parasitic feed - through capacitance effects in a resonator circuit are reduced by separating the resonator signal from the feed - through capacitance signal and then detecting the resonator signal with comparator circuitry . in specific embodiments , the separation of the resonator signal from the feed - through capacitance signal is effected by serial integrator and differentiator circuitry or by trans - impedance amplifier circuitry . the comparator circuitry can include control / delay circuitry for enabling the comparator at a correct time when feed - through capacitance signal has dissipated . the invention can be implemented using microelectromechanical sensors in a strain gauge function .