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This paper presents a wide-tuning frequency generation scheme based on bottom-series coupled quadrature VCO (QVCO). The low band and middle band frequency signal is generated from the QVCO while the high band signal is obtained from a gilbert mixer. The tuning-range enhancement technique allows a three band frequency generation in the range from 2.4GHz to 8.4GHz without penalizing its phase noise...
This paper presents a 0.6-V quadrature voltage-controlled oscillator (QVCO) with enhanced swing for low power supply applications. The QVCO comprises a novel capacitive coupling technique that is employed not only for quadrature signal coupling, but also for phase noise reduction. As a result, the proposed QVCO can even achieve 4.6 dB lower phase noise than its single-phase counterpart at 3-MHz offset...
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