Micromechanical mixer-filters (Mixlers)

A device comprised of interlinked micromechanical resonators with capacitive mixer transducers has been demonstrated to perform both frequency translation (i.e., mixing) and highly selective low-loss filtering of applied electrical input signals. In particular, successful downconversion of a 200-MHz radio frequency (RF) signal down to a 37-MHz intermediate frequency (IF) and subsequent high-Q bandpass filtering at the IF are demonstrated using this single, passive, micromechanical device, all with less than 13 dB of combined mixing conversion and filter insertion loss. The mixer-filter (or mixler) RF-to-IF voltage transfer function is shown to depend upon a ratio of local oscillator amplitude and applied bias voltages.