Abstract

In this paper, a new automatic amplitude control (AAC) scheme for the design of low-noise, low power LC-VCO is presented. Instead of using a traditional current source, a digitally-tuned resistor array is introduced to improve phase noise performance of LC-VCO. The proposed LC-VCO is designed in 0.18um RF CMOS process, and the tuning range is from 1.4GHz to 2.3GHz under a control voltage from 0.1V to 1.7V. The typical phase noise is -127.23dBc/Hz at 1MHz offset from a 1.85GHz carrier while consuming 496μA current from a 1.8V supply. The FoM and FoMT of the proposed VCO are - 193.06dBc/Hz and -206.7dBc/Hz respectively.

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