The MultiMode technology consists of:

• A triple mode oscillator
• Frequency measurement system
• Microprocessor with memory
• Digitally controlled frequency synthesizer

connected to a low-cost AT-Cut crystal resonator.

The triple mode oscillator produces 3 independent output frequencies, each linked to a different resonance of the crystal resonator. These 3 frequencies each have a different temperature behavior, and thereby the delta frequencies also have a unique temperature dependency. The temperature dependency is calibrated during production and callibration data is stored in memory. During normal operation this information is used by the on-board algorithm. This algorithm accurately compensates the temperature behaviour of the crystal. To this end the algorithm uses 3 independent resonator frequencies of the crystal, and compensates through frequency synthesis.