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PhD Final Oral Examination – Ankur Guha Roy


Monday, November 30, 2015 2:00 PM - 4:00 PM

Analysis and Design of Low Voltage LC Oscillators and their Application to Wireless Sensor Networks
Analysis, design optimization, and application of enhanced swing, low power CMOS LC oscillators is presented. A phasor analysis based approach for determining the amplitude and phase noise of these oscillators is used. MOSFET operation in cut-off, linear and saturation regions is included. The calculated steady state output amplitude and phase noise from this analysis are in agreement with Cadence Spectre simulations for different bias conditions. Application of this analysis to the design optimization of LC oscillators is demonstrated.

A power generation method based fast start-up analysis of resonator based oscillators is presented. The power generation analysis uses a small signal two-port based approach and is design oriented. Application of this analysis to the design optimization of oscillators for start-up time reduction is described.

A new enhanced swing class-D VCO which operates from a supply voltage as low as 300 mV is presented. Prototype differential and quadrature variants of the proposed VCO have been implemented in a 65 nm RF CMOS process with a 5 GHz VCO oscillation frequency. At a 350 mV supply, the measured phase noise performance for the quadrature VCO with a 5% tuning range is -137.1 dBc/Hz at 3 MHz offset with a power dissipation of 2.1 mW from a 0.35 V supply. The highest resulting figure-of-merit (FoM) is 198.3 dBc/Hz. Application of such an LC VCO for a crystal free radio-frequency (RF) receiver design is explored. Design trade-offs are considered using system level simulations.

Co-Major Advisor: Kartikeya Mayaram
Co-Major Advisor: Terri Fiez
Committee: Arun Natarajan
Committee: Matthew Johnston
GCR: David Hackleman


Kelley Engineering Center (campus map)
1007
Nicole Thompson
1 541 737 3617
Nicole.Thompson at oregonstate.edu
Sch Elect Engr/Comp Sci
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