Fully Differential Gyrator Using a Dynamically Biased 20 MHZ Lamé Mode Resonator

We demonstrate the first MEMS-only differential gyrator using a single Lamé mode electrostatic resonator. A gyrator is a two-port device that produces a pure non-reciprocal phase response and is considered a universal element from which isolators and circulators can be derived. We demonstrate in this work that gyration can be achieved using any electrostatic resonator, through very simple time-modulated biasing, without the need for any auxiliary spatio-temporal switching elements.

INTRODUCTION

Non-reciprocal RF devices are of high importance for directional routing of RF signals. These devices typically produce non-reciprocal amplitude responses and have been explored via time-modulated RF circuits and MEMS [1]–[3]. Gyrators, on the other hand, are two-port devices that generate a pure non-reciprocal phase response, i.e. a relative phase shift of π for signals propagating in opposite directions (Figure 1a).