A 1.5GHz CMOS/FBAR frequency reference with ±10ppm temperature stability

A temperature compensated 1.5GHz FBAR-based frequency reference implemented in a 0.35µm CMOS process is presented. The ultra-small form factor and low power dissipation of a temperature compensated FBAR oscillator presents a promising alternative for replacement of quartz crystal frequency references. The measured frequency post-compensation drift over a 0-100°C temperature range is ≪20ppm. The measured phase noise is -125dBc/Hz at 100 kHz offset from carrier. The overall system power consumption is 960µW.

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