An LC-VCO Strongly Suppresses the AM-FM Conversion Caused by Varactor
نویسندگان
چکیده
A differential LC-VCO that adopts a transformer with asymmetric turns-ratio has been proposed. The asymmetric turns-ratio of the transformer leads to the suppression of the AM to FM conversion which is caused by the 1/f noise of the current source transistor. The analysis of the proposed scheme and the improvement in phase noise compare to conventional CMOS LC-VCOs are described. The transformer used in proposed VCO occupies about 430×430 μm2 of silicon area while the inductor in compared conventional VCO does 390 × 390 μm2. key words: LC-VCO, AM to FM conversion, 1/f noise, varactor nonlinearity, transformer, CMOS
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ورودعنوان ژورنال:
- IEICE Transactions
دوره 91-C شماره
صفحات -
تاریخ انتشار 2008