CMOS quadrature voltage-controlled oscillator using the diode coupling technique

✍ Scribed by Sheng-Lyang Jang; Chia-Wei Chang; Hsiu-An Yeh; Miin-Horng Juang; Yi-Jhe Song

• Publisher: John Wiley and Sons
• Year: 2011
• Tongue: English
• Weight: 355 KB
• Volume: 53
• Category: Article
• ISSN: 0895-2477
• DOI: 10.1002/mop.25774

✦ Synopsis

Abstract

A diode‐ring coupling technique has been used to design quadrature voltage‐controlled oscillators (QVCOs), which consist of two n‐core VCOs.The proposed CMOS QVCOs have been implemented with the TSMC 0.18 μm CMOS technology. A single‐band and a dual‐band QVCOs have been implemented to support the feasibility of the coupling technique. The die area of the single‐band QVCO is 0.506 × 0.905 mm^2^. At the supply voltage of 0.54 V, the total power consumption is 1.78 mW. The free‐running frequency of the QVCO is tunable from 4.295 to 5.185 GHz as the tuning voltage is varied from 0.0 to 1.1 V. The measured phase noise at 1 MHz frequency offset is −114 dBc/Hz at the oscillation frequency 4.587 GHz, and the figure of merit of the proposed QVCO is −184.73 dBc/Hz. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:551–553, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25774