Abstract:
A low voltage isolation circuit (1) is described inserted between a connection node (HVout) to a matrix (2) of switches suitable for receiving a high voltage signal (IM) and a connection terminal (pzt) to a load (PZ) suitable for transmitting said high voltage signal (IM) to said load (PZ) of the type comprising at least one driving block (5) inserted between a first and a second voltage reference (Vss, - Vss) and comprising at least a first driving transistor (M l), inserted, in series with a first driving diode (Dl), between the first voltage reference (Vss) and a first driving central circuit node (Xc) and a second driving transistor (M2), in turn inserted, in series with a second diode (D2), between the driving central circuit node (Xc) and the second supply voltage reference (-Vss). The switch comprises an isolation block (8) connected to the connection terminal (pzt), to the connection node (HVout) and to the driving central circuit node (Xc) and comprising at least one voltage limiter block (6), a diode block (7) and a control transistor (MD), in turn connected across the diode block (7) between the connection node (HVout) to the matrix (2) of switches and the connection terminal (pzt) to the load (PZ) of the low voltage isolation switch (1) and having a control terminal (XD) connected to the driving central circuit node (Xc).
Abstract:
An integrated magnetoresistive device, where a substrate (17) of semiconductor material is covered, on a first surface (19), by an insulating layer (18). A magnetoresistor (26) of ferromagnetic material extends in the insulating layer and defines a sensitivity plane of the sensor. A concentrator (34) of ferromagnetic material including at least one arm (34a), extending in a transversal direction to the sensitivity plane and vertically offset to the magnetoresistor (26). In this way, magnetic flux lines directed perpendicularly to the sensitivity plane are concentrated and deflected so as to generate magnetic-field components directed in a parallel direction to the sensitivity plane.
Abstract:
The invention relates to a security system comprising at least one integrated circuit (24a) and a transceiver / transponder circuit (30), the at least one integrated circuit (24a) being provided with an antenna (36) for communicating with the transceiver / transponder circuit (30), an inhibiting element (24b, 44, 44a, 44b) being associated with the at least one integrated circuit (24a) for inhibiting communications with the transceiver / transponder circuit (30) and for securing the data contained in the at least one integrated circuit (24a). Advantageously, the inhibiting element (24b, 44, 44a, 44b) is an electromagnetic inhibiting element, the security system further comprising a coupling element (22) that is associated with the antenna (36) of the at least one integrated circuit (24a) for temporarily deactivating the electromagnetic inhibiting element (24b, 44, 44a, 44b) to allow communications between the at least one integrated circuit (24a) and the transceiver / transponder circuit (30).
Abstract:
A transmission channel (1) is described comprising at least one high voltage buffer block (4) comprising buffer transistors (MB1, MB2, MB3, MB4) and respective buffer diodes (DB1, DB2, DB3, DB4), being inserted between respective voltage references (HVP0, HVP1, HVM0, HVM1), a clamping circuit (10) being connected to a first output terminal (HVout) of the transmission channel (1), an antinoise block (6) being connected between the first output terminal (HVout) and a connection terminal (Xdcr) of the transmission channel (1); as well as a switching circuit (30) being inserted between the connection terminal (Xdcr) and a second output terminal (LVout) of the transmission channel (1). Advantageously according to the invention, the clamping circuit (10) comprises a clamping core (11), a reset circuit (20) comprising diodes (DME1, DME2, DME3, DME4 ) inserted between circuit nodes (XME1, XME2, XME3, XME4, XC1, XC2) of the high voltage buffer block (4) and of the clamping circuit (10), the circuit nodes (XME1, XME2, XME3, XME4, XC1, XC2 ) being in correspondance with conduction terminals of said transistors (MB1,MB2,MB3,MB4,MC1,MC2) comprised into the high voltage buffer block(4) and into the clamping circuit (10), and a switching circuit (30).
Abstract:
A low voltage isolation circuit (1) is described inserted between an input terminal (HVout) suitable for receiving a high voltage signal (IM) and an output terminal (pzt) suitable for transmitting the high voltage signal (IM) to a load (PZ) of the type comprising at least one driving block (5) inserted between a first and a second voltage reference (Vss, -Vss) and comprising a first driving transistor (Ml), inserted between the first voltage reference (Vss) and a first driving central circuit node (Xc) and a second driving transistor (M2), in turn inserted between the driving central circuit node (Xc) and the second supply voltage reference (-Vss) as well as an isolation block (8) connected to the connection terminal (pzt), to the input terminal (HVout) and, through a protection block (9) comprising a first and a second protection transistor (MD1, MD2), being in anti-series to each other and having control terminals receiving respective complementary protection driving signals (dr1, dr2), to the driving central circuit node (Xc), the isolation block (8) comprising at least one voltage limiter block (6), a diode block (7) and a control transistor (MD), in turn connected across the diode block (7) between the input (HVout) and output (pzt) terminals of the low voltage isolation switch (1) and having a control terminal (XD) connected to the driving central circuit node (Xc) through the protection block (9), said diode block (7) comprising at least one first and one second transmission diode (DN1, DN2), connected in antiparallel, i.e. by having an anode terminal of said first diode connected to a cathode terminal of said second diode and vice versa.
Abstract:
The invention relates to a High Voltage switch configuration (10) having an input terminal (IN) which receives an input signal (Vin) to drive a load and an output terminal (OUT) which issues an output signal (Vout) to the load. Advantageously according to the invention, the High Voltage switch configuration ( 10) comprises at least a first and a second diode (D1, D2), being placed in antiseries between said input and output terminals (IN, OUT) and having a pair of corresponding terminals in common, in correspondence of a first internal circuit node (Xc1).
Abstract:
The present invention relates to a circuit architecture for the parallel supplying of power during an electric or electromagnetic testing, such as EMWS or EWS or WLBI testing, of a plurality of electronic devices (2) each integrated on a same semiconductor wafer (1) wherein the electronic devices (1) are neatly provided on the semiconductor wafer (1) through integration techniques and have edges (5) bounded by separation scribe lines (7). Advantageously according to the invention, the circuit architecture comprises: - at least one conductive grid (4), interconnecting at least one group of the electronic devices (2) and having a portion being external (14) to the devices of the group and a portion being internal (13) to the devices of the group; the external portion (14) of the conductive grid (4) being extended also along the separation scribe lines (7); the internal portion (13) being extended within at least a part of the devices of the group; interconnection pads (6) between the external portion (14) and the internal portion (13) of the conductive grid (4) being provided on at least a part of the devices of the group, the interconnection pads (6) forming, along with the internal and external portions, power supply lines which are common to different electronic devices (2) of the group.
Abstract:
In a reliable method and a relative circuit for monitoring the powering of a remote device through a LAN it is not necessary to generate an extra biasing voltage higher than the DC power supply voltage. As in known power distribution systems, the DC voltage used for supplying the remote device is applied to the LAN line and at the same time an AC voltage is applied to the same line for monitoring whether the remote device is connected or not to the LAN line. However, differently from prior techniques, the DC voltage is applied to a first or "high" terminal and the AC voltage is applied to the other or "low" terminal of the LAN line through a decoupling capacitor. This arrangement makes possible to supply the remote device with the largest possible DC voltage compatible with a fully integrated AC signal generator, disconnection detector and PSE controller and enhances the reliability of recognition of whether the powered device is connected to or disconnected from the LAN line.
Abstract:
An electrical circuit (1) for conversion from differential to single-ended is described, comprising: a differential amplifier stage (2) having a first (IN+) and a second (IN") input; a first (5) and a different second charging circuit (6) of the differential stage that can be operatively coupled, respectively, with an output (OUT*) of the conversion circuit (1) and with an auxiliary output (AUXOUT*). The circuit also comprises a first (7) and a second (8) buffer circuit each functionally arranged between one of said outputs\and between one of said charging circuits. The buffer circuits being configured so as to minimise a difference between the relative impedances seen towards said outputs (OUT*, AUXOUT*).
Abstract:
Herein described is a control device of a device for the correction of the power factor in forced switching power supplies; said device for the correction of the power factor comprises a converter (20) and said control device (1) is coupled to the converter to obtain from an alternating input line voltage (Vin) a regulated output voltage (Vout) . The control device (1) comprises generating means (421-423) associated to a capacitor (Cf f) for generating a signal (Vff) representative of the root-mean- square value of the alternating line voltage; the generating means (421-424) are associated to means for discharging (Rf f) said capacitor. The control device comprises further means for discharging (Ml, COMPl, Cl; Ml 6, COMPI 1, CI 1; M50, COMP22, C0MP33, Cint) the capacitor (Cf f) suitable for discharging said capacitor when the signal (Vff) representative of the root-mean- square value of the alternating line voltage goes below a given value (VCl, VCI 1, Vint) .