Joost van Beek
Senior Principal Scientist, NXP Semiconductors
September 24, 2013 | 12:30 to 01:30 | 521 Cory Hall, Hogan Room
Host: John Huggins
After a brief introduction on NXP Semiconductors, this presentation will describe a frequency synthesizer using a MEMS resonator as the frequency referencing element. Uniquely, the piezo-resistive properties of silicon are exploited to read out the resonator, resulting in low impedance levels at resonance frequencies up to several 100MHz. A 55MHz MEMS oscillator with a phase noise of -128dBc/Hz @ 1kHz offset and a -140dBc/Hz noise floor has been realized. The oscillator is combined with a programmable PLL to realize a complete frequency synthesizer that can generate output frequencies ranging from 25MHz to 200MHz. It achieves ±20ppm frequency accuracy over temperatures ranging from -20°C to +85°C, and draws 15mA from a 2.5V supply at an output frequency of 25MHz.
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