Differential oscillators are typically used in high-speed, high-performance systems where high stability and low jitter are required. Most oscillator datasheet specifications are based on tests conducted in an ideal lab environment. Although differential oscillators are designed for higher performance, this performance is not always maintained in the end applications when systems are subjected to real-world conditions. Shown here is an Elite Platform™ MEMS oscillator architecture that is designed to provide the highest performance in dynamic real-world environments. Central to this architecture is the use of two small MEMS resonators: (1) a TempFlat resonator which has a flat frequency vs. temperature response and provides the reference frequency to the phase locked loop (PLL), and (2) a TempSense resonator that has a fairly steep but linear frequency response of -7 ppm/°C, which makes it a great temperature sensor. These two resonators share the same die substrate with less than 200 µm separation to ensure the best possible thermal coupling between them. This level of thermal coupling between temperature sensor and resonator is not possible in quartz oscillators because of the physical separation between the quartz resonator and temperature sensor that resides on the IC containing the oscillator circuit.