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    31.
    发明专利
    未知

    公开(公告)号：ITTO910137D0

    公开(公告)日：1991-02-27

    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

    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

    35.
    发明专利
    未知

    公开(公告)号：DE69025497T2

    公开(公告)日：1996-08-22

    申请号：DE69025497

    申请日：1990-05-08

    Applicant: SGS THOMSON MICROELECTRONICS

    Inventor： POLETTO VANNI

    IPC: H03F1/02 ,  H03F3/30

    Abstract: A bias current source for the output stage (18) of an operational amplifier (10) is controllable. The bias current generator (20) senses the voltage differential on the differential operational amplifier inputs. When an input differential voltage is sensed which generates a rising output signal, additional bias current is provided to the output stage (18). When the output voltage is constant or falling, the bias current to the output stage is decreased.

    36.
    发明专利
    未知

    公开(公告)号：DE3887916T2

    公开(公告)日：1994-08-04

    申请号：DE3887916

    申请日：1988-04-13

    Applicant: SGS THOMSON MICROELECTRONICS

    Inventor： MAZZUCCO MICHELANGELO ,  POLETTO VANNI ,  SILIGONI MARCO

    IPC: H03G9/00 ,  H03F1/30 ,  H03F3/45 ,  H03G1/04 ,  H03G5/18 ,  H03G5/00 ,  H03H11/12

    Abstract: A circuit for automatically controlling the gain-bandwidth product of operational amplifiers (M1-Mn), wherein gain-bandwidth product (G*B) of one of the amplifiers placed on the same chip as the amplifiers to be controlled is measured and the resulting signal is used to control through a bias circuit (CP) the gain-bandwidth products of all the amplifiers, the value of these products being presettable through the frequency of a control signal sent to the circuit input (1). The reference amplifier is highly compensated and placed in the configuration of voltage follower.

    37.
    发明专利
    未知

    公开(公告)号：DE3887916D1

    公开(公告)日：1994-03-31

    申请号：DE3887916

    申请日：1988-04-13

    Applicant: CSELT CENTRO STUDI LAB TELECOM ,  SGS THOMSON MICROELECTRONICS

    Inventor： MAZZUCCO MICHELANGELO ,  POLETTO VANNI ,  SILIGONI MARCO

    IPC: H03G9/00 ,  H03F1/30 ,  H03F3/45 ,  H03G1/04 ,  H03G5/18 ,  H03G5/00 ,  H03H11/12

    Abstract: A circuit for automatically controlling the gain-bandwidth product of operational amplifiers (M1-Mn), wherein gain-bandwidth product (G*B) of one of the amplifiers placed on the same chip as the amplifiers to be controlled is measured and the resulting signal is used to control through a bias circuit (CP) the gain-bandwidth products of all the amplifiers, the value of these products being presettable through the frequency of a control signal sent to the circuit input (1). The reference amplifier is highly compensated and placed in the configuration of voltage follower.

    38.
    发明专利
    未知

    公开(公告)号：DE3783219T2

    公开(公告)日：1993-07-01

    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.

    39.
    发明专利
    未知

    公开(公告)号：DE3880538D1

    公开(公告)日：1993-06-03

    申请号：DE3880538

    申请日：1988-03-14

    Applicant: SGS THOMSON MICROELECTRONICS

    Inventor： POLETTO VANNI

    IPC: H04Q3/42 ,  H04M19/00 ,  H04Q1/28

    Abstract: A so-called switching voltage regulator (1) for an interface circuit (16) in a telephone subscriber line, being of a type adapted to control the on/off states of an electronic switch (SW), connected to the interface circuit (16) and consisting of first (T1) and second (T2) transistors interconnected into a Darlington arrangement, comprises an ON-state sensor (14) connected input-wise to the collector (C1) of the first transistor (T1) and an OFF-state sensor (12) connected input-wise to the base (B1) of the first transistor (T1), and a pair of current extractor devices (11,10) respectively associated with the related bases (B1,B2) of the first (T1) and second (T2) transistors. Also provided are first (A1) and second (A2) current sources, each connected to a corresponding current amplifier (8,9) and a third hold current source (A3), the first (8) of such amplifiers powering both current extractor devices (11,10) and the second amplifier (9) and third current source (A3) being connected to the base (B2) of the second transistor (T2), as well as first (7) and second (5) dual input logic AND gates, the first gate (7) having an input (H) associated with the output of the OFF-state sensor (12) via a storage cell (6), and the second gate (5) having an input (Y) associated with the output of the ON-state sensor (14) via a further storage cell (4); each amplifier is respectively tied operatively with the outputs (U1,U2) of the first (7) and second (5) logic gates, each gate receiving on the other input (K,J) an appropriate enable signal from the regulator (1), whereas the hold current source (A3) is operatively tied directly with the enable signal of the second logic gate (5). Such a regulator (1) can minimize the current draw from the high tension power supply (-50 Volts) and make the on and off turning of the electronic switch (SW), including the pair of transistors (T1,T2) connected to the telephone subscriber line, faster.

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