Synchronization in a network of coupled MEMS-Colpitts oscillators

The experimental characterization of a network of three resistively coupled microelectromechanical systems (MEMS)-based Colpitts oscillators is presented. The oscillators were fabricated on a printed circuit board and comprised of a 16 MHz quartz resonator in a positive feedback loop, which generated a sustained limit cycle oscillation when powered by a DC voltage supply. It was demonstrated that by varying the coupling strength and uncoupled frequency distribution between the oscillators, frequency synchronization and phase relationships could be controlled. This was examined in isolated pairs of oscillators and in cases where the entire network was interacting. Coupling was achieved with discrete resistors that could be autonomously interchanged with digitally controlled switches. These results build upon a small body of experimental studies by examining a coupling architecture wherein impedance interactions between the oscillators made amplitude dynamics relevant. This is a fundamental step toward fully understanding patterns and behavior in practical networks of coupled MEMS oscillators. The potential for the network to be used in neuromorphic computing and pattern recognition applications is also discussed.