公开(公告)号：IT1245421B

公开(公告)日：1994-09-20

申请号：ITTO910137

申请日：1991-02-27

Applicant: SGS THOMSON MICROELECTRONICS

Inventor： POLETTO VANNI ,  MORELLI MARCO ,  MURARI BRUNO

IPC: G05F1/56 ,  G05F1/569 ,  G05F1/59 ,  H02J9/06 ,  G05F

Abstract: A voltage regulator (30) comprising a first power switch (16) connected between the input terminal (11) and output terminal (13); a storage condenser (21) connected to the input terminal via a one-way switch (18); a second power switch (19) connected between the condenser and the input terminal; and a regulating element (17) connected to the output terminal and driving the power switches (16, 19) in such a manner as to maintain the output voltage (Vo) constant. For better distributing electric and thermal stress and improving the reliability and working life of the regulator by reducing the interference caused by switching of the two power switches, a drive device (31) is provided between the regulating element (17) and the switches (16, 19), for detecting the input voltage (VA) and the voltage of the condenser (VA'), and keeping both switches on as long as the input voltage is above two given thresholds (VTH1, VTH2), turning off the second switch (19) when the input voltage is higher than the condenser voltage (VA > VA') and below the first threshold (VA

公开(公告)号：DE3783219D1

公开(公告)日：1993-02-04

申请号：DE3783219

申请日：1987-10-13

Applicant: SGS THOMSON MICROELECTRONICS

Inventor： SILIGONI MARCO ,  POLETTO VANNI

IPC: H04M19/00

Abstract: A Subscriber Line Interface Circuit (SLIC) having a voltage regulator (5) for application thereto of a DC supply voltage VB and connected at the output terminals to an audio transmission line (3,4) to provide a line current IL and voltage VL for a given resistance load RL on the line, is provided with a control circuit (2) which, by picking up appropriate current and voltage values from the interface circuit, outputs a voltage value which is the equal of the difference between an optimum supply voltage VBF and the supply voltage VB. The control circuit (2) output is connected to the voltage regulator (5) to minimize the voltage VBFK applied to the interface circuit (1) as the transmission line (3,4) resistance load RL varies, thus minimizing the power dissipated through the interface circuit.

公开(公告)号：DE4142468A1

公开(公告)日：1992-10-29

申请号：DE4142468

申请日：1991-12-20

Applicant: SGS THOMSON MICROELECTRONICS

Inventor： POLETTO VANNI ,  BRAMBILLA MASSIMILIANO

IPC: G05F3/26 ,  G05F1/46 ,  G05F3/30

Abstract: The generator comprises a first generator of voltage with thermal drift of zero, a second generator of voltage with given thermal drift, first means for applying a given load to the voltage generated by the first generator, second means for applying a given load to the voltage generated by the second generator, subtracting means for subtracting one from the other the loaded voltages generated by said first and second generator of voltage.

公开(公告)号：IT9022470A1

公开(公告)日：1992-06-22

申请号：IT2247090

申请日：1990-12-21

Applicant: SGS THOMSON MICROELECTRONICS

Inventor： BRAMBILLA MASSIMILIANO ,  POLETTO VANNI

IPC: G05F3/26 ,  G05F1/46 ,  G05F3/30 ,  H02J20060101

公开(公告)号：IT1250824B

公开(公告)日：1995-04-21

申请号：ITTO910598

申请日：1991-07-29

Applicant: SGS THOMSON MICROELECTRINCS S ,  MARELLI AUTRONICA

Inventor： MAZZUCCO MICHELANGELO ,  POLETTO VANNI ,  MORELLI MARCO

IPC: G01N27/409 ,  H03F1/08 ,  H03F3/34 ,  H03F3/347 ,  H03F3/45 ,  H03F

公开(公告)号：ITTO910598D0

公开(公告)日：1991-07-29

申请号：ITTO910598

申请日：1991-07-29

Applicant: SGS THOMSON MICROELECTRINCS S ,  MARELLI AUTRONICA ,  MARELLI SUTRONICA S P A

Inventor： MAZZUCCO MICHELANGELO ,  POLETTO VANNI ,  MORELLI MARCO

IPC: G01N27/409 ,  H03F1/08 ,  H03F3/34 ,  H03F3/347 ,  H03F3/45

公开(公告)号：IT1250825B

公开(公告)日：1995-04-21

申请号：ITTO910599

申请日：1991-07-29

Applicant: ST MICROELECTRONICS SRL ,  MARELLI AUTRONICA

Inventor： MAZZUCCO MICHELANGELO ,  POLETTO VANNI ,  MORELLI MARCO

IPC: G01N27/409 ,  H03F3/45 ,  H03F

Abstract: In order to achieve a high input dynamic range as well as high CMRR and PSRR values and input impedance with the use of a single supply voltage (Vcc), the amplifier includes an input stage with two transistors (Q1, Q2) which are biased by a constant current (IP3, IP4), preferably of less than 1 microampere, and the collectors of the transistors (Q1, Q2) are kept at fixed reference voltages (VR1, VR2). The input signal (VIN) applied between the emitters (IN(-), IN(+)) of the transistors (Q1, Q2) is transferred to the terminals of a first resistor (R1) which is supplied with current (IR1) from a circuit (M7, A5, R3; M10, Q6, R4; M9, Q7, R5) which mirrors the current (IR1) into a second resistor (R6), from the terminals of which the output signal (VOUT) is taken. The preferred application is for forming interfaces for lambda probes fitted to catalytic converters for motor vehicles.

公开(公告)号：IT1251205B

公开(公告)日：1995-05-04

申请号：ITTO910707

申请日：1991-09-18

Applicant: ST MICROELECTRONICS SRL ,  MARELLI AUTRONICA

Inventor： POLETTO VANNI ,  MORELLI MARCO ,  POMA ALBERTO

IPC: H03K17/08 ,  H02M1/00 ,  H02M1/38 ,  H03K17/082 ,  H03K17/66 ,  H03K

Abstract: The circuit includes two output terminals (OUT1, OUT2) for connection to the terminals of a load (L), first and second pairs of electronic power switches (Q1, Q4; Q2, Q3) which are connected between the output terminals (OUT1, OUT2) and the two poles of a direct-current voltage supply (Vs) so as to form an H-shaped structure with the load (L), and a driver circuit (C1, C2) for selectively making the electronic power switches of the first pair (Q1, Q4) of the second pair (Q2, Q3) order to cause a current to flow through the load (L) in one direction or the other respectively, and for preventing the electronic switches (Q1, Q3; Q2, Q4) which are connected between the same output terminal (OUT1; OUT2) and the two poles of the voltage supply (Vs) from conducting simultaneously.