  This paper reports result of calculation and experimental realization of an
electromechanical system that consists of a high-Q mechanical oscillator
parametrically coupled in the manner of a capacitive transducer with a RF
circuit, which is in turn inductively coupled with another RF circuit. The
system operates in the resolved sideband regime when the mechanical
oscillator's frequency is larger than the electrical circuits' bandwidths.
Using two coupled RF circuits allowed one to enhance the interaction between
them and the mechanical oscillator which is one of flexural vibrational modes
of a free-edge circular silicon wafer. Such a coupled electromechanical system
can be used as a high-sensitive capacitive vibration sensor.
