Abstract:
A semiconductor device including an electronic component and an edge region delimited by a side surface. The device is formed in a substrate of semiconductor material overlaid by a plurality of superficial layers which form, on top of the edge region, a stack of insulating layers. A first groove extends in the stack of insulating layers near the electronic component. A second groove extends in the stack of insulating layers between the first groove and the side surface and operates as an element of mechanical decoupling which blocks any possible delayering of the superficial layers during cutting of the wafer.
Abstract:
Herein described is a device for driving electric motors comprising a power stage with a variable duty-cycle coupled to a supply voltage. The power stage is suitable for driving the electric motor. The driving device comprises a circuit that is capable of raising the value of the input voltage of the power stage above the induced counter electromotive voltage of the motor in certain periods of time and a control device capable of activating said circuit in reply to values of the induced counter electromotive voltage greater than or comparable with the supply voltage.
Abstract:
The method of a protection circuit includes a reference voltage source and at least one circuit which are connected together via a switch. A memory element is connected to the input of the circuit, downstream of the switch. The switch is temporarily opened by a control signal generated by a monostable circuit when detecting switching of power elements belonging to an electronic device embedding the protection circuit. When the switch is open, the memory element supplies the circuit with the reference voltage previously stored. In this way, switching of the power element that might cause noise on the reference voltage cannot disturb the circuit and thereby cannot cause a faulty operation of the latter.
Abstract:
The gyroscope is formed by a driving system including a driving mass having an open concave shape; an accelerometer including a sensing mass and comprising mobile sensing electrodes; a linkage connecting the driving mass to the sensing mass. The sensing mass is surrounded on three sides by the driving mass and has a peripheral portion not facing the sensing mass. The mobile sensing electrodes extend integral with the sensing mass from the peripheral portion not facing the driving mass and are interleaved with fixed sensing electrodes. Thereby, there are no passing electrical connections extending below the sensing mass. Moreover the linkage includes springs placed equidistant from the center of gravity of the accelerometer, and the gyroscope is anchored to the substrate with anchoring springs placed equidistant from the center of gravity of the assembly formed by the driving system and by the accelerometer.
Abstract:
A process and a system is described for generating an MPEG output bitstream starting from an MPEG input bitstream. The output bitstream has a resolution modified with respect to the resolution of the input bitstream. -In the input bitstream, first portions that substantially do not affect and second portions that do affect resolution variation are distinguished. The second portions are then subjected to a function of modification of the resolution obtained by filtering the second portions in a domain of the discrete cosine transform, and then are transferred to the output bitstream. A corresponding computer program product is also provided.
Abstract:
A random access memory (RAM) includes at least two memory banks. Each memory bank includes an array of dynamic random access memory (DRAM) cells, and self-refresh circuits for continuously submitting the DRAM cells to a refresh operation independent of the other memory banks. A first circuit selectively accesses one of the memory banks in response to an external access request. A second circuit suspends the refresh operation in the accessed memory bank while processing the external access request, and while the refresh operations in non-selected memory banks are not suspended.
Abstract:
A variable charge pump contains several individual simple charge pumps, each with a pumping capacitor and a switching mechanism. Additionally, a switching network is coupled to the individual charge pumps so that the different lines in the charge pump can be connected together in a serial mode or parallel mode (or mixed serial and parallel modes) to match the needs of the output load. The switching network is easily changed to provide the necessary driving capability as the needs of the output load changes.
Abstract:
A system-on-chip (SOC) includes a power down circuit. Within the SOC are several circuit blocks, each of them operating responsive to a local clock signal. A system clock is coupled to the circuit blocks for providing a system clock signal that functions as the local clock signal for selected circuit blocks. A power control manager provides a signal that at least partially determines whether the system clock will act as the local clock for some of the circuit blocks. Within the circuit blocks is a shutdown circuit that selectively prevents the system clock signal from functioning as the local clock signal in those circuit blocks that receive the shutdown signal, but the shutdown circuit only operates after both the signal to shutdown is received from the power control manager and after the circuit block has, in fact, shutdown.
Abstract:
A variable gain amplifier is described which comprises a first device to which a first control signal (Vc, Vc1) is applied so that the gain (Ai1, Ai) of an output signal (iout, io) of the first device (11, 22, Q45-Q48) with respect to a first input signal (in, i1, ir) is a function of the exponential type of the first control signal (Vc, Vc1). The amplifier comprises a feedback network (25, Q51-Q58) connected between an output terminal and an input terminal of the first device (22, Q45-Q48) so as to assure that the gain (Ai) in decibel of the first device (22, Q45-Q48) is a linear function of the first control signal (Vc1). (FIG. 2)
Abstract:
An electrically-modifiable, non-volatile, semiconductor memory comprising a plurality of user memory locations which can be addressed individually from outside the memory in order to read and to modify the data held therein is characterized in that, for each user memory location, there is a corresponding pair of physical memory locations in the memory, which assume, alternatively, the functions of an active memory location and of a non-active memory location, the active memory location containing a previously-written datum and the non-active memory location being available for the writing of a new datum to replace the previously-written datum, so that, upon a request to replace the previous datum with the new datum, the previous datum is kept in the memory until the new datum has been written.