Dual-material phononic-chimney MEMS for ultra-stable 6G frequency references

SYNGI is seeking co-development and sponsored research partners to physically fabricate our proprietary Zero-TCE (ZTCE) Phononic-Chimney architecture. Next-generation Nanoelectromechanical Systems (NEMS) utilizing Thermal-Piezoresistive Resonators (TPRs) are fundamentally limited by parasitic frequency drift induced by internal Joule heating. Current stabilization methods rely on external phase-locked loops (PLLs), which negate the footprint advantage of nanoscale sensors. We have computationally verified a solid-state architecture that entirely decouples the mechanical and thermal domains, segregating acoustic confinement and thermal dissipation into separate spatial axes. By isolating an active monocrystalline silicon resonant core (85.5 MHz) with a Phononic Crystal (PnC) mechanical bandgap, and bypassing horizontal phonon scattering via massive Z-axis Gold thermal vents, we demonstrate a near-zero Temperature Coefficient of Elasticity (TCE) drift natively. Fully coupled ElmerFEM multiphysics simulations—explicitly penalized for Kapitza interfacial thermal resistance—confirm exceptional acoustic isolation (Q-factor > 1,000,000) while weaponizing the gold vias to clamp peak core thermal loads to 311.4 K. By restricting the thermal delta to approximately 1.25 K, this architecture clamps the uncompensated frequency drift to < 1 Hz, inherently achieving parts-per-billion stability without external closed-loop circuitry. We are actively seeking telecommunications and semiconductor partners to translate these validated matrices onto standard Silicon-On-Insulator (SOI) wafers for 6G on-chip timing applications.