Abstract: An optocoupler package made up from a pre-assembled package having a leadframe, a voltage isolation barrier, and a body molded from a reflective plastic material. The voltage isolation barrier is fabricated as part of the body and positioned in such a way as to substantially increase the electrical flashover path between the optical source and the optical detector. An optical source mounted in the pre-assembled package subsequent to fabrication of the molded body. An optical detector is optically coupled to the optical source by reflection within the pre-assembled package, the optical detector being mounted in the pre-assembled package subsequent to fabrication of the molded body A reflective plastic cover is bonded to the pre-assembled package.
Abstract: An environmental chamber for a transmission electron microscope, in which a specimen is held in position within the transmission electron microscope so an electron beam passes through the specimen to a detector. A removable sleeve surrounds the specimen holder and is sealed at both ends by a seal between the removable sleeve and the specimen holder to form a differential pressure chamber. Apertures are formed in the removable sleeve allowing the electron beam to pass through the specimen to the detector. A vacuum line allows gases to be removed from the differential chamber. A reactive inlet line extends into the differential chamber to allow a material to be introduced onto the specimen.
Abstract: Optimization of test stimulus verification by analyzing test stimulus timing information against restriction rules derived from a static analysis of a digital system. The result of this analysis is used to determine test stimulus timing which cannot cause a timing violation and to remove the associated vectors from further checking. Only those vectors which can violate timing constraint rules are checked individually to find states which violate the timing rules.