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ECE at the University of Utah presents:

"Low Power Frequency Generation Using FBAR/IC Integration"
with:
Dr. Julie Hu
Postdoctoral Researcher
Electrical Engineering
University of Washington

Abstract:
Advances in semiconductor technology have stimulated unprecedented innovations in the development of wireless sensing and medical care products, particularly low-cost, small form-factor, wireless sensors and medical implantable devices. Today, integrated circuit technologies allow integration of analog, RF, and digital circuitry in a single chip. Low power consumption is crucial to successful deployment of these small devices since they must operate on limited energy budgets (none of those devices currently use scavenged power -- it is just an idea so far). While the digital portion of the circuits have scaled well with the technology, analog/RF doesn't benefit quite as much from smaller features. The major issues include low supply voltage, low device gain, and more seriously, on-chip inductors with low quality factor and inefficient silicon usage. In short, a new analog/RF design methodology is needed that takes advantage of technology scaling and benefits this emerging generation of wireless devices.

In this talk, I will discuss the benefit of using the high quality factor FBAR (Film Bulk Acoustic-wave Resonator) as a resonant element to replace on-chip LC tanks in RF designs and present a range of new circuit designs to overcome above challenges. I will focus on two relevant projects from my Ph. D. dissertation: an ultra-low power analog phase-locked loop, a low power divider-less all-digital phase-locked loop. I will demonstrate the power efficiency gain resulting from high Q RF frequency synthesizers. Experimental results will be presented and exciting future opportunities in low power wireless applications will be discussed.