; varactors; voltage-controlled oscillators; 0.25 micron; 1 MHz; 3.9 GHz; 4.0 mA; BiCMOS technology; RFIC; Si; capacitor bank; fine-tuning varactor; inductor; multiband W-CDMA; parallel LC-resonator; voltage-controlled oscillator; Capacitors; Fluctuations; Frequency; Inductors; Multiaccess communication; Phase noise; Radiofrequency integrated circuits; Tuning; Varactors; Voltage-controlled oscillators;
Conference_Titel :
Solid-State Circuits Conference, 2006. ESSCIRC 2006. Proceedings of the 32nd European
Conference_Location :
Montreux
Print_ISBN :
1-4244-0303-0
DOI :
10.1109/ESSCIR.2006.307477
