Solenoidal-DNA-configured transformers are fabricated in standard silicon substrate by using a post-CMOS concave-suspending MEMS process. The concavely suspended structure of the transformer effectively depresses the substrate effects including eddy current and capacitive coupling between the coil and the substrate, thereby, achieving both high Q-factor and high resonant frequency for the self-inductors. With broad useable frequency band for high mutual reactive coupling coefficient, high available gain is measured in wide frequency band for high performance radio frequency ICs