標題: A X-Band Capacitor-Coupled QVCO Using Sinusoidal Current Bias Technique
作者: Shen, I-Shing
Jou, Christina F.
電信工程研究所
Institute of Communications Engineering
關鍵字: Quadrature voltage-controlled oscillator (QVCO);sinusoidal bias technique;capacitor-coupled;phase noise;oscillation amplitude
公開日期: 1-二月-2012
摘要: This study introduces an X-band quadrature voltage-controlled oscillator (QVCO) based on two novel techniques: capacitor coupling and sinusoidal current biasing. The proposed QVCO achieves an excellent figure-of-merit (FOM) of 190.5 dBc/Hz. This study analyzes the properties of this QVCO, including its phase noise, oscillation frequency, and amplitude. To generate quadrature phase signals with low phase noise, the proposed design uses two capacitor-coupled LC-tank cores instead of active device-coupled cores. Sinusoidal currents through these capacitors bias the oscillator, increasing oscillation amplitude and reducing the phase noise contribution from cross-coupled transistors compared to existing QVCOs or VCOs biased with a constant current. These two techniques allow the proposed QVCO to achieve at least a theoretical 3 dB phase noise improvement compared to conventional LC-QVCOs. Implemented in a standard 0.18 mu m CMOS process, the proposed QVCO had a frequency tuning range of 9.2 similar to 10.4 GHz and a phase noise of -115.7 dBc/Hz@1 MHz from a carrier of 10.4 GHz while consuming 3.6 mW with 1.5 V voltage supply.
URI: http://hdl.handle.net/11536/16150
ISSN: 0018-9480
期刊: IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
Volume: 60
Issue: 2
結束頁: 318
顯示於類別:期刊論文


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