Low-phase-noise Cmos Vco with Harmonically Tuned Lc Tank
نویسندگان
چکیده
A low-phase-noise voltage-controlled oscillator (VCO) has been demonstrated using a harmonically tuned LC resonance tank. In this circuit configuration, the voltage shape at the differential cell is almost rectangular; thus, the cell is switched effectively and the phase noise is reduced. More importantly, the proposed tank suppresses downconversion of the noise around 2f0 to the phase noise, due to the 2 nd harmonic short of the tank. Therefore, the phase noise of the VCO based on the tank is improved considerably. The VCO for 1-GHz operation has been realized using a 0.35m CMOS process. It shows a phase noise of 111.6 dBc/Hz at 100 KHz offset, which is a 5.7-dB improvement over a comparable standard VCO. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 42: 164–167, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop. 20240
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