This technical report releases a collection of ring oscillator experiments. Our first experimental chip, called The Duchess, gave us useful initial results. We followed it with a series of Duchess chips to measure values for other technologies as well as for other load conditions. Here one will find the designs, notes, experimental results, and conclusions from several of these experiments.

Moreover, this technical report reveals not only the experiments themselves, but also what we wrote about them at the time. These are the working documents we used as we developed the experiments. They reveal how our thinking evolved, what we left out of our initial efforts, and how we work. We recognize that some of the documents included here contain flaws; such flaws are a necessary part of an evolution of ideas.