The present disclosure relates to methods and system that provides techniques of designing amplifiers with controllable gain for electrical signals/power based on capacitively transduced Micro and/or Nano electromechanical resonators. The present disclosure provides techniques of implementing an RF voltage amplifier, a phase shift amplifier, and/or an RF power amplifier through capacitively transduced Micro/Nano electromechanical resonators. In some embodiments, the amplifier is narrow-band with the centre frequency specified by the resonant frequency of the Micro/Nano electromechanical resonators. In addition, the present disclosure provides a technique by which a set of capacitively transduced Micro/Nano electromechanical resonators are implemented as RF power amplifier with multiple inputs and multiple outputs with the output voltage being measured at electrically floating electrodes that are capacitively coupled with the resonator. These electrically-floating electrodes can also be used to sum various output signals from a resonator and signals output from various resonators.