A CMOS quadrature VCO implemented with direct capacitor injection-locking

作者：Jang Sheng Lyang^*; Lin Yu Sheng; Chang Chia Wei; Hsue Ching Wen; Juang Miin Horng; Teng Heng Fa

来源：Microwave and Optical Technology Letters, 2013, 55(11): 2528-2531.

DOI：10.1002/mop.27884

• quadrature voltage-controlled oscillators
• first harmonic injection locking
• Colpitts oscillator
• varactor

This article presents a new quadrature voltage-controlled oscillator (QVCO). The LC-tank QVCO consists of two first-harmonic injection-locked oscillators (ILOs). The outputs of one ILO are injected to the common nodes of capacitors on the other ILO and vice versa so as to force the two ILOs operate in quadrature. At the supply voltage of 1.1 V, the total power consumption is 5.94 mW. The free-running frequency tuning range is 11.5%, tunable from 6.56 to 7.36 GHz as the tuning voltage is varied from 0.0 to 2 V. The QVCO has been implemented with the TSMC 0.18-m CMOS technology and the die area is 0.504 x 0.803 mm(2). The measured phase noise at 1-MHz offset is -123.01 dBc/Hz at the oscillation frequency of 7.34 GHz and the figure of merit of the proposed QVCO is about -192.5 dBc/Hz.

• 出版日期2013-11