A 10 GHz low phase-noise CMOS voltage-controlled oscillator using dual-transformer technology |
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Authors: | Hsien-Chin Chiu Chia-Shih Cheng Yi-Tzu Yang Chien-Cheng Wei |
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Affiliation: | Chang Gung University, Department of Electronics Engineering, Tao-Yuan, Taiwan 333, ROC |
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Abstract: | A novel low phase-noise differential Colpitts VCO by using transformer feedback technology is presented in this paper. This work demonstrates a simple differential topology with dual-transformer approach to reduce phase-noise at low DC power consumption. A symmetrical circuit layout can be realized easily by transformers and a commonly cross-coupled structure is not adopted herein because cross couple feedback path is also a serious parasitic effect more at 10 GHz operation. Therefore, dual-transformers provide a compact feedback path and DC feed path simultaneously. Consuming a DC power of 8 mW in the VCO core, the circuit exhibits a phase-noise of ?115 dBc/Hz at offset frequency of 1-MHz and the figure of merit value is ?184.1 dBc. |
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