A Self-Sustained CMOS Microwave Chemical Sensor Using a Frequency Synthesizer. - Ahmed A. Helmy; Hyung-Joon Jeon; Yung-Chung Lo; Andreas J. Larsson; Raghavendra Kulkarni; Jusung Kim; José Silva-Martínez; Kamran Entesari (IEEE J. Solid State Circuits, 2012)