Abstract
This paper presents a fully integrated 1.8 GHz, 0.35-/spl mu/m CMOS quadrature voltage-controlled oscillator (QVCO) design. The topology uses coupled ring oscillators to produce quadrature outputs. In order to gain better phase noise performance LC-based filtering is introduced to QVCO. Also using variable inductance concept, a 1.2 GHz tuning range is achieved. According to simulation results, proposed QVCO draws 26.1 mA from 3.3V supply and exhibits a worst-case phase noise of -117.3 dBc/Hz at 1-MHz offset over the tuning range.
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