Abstract: The noise behavior of deep sub micron CMOS Gilbert mixers is investigated.An analytical noise figure model of the mixers is derived.Prediction based on the analysis is compared with simulation results based on 0.25 μm CMOS technology.The maximum absolute prediction error is less than 1.5 dB and the relative prediction error is less than 12.5%.The technique is useful in providing a guide to the design of CMOS mixer.

Key words: mixer, deep submicron technology, noise, CMOS RF IC