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    AMPLIFICATION STEP PROTECTIVE CIRCUIT
    2.
    发明专利
    AMPLIFICATION STEP PROTECTIVE CIRCUIT 失效

    公开(公告)号：JPH07273563A

    公开(公告)日：1995-10-20

    申请号：JP32798494

    申请日：1994-12-28

    Applicant: ST MICROELECTRONICS SRL

    Inventor： TAVAZZANI CLAUDIO ,  FASSINA ANDREA ,  STEFANI FABRIZIO

    IPC: H03F1/30 ,  H03F1/52

    Abstract: PURPOSE: To obtain the amplification state protecting circuit which is reduced in the total number of circuit elements, specially, sense circuits and therefore improved in the reliability of protection and decreased in the integration area of the circuit. CONSTITUTION: This circuit is provided with a circuit switching means G which is piloted by a logic OR gate F by a monostable M and generates a turn-on command signal with predetermined continuation duration in case of an abnormal operating conditions. After a sense circuit B which senses an abnormal state at a start or in the normal operation enables an AND gate H, a turn-off signal is sent through the OR gate. The signal of the AND gate arrives as a confirmation signal through an OR logic gate C from a window comparator A coupled with an amplification stage start member, a monostable flip-flop, and the output terminal of the AND gate H.

    4.
    发明专利
    未知

    公开(公告)号：DE69320974T2

    公开(公告)日：1999-02-04

    申请号：DE69320974

    申请日：1993-12-31

    Applicant: ST MICROELECTRONICS SRL

    Inventor： TAVAZZANI CLAUDIO ,  FASSINA ANDREA ,  STEFANI FABRIZIO

    IPC: H03F1/30 ,  H03F1/52

    Abstract: Circuit for protection of an amplifier stage comprising circuit switching means (G) for turn-off of the stage and piloted through a logic gate OR (F) by a monostable (M), which generates upon arise of abnormal operating conditions turn-off command signals having a predetermined duration. A sensing circuit (B) upon persistence of abnormal conditions at start-up or during normal operation also sends turn-off signals through the logic gate OR (F) after enablement through a gate AND (H). The signals of any enablement at the logic gate AND arrive through a logic gate OR (C) from a window comparator (A) coupled with stage start-up members, from the monostable, and from the output of said logic gate AND (H) as a confirmation signal.

    5.
    发明专利
    未知

    公开(公告)号：DE69320974D1

    公开(公告)日：1998-10-15

    申请号：DE69320974

    申请日：1993-12-31

    Applicant: ST MICROELECTRONICS SRL

    Inventor： TAVAZZANI CLAUDIO ,  FASSINA ANDREA ,  STEFANI FABRIZIO

    IPC: H03F1/30 ,  H03F1/52

    Abstract: Circuit for protection of an amplifier stage comprising circuit switching means (G) for turn-off of the stage and piloted through a logic gate OR (F) by a monostable (M), which generates upon arise of abnormal operating conditions turn-off command signals having a predetermined duration. A sensing circuit (B) upon persistence of abnormal conditions at start-up or during normal operation also sends turn-off signals through the logic gate OR (F) after enablement through a gate AND (H). The signals of any enablement at the logic gate AND arrive through a logic gate OR (C) from a window comparator (A) coupled with stage start-up members, from the monostable, and from the output of said logic gate AND (H) as a confirmation signal.

    6.
    发明专利
    未知

    公开(公告)号：DE69926728T2

    公开(公告)日：2006-05-18

    申请号：DE69926728

    申请日：1999-04-27

    Applicant: ST MICROELECTRONICS SRL

    Inventor： MASINI MARCO ,  TAVAZZANI CLAUDIO

    IPC: H03F3/217 ,  H03G11/00 ,  H03G11/04

    Abstract: A way of establishing a constant limit duty-cycle, substantially independent from fabrication process spread, temperature, etc., and to guarantee an optimal functioning of the final stage of the amplifier for all working conditions consists in detecting the equivalent values of the voltages to which the output signal of the amplifier switches (or pseudo supplies): VDD' and -VDD", respectively, and in making the limiting stage of the voltage swing of analog input signal utilize such pseudo supply values VDD' and -VDD" as respective reference values in limiting the voltage excursion of the analog signal VL output by the input limiting stage to a pre-defined fraction alpha

    8.
    发明专利
    未知

    公开(公告)号：DE69926728D1

    公开(公告)日：2005-09-22

    申请号：DE69926728

    申请日：1999-04-27

    Applicant: ST MICROELECTRONICS SRL

    Inventor： MASINI MARCO ,  TAVAZZANI CLAUDIO

    IPC: H03F3/217 ,  H03G11/00 ,  H03G11/04

    Abstract: A way of establishing a constant limit duty-cycle, substantially independent from fabrication process spread, temperature, etc., and to guarantee an optimal functioning of the final stage of the amplifier for all working conditions consists in detecting the equivalent values of the voltages to which the output signal of the amplifier switches (or pseudo supplies): VDD' and -VDD", respectively, and in making the limiting stage of the voltage swing of analog input signal utilize such pseudo supply values VDD' and -VDD" as respective reference values in limiting the voltage excursion of the analog signal VL output by the input limiting stage to a pre-defined fraction alpha

    9.
    发明专利
    未知

    公开(公告)号：DE69727934D1

    公开(公告)日：2004-04-08

    申请号：DE69727934

    申请日：1997-10-31

    Applicant: ST MICROELECTRONICS SRL

    Inventor： CHIOZZI GIORGIO ,  TAVAZZANI CLAUDIO

    IPC: H03F3/72 ,  H03F1/00

    Abstract: An integrated power operational amplifier can alternatively be operated in a master or a slave mode, such that a master amplifier can be connected in parallel with one or more slave amplifiers. This arrangement allows very low impedance loads to be driven, as well the heat dissipation to be distributed over a number of devices, thereby raising the maximum dissipation limits of integrated power systems. In addition, by eliminating the ballast resistors, more power can be delivered by the system, for the same supply voltage, and less power dissipated.

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