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Table 1. Compare fundamental and subharmo nic VCO.

Fundamental Subharmonic

Freq 4.8 GHz 9.6 GHz

Output Power –0.942 dBm –9.751 dBm

Phase Noise –107.2 dBc/Hz –114.8 dBc/Hz

Table 2. Compare with other VCO designs.

Reference fc(GHz) Phase

noise(dBc/Hz) Device

[11] 8.7 –110 SiGe BiCMOS

[12] 2.2 –111 CMOS0.35 μm

[13] 11.02 –86.83 CMOS RF

[14] 1.6 –114.7 CMOS 0.18˚ μm

This Work 9.6 –114.8 CMOS 0.18˚ μm

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