Abstract
AbstractThis work presents a technique to enhance the performance of the conventional PMOS Colpitts VCO circuit. This technique is accomplished by adding an NMOS cross‐coupled pair under the traditional differential Colpitts VCO to enhance the oscillator startup condition. The signal analysis also supports this viewpoint and presents a device‐choosing method to optimize the output power and phase noise. In realization, the circuit in the CMOS 0.18‐μm technology, a U‐shaped inductor, and thick oxide varactors are adopted in circuit to increase the quality factor of resonant tank. The performance of VCO demonstrates a center frequency of 16.7 GHz, a FOM of −186.2 dBc/Hz, and the phase noise of −110.42 dBc/Hz at the 1 MHz offset from the oscillation frequency. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 3160–3164, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23944
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