HEMT\'s offer the lowest noise figure when compared to all other devices. Theyare however, not the first choice for VCO\'s. The main reason for this the high1/f noise. HEMT\'s have very high 1/f noise corner frequencies when comparedto other devices, especially HBT\'s. This 1/f noise gets upconverted close to thecarrier and gives poor phase noise performance. 1/f noise upconversion can bereduced by good circuit design. The main aim of this work was toreduce the1/f noise upconversion by circuit enhancements. No work was doneto reduce thedevice 1/f noise.