Abstract

The voltage-controlled-oscillator (VCO) is one of the most important building blocks in the system. The chip fabrication of VCO is made by TSMC 0.18μm 1P6M CMOS standard process. The chip presents a low power and low phase noise for IEEE 802.11a applications, the PMOS casecode and current-reuse cross-couple technology are designed to improve phase noise and reduce power. The measured results of phase noise is-120.87 dBc/Hz at 1MHz offset frequency from the carrier frequency 5.05 GHz, and operates frequency from 5.04 GHz to 5.895 GHz with a tuning range of 17.14%. Under supply voltage 1.65V, the core power dissipation is 4.05 mW.

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