Abstract: A system includes a differential clock source configured to provide a reference clock signal and an inverted version of the reference clock signal. The system also includes a quadrature clock source configured to provide a quadrature clock signal that is phase-shifted relative to the reference clock signal. The system also includes a differential sensing circuit coupled to the differential clock source and the quadrature clock source. The differential sensing circuit is configured to determine skew of the quadrature clock signal based on the reference clock signal, the inverted version of the reference clock signal, and the quadrature clock signal.

Abstract: A system includes a differential clock source configured to provide a reference clock signal and an inverted version of the reference clock signal. The system also includes a quadrature clock source configured to provide a quadrature clock signal that is phase-shifted relative to the reference clock signal. The system also includes a differential sensing circuit coupled to the differential clock source and the quadrature clock source. The differential sensing circuit is configured to determine skew of the quadrature clock signal based on the reference clock signal, the inverted version of the reference clock signal, and the quadrature clock signal.

Abstract: In general, the knowledge base table composer embodiments described herein provide table answers to keyword queries against one or more knowledge bases. Highly relevant patterns in a knowledge base are found for user-given keyword queries. These patterns are used to compose table answers. To this end, a knowledge base is modeled as a directed graph called a knowledge graph, where nodes represent entities in the knowledge base and edges represent the relationships among them. Each node/edge is labeled with a type and text. A pattern that is an aggregation of subtrees which contain all keywords in the texts and have the same structure and types on node/edges is sought. Patterns that are relevant to a query for a class can be found using a set of scoring functions. Furthermore, path-based indexes and various query-processing procedures can be employed to speed up processing.