A Quadrature CMOS VCO Using Transformer Coupling and Current Reuse Topology

Shao-Hwa LEE  Yun-Hsueh CHUANG  Sheng-Lyang JANG  Ming-Tsung CHUANG  Ren-Hong YEN  

Publication
IEICE TRANSACTIONS on Communications   Vol.E90-B   No.2   pp.346-348
Publication Date: 2007/02/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e90-b.2.346
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Devices/Circuits for Communications
Keyword: 
CMOS,  quadrature voltage-controlled oscillators (QVCO),  current reuse,  transformer coupling,  

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Summary: 
A new current reused quadrature voltage controlled oscillator (QVCO) is proposed and implemented using UMC 0.18 µm CMOS 1P6M process. The proposed circuit topology is made up two low voltage LC-tank VCOs, where the QVCO is obtained using the transformer coupling and current reuse technique. At 1.8 V supply voltage, the phase noise of the VCO is -117.13 dBc/Hz at 1 MHz offset frequency from the carrier frequency of 2.18 GHz, the core power consumption is 4.14 mW, the total power consumption is 6.48 mW and tuning range is about 160 MHz.