A 22µW, 2.0GHz FBAR oscillator

We present a 22μW, 2.0GHz FBAR oscillator - the lowest power reported to date for a GHz-range oscillator of this type. Low power consumption is achieved through co-design with a high R
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FBAR resonator and a weakly-forward biased bulk connection. An oscillator with a standard bulk connection was fabricated for comparison. The chip was fabricated in a 0.18μm CMOS process. The weakly-forward biased bulk led to a 41% reduction in power dissipation. The measured phase noise is -121dBc/Hz at a 100kHz offset.