Abstract: A movement detection device, intended particularly for a computer mouse or a hand-held scanner, includes a light source (7) associated with a prism (8) having a non-uniformly plane reflective face. One thus obtains an as uniform as possible illumination of the field (4) of the object whose movements will be detected. An optical system (9) inserted between the field and the optoelectronic sensor (13) fixed to a printed circuit board (6) is mounted on a support (12) fixed to the board.

Abstract: A semiconductor circuit is disclosed that contains test hardware or test software (or both) that allows test functions to be executed directly from the memory of the semiconductor circuit. A remote testing station can issue a command indicating a specific test function that should be implemented. The disclosed semiconductor circuit independently performs the indicated test and provides the results to the test station. For an exemplary memory test, the test hardware and test software are employed to initially clear the memory and thereafter selectively apply a pattern to memory and read the applied pattern from each address to confirm that the correct pattern has been stored. The testing technique of the present invention reduces the number of pins that must be contacted by the tester, such as the address pins. In addition, the reduced number of contact points allows a number of semiconductor circuits to be setup and tested in parallel using the same automated test equipment (ATE).

Abstract: An active rectifier used in a power supply circuit comprises a diode (4) connected between in input terminal (9) and an output terminal (8). A transistor (2) is formed in a substrate (50) and has a control electrode (5) and two conductive electrodes (6,7) which are respectively connected to the input terminal (9) and the output terminal (8). A comparator (3) is supplied by the power supply circuit and has two inputs (+, -) connected to the input (9) and the output (8) terminals respectively, and an output connected to the transistor control electrode (5).