In this paper, we propose an LC-VCO using automatic amplitude control and filtering technique to eliminate frequency noise around 2ω0\documentclass[12pt]{minimal}
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\begin{document}$$\omega _0$$\end{document}. The LC-VCO is designed with TSMC 130 nm CMOS RF technology, and biased in subthreshold regime in order to get more negative transconductance to overcome the losses in the LC-Tank and achieve less power consumption. The designed VCO operates at 5.17 GHz and can be tuned from 5.17 to 7.398 GHz, which is corresponding to 35.5% tuning range. The VCO consumes through it 495–440.5 μ\documentclass[12pt]{minimal}
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\begin{document}$$\upmu$$\end{document}W from 400 mV dc supply. This VCO achieves a phase noise of -122.3\documentclass[12pt]{minimal}
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\begin{document}$$-\,122.3$$\end{document} and -111.7\documentclass[12pt]{minimal}
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\begin{document}$$-\,111.7$$\end{document} dBc/Hz at 1 MHz offset from 5.17 and 7.39 GHz carrier, respectively. The calculated Figure-of-merits (FoM) at 1 MHz offset from 5.17 and 7.39 GHz is -199.7\documentclass[12pt]{minimal}
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\begin{document}$$-\,199.7$$\end{document} and -192.4\documentclass[12pt]{minimal}
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\begin{document}$$-\,192.4$$\end{document} dBc/Hz, respectively. And it is under -190.5\documentclass[12pt]{minimal}
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\begin{document}$$-\,190.5$$\end{document} dBc/Hz through all the tuning range. The FoMT\documentclass[12pt]{minimal}
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\begin{document}$$_T$$\end{document} at 1 MHz offset from 5.17 GHz carrier is -210.6\documentclass[12pt]{minimal}
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\begin{document}$$-\,210.6$$\end{document} dBc/Hz. The proposed design was simulated for three different temperatures (-55\documentclass[12pt]{minimal}
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\begin{document}$$-\,55$$\end{document}, 27, 125∘C\documentclass[12pt]{minimal}
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\begin{document}$$125\,^{\circ }\hbox {C}$$\end{document}), and three supply voltages (0.45, 0.4, 0.35 V), it was concluded that the designed LC-VCO presents high immunity to PVT variations, and can be used for multi-standard wireless LAN communication protocols 802.11a/b/g.
