University of Waterloo
200 University Ave W, Waterloo, ON
N2L 3G1
Phone: (519) 888-4567
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Jianian Tao
Design of Low Voltage Unsaturated Ring Oscillator for a Sigma Delta Time to Digital Converter
Bosco Leung
This thesis investigates the phase noise of two 2-stage cross-coupled pair unsaturated ring oscillators with no tail current source. One oscillator consists of top cross-coupled pair delay cells, and the other consists of top cross-coupled pair and bottom cross-coupled pair delay cells. Under a low supply voltage restriction, a phase noise model is developed and applied to both ring oscillators. Both top cross-coupled pair and top and bottom cross-coupled pair oscillators are fabricated with 0.13 um CMOS technology. Phase noise measurements of -92dBc/Hz and -89dBc/Hz, respectively, at 1Mhz offset is obtained from the chip, which agree with theory and simulations. Top cross-coupled ring oscillator, with phase noise of -92dBc/Hz at 1Mhz offset, is implemented in a second order sigma-delta time to digital converter. System level and transistor level functional simulation and timing jitter simulation are obtained.
University of Waterloo
200 University Ave W, Waterloo, ON
N2L 3G1
Phone: (519) 888-4567
Staff and Faculty Directory
Contact the Department of Electrical and Computer Engineering
The University of Waterloo acknowledges that much of our work takes place on the traditional territory of the Neutral, Anishinaabeg and Haudenosaunee peoples. Our main campus is situated on the Haldimand Tract, the land promised to the Six Nations that includes six miles on each side of the Grand River. Our active work toward reconciliation takes place across our campuses through research, learning, teaching, and community building, and is centralized within our Indigenous Initiatives Office.