The working of a 2 GHz CMOS complementary voltage-controlled oscillator (VCO) with differentially tuned MOS varactors which is employed for ISM-band wireless communications applications is described. This VCO can reduce the adverse effect of high varactor sensitivity by rejecting the common-mode noise and its output frequency varies from 1827 to 2136 MHz with a 309 MHz or 16% tuning range. A high varactor sensitivity is unfavorable to phase noise performance where a band-switching topology can be employed to reduce its effect while maintaining the required frequency tuning range. The VCO has demonstrated that differentially tuned varactors can provide a wide tuning range and reject the common-mode noise.
|出版狀態||Published - 2006 四月 1|
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