David S. Ricketts

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Symptomatic liquefaction and calcification of muscle tissue as a late sequela of compartment syndrome of the lower leg is rare. The literature shows a high complication rate involved with simple debridement of these compartments. In our limited experience, complete compartmental debridement and immediate introduction of functional viable muscle may prevent(More)
A 1 mm diameter, cylindrical, autonomous, modular robot has been designed; its manufacturing and assembly techniques have been developed; and its operation has been demonstrated. The robot, called a catom, is the first step towards realizing the basic unit of Claytronics, a modular robotic system designed to scale to millions of units. The catom is composed(More)
Macroelectronic circuits made on substrates of glass or plastic could one day make computing devices ubiquitous owing to their light weight, flexibility and low cost. But these substrates deform at high temperatures so, until now, only semiconductors such as organics and amorphous silicon could be used, leading to poor performance. Here we present the use(More)
We study and present design guidelines for thru-reflect-line vector-network-analyzer calibration kits used for characterizing circuits and transistors fabricated on silicon integrated circuits at millimeter-wave frequencies. We compare contact-pad designs and develop fixed-fill contacts that achieve both repeatable and low contact-pad capacitances. We(More)
As externally powered microsystems become more common, designers need better tools to understand power delivery systems such as non-resonant capacitive coupling. In this paper we present the first general method which allows a designer to easily model power delivery through capacitive coupling. The method uses a power iteration technique which allows one to(More)
A 2GS/s 6-bit flash sub-ADC with an op-amp free track-and-hold (T&H) for use in an 8GS/s 4-way time-interleaved ADC was implemented in 45nm SOI CMOS. The T&H utilizes a passive charge sharing technique and achieves a 4GHz input bandwidth at 2GS/s clock rate without an op-amp. The flash sub-ADC consumes 74mW at 2GS/s and occupies an area of(More)