Abstract: Electrostatic discharge protection device comprising a first highly p-doped region with a base contact, a first highly n-doped region with a collector contact, a second highly n-doped region with an emitter contact and located between the first highly p-doped region and the second highly n-doped region, the first highly p-doped region and the second highly n-doped region being applied in a weakly p-doped region which a has a lateral overlap extending towards the first highly n-doped region, the lateral overlap having a width, the first highly n-doped region being applied in a weakly n-doped region, the weakly p-doped region and the weakly n-doped region being applied in a more weakly n-doped region, and a highly n-doped buried layer located underneath the more weakly n-doped region and extending below at least a portion of the weakly n-doped region and at least a portion of the weakly p-doped region.

Abstract: A main pulse train at a main frequency and at least two derived pulse tra at submultiples of the main frequency are transmitted over a transmission path, from a transmitter to a receiver, in the form of pulses of alternating polarity. A first one of the derived pulse trains is transmitted as a single violation of bipolarity in the main pulse train while a second one of the derived pulse trains is transmitted as two successive violations of bipolarity in the main pulse train. The system is applicable to multiple synchronization (bit, frame etc . . . ) in a PCM digital transmission or switching system.

Abstract: The invention concerns a position measuring device used for measuring the sition of a vessel equipped with three hydrophones arranged at the apexes of a right-angled triangle in relation to a transmitting beacon on the sea bed. Measuring of the differences in the travel time between the beacon and the various hydrophones as well as of the depth of the water and analogic calculating of the position of the vessel in a simple way and without approximation.