5-GHz Band Highly Linear VCO IC with a Novel Resonant Circuit

This paper presents a 0.35-mum SiGe BiCMOS VCO IC exhibiting a linear VCO gain (Kvco) for 5-GHz band application. To realize a linear Kvco, a novel resonant circuit is proposed. The measured Kvco changes from 224 MHz/V to 341 MHz/V. The ratio of the maximum Kvco to the minimum one is 1.5 which is less than one-half of that of a conventional VCO. The VCO oscillation frequency range is from 5.45 GHz to 5.95 GHz, the tuning range is 8.8 %, and the dc current consumption is 3.4 mA at a supply voltage of 3.0 V. The measured phase noise is -116 dBc/Hz at 1MHz offset, which is similar to the conventional VCO

[1]  Y. Deval,et al.  Distributed MOS varactor biasing for VCO gain equalization in 0.13 /spl mu/m CMOS technology , 2004, 2004 IEE Radio Frequency Integrated Circuits (RFIC) Systems. Digest of Papers.

[2]  H. Samavati,et al.  5-GHz CMOS wireless LANs , 2002 .

[3]  Ning Li,et al.  A 2.4-GHz linear-tuning CMOS LC voltage-controlled oscillator , 2005, Proceedings of the ASP-DAC 2005. Asia and South Pacific Design Automation Conference, 2005..

[4]  H. Kondoh,et al.  A fully MMIC transceiver module for 5 GHz wireless communications , 2001, GaAs IC Symposium. IEEE Gallium Arsenide Integrated Circuit Symposium. 23rd Annual Technical Digest 2001 (Cat. No.01CH37191).

[5]  N. Itoh.  A study of capacitor-coupled varactor VCO to investigate flicker noise up-conversion mechanism , 2005, 2005 IEEE International Wkshp on Radio-Frequency Integration Technology: Integrated Circuits for Wideband Comm & Wireless Sensor Networks.

[6]  P. Wambacq,et al.  Low-power voltage-controlled oscillators in 90-nm CMOS using high-quality thin-film postprocessed inductors , 2005, IEEE Journal of Solid-State Circuits.