A single-ended to differential converter uses a cross-coupled latch that maximizes the output zero-crossing symmetry and is self compensating over PVT variations. The system includes a first semiconductor die containing the integrated circuit, and a second semiconductor die containing the microstrip transmission line. The method further includes determining the progress of each animation. The engaging protrusion section and the engaging hole section are formed on the end surface of the gas path cap which is provided in the gas path plug section of the gas path plug and closes the through hole. The time period of production of the respective negative films is specified by reading a code number recorded on the negative films, and information J including datetime information representing the time period is obtained. Should the communication session degrade, rather than dropping the communication session the user of a device communicating with the mobile device is prompted to wait while an attempt is made to improve the quality of the communication session.