A Bandpass ΔΣ DDFS-Driven 19GHz Frequency Synthesizer for FMCW Automotive Radar. - Hoon Hee Chung; Umar Lyles; Tino Copani; Bertan Bakkaloglu; Sayfe Kiaei (ISSCC, 2007)

An Injection-Locked Frequency-Tracking Σ∆ Direct Digital Frequency Synthesizer. - Umar Lyles; Tino Copani; Bertan Bakkaloglu; Sayfe Kiaei (IEEE Trans. Circuits Syst. II Express Briefs, 2007)

A 330nA energy-harvesting charger with battery management for solar and thermoelectric energy harvesting. - Karthik Kadirvel; Yogesh K. Ramadass; Umar Lyles; John Carpenter; Vadim Ivanov; Vince McNeil; Anantha P. Chandrakasan; Brian Lum-Shue-Chan (ISSCC, 2012)