A 1.5nW, 32.768kHz XTAL Oscillator Operational from 0.3V Supply

A. Shrivastava, Akella, D., and Calhoun, B. H., “A 1.5nW, 32.768kHz XTAL Oscillator Operational from 0.3V Supply”, IEEE Journal of Solid-State Circuits (JSSC), vol. 51, 2016.