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|標題:||High-frequency low-noise voltage-controlled LC-tank oscillators using a tunable inductor technique|
|期刊/報告no：:||Ieice Transactions on Electronics, Volume E89C, Issue 11, Page(s) 1567-1574.|
|摘要:||This paper describes 3-GHz and 7-GHz tunable-inductance LC-tank voltage-controlled oscillators (VCOs) implemented in 0.18-mu m CMOS technology. Unlike the traditional tuning method by a varactor, a tunable inductor is employed in the VCO by using a transformer to compensate for the energy loss. The VCO facilitates the tuning frequency and low noise of the output signals, together with a variable inductor which satisfies both criteria. The 3-GHz VCO using a symmetry transformer provides the tuning range of 2.85 to 3.12 GHz at 1-V supply. The power consumption is 4.8 mW while the measured phase noise is -126 dBc/Hz at 1-MHz offset from a 2.85-GHz carrier. A small-area stacked transformer is employed in the 7-GHz VCO, which achieves a tuning range of 6.59 to 7.02 GHz and measured phase noise of -114 dBc/Hz at 1-MHz offset from a 6.59-GHz carrier while consuming 9 mW from a 1.2-V supply.|
|Appears in Collections:||電機工程學系所|
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