Design of Mode-Separation Filters for Dual-Mode Oscillator with SC Quartz Resonator Operating at Elevated Temperatures

The paper describes the design and evaluation of the specific impedance filters for separation of two vibration modes, excited in a stress compensated quartz resonator, operating in the dual-mode crystal oscillator. The goal is to improve the separation of modes in the two gain loops of dual-mode crystal oscillator which can operate over a wide temperature range up to 200 degrees C.