Patent ID: 8242663
Filing Date: 2012-08-14
Classification: H03B,H03H

Abstract:
1. An oscillator comprising: a micro-electromechanical resonator having first and second electrodes, said micro-electromechanical resonator configured to resonate at a first frequency when the first and second electrodes are carrying in-phase signals and resonate at a second frequency when the first and second electrodes are carrying out-of-phase signals, said micro-electromechanical resonator comprising a thin-film piezoelectric material that supports resonant operation of the micro-electromechanical resonator; and a driver circuit configured to selectively sustain either the in-phase signals or the out-of-phase signals on the first and second electrodes so that the resonator selectively resonates at either the first frequency or the second frequency, respectively, said driver circuit comprising first and second inverting amplifiers, which are serially connected between the first and second electrodes to thereby sustain the in-phase signals, and a switch configured to bypass one of the first and second inverting amplifiers to thereby sustain the out-of-phase signals at 180° relative to each other.