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    1.
    发明专利
    未知

    公开(公告)号：DE69901781D1

    公开(公告)日：2002-07-18

    申请号：DE69901781

    申请日：1999-03-05

    Applicant: ST MICROELECTRONICS SRL

    Inventor： PISATI VALERIO ,  PORTALURI SALVATORE ,  SAVO ALESSANDRO ,  MARCHESE STEFANO

    IPC: H03G1/00

    Abstract: A programmable-gain multistage amplifier with broad bandwidth and reduced phase variations, comprising a differential input stage which is biased by a first current source and to which a differential voltage signal is fed, the stage being connected to a pair of diodes in which the cathode terminals are connected to respective bipolar transistors, which are biased by a second current source and in which the collector terminals are connected to load resistors, the differential output of the amplifier being provided at the collector terminals of the bipolar transistors, characterized in that it comprises two circuit branches, each of which is constituted by a bipolar transistor and by a third current source, which is respectively connected to the collector terminal and emitter terminal of the bipolar transistor, in which the base terminal receives the differential voltage signal and the collector terminal is connected to the cathode terminal of a respective one of the two diodes, the circuit branches being mutually connected by means of a pair of capacitors.

    2.
    发明专利
    未知

    公开(公告)号：IT1313390B1

    公开(公告)日：2002-07-23

    申请号：ITVA990020

    申请日：1999-07-16

    Applicant: ST MICROELECTRONICS SRL

    Inventor： DEMICHELI MARCO ,  BOLLATI GIACOMINO ,  DEMICHELI DAVIDE ,  MARCHESE STEFANO

    IPC: G11B20/10

    Abstract: A method is provided for defining programmed values of the boost and cut-off frequency parameters of a low pass filter of pre-equalization, of a read channel for a magnetic medium mass memory device, to ensure optimal functioning conditions of the adaptive filter of final equalization. The method includes pre-programming instantaneous digital values of the boost and cut-off frequency parameters of the low pass filter of pre-equalization for each magnetic medium, as a function of purposely sensed instantaneous operating parameters of the adaptive filter that carries out the definitive equalization of the signal during a trim scanning of the magnetic medium.

    3.
    发明专利
    未知

    公开(公告)号：DE69520673T2

    公开(公告)日：2001-08-02

    申请号：DE69520673

    申请日：1995-09-27

    Applicant: ST MICROELECTRONICS SRL

    Inventor： GERNA DANILO ,  PASOTTI MARCO ,  MARCHESE STEFANO

    IPC: G11C27/00 ,  G11C27/02

    Abstract: The speed of a capacitive cell RAAM used for storing an optical image as electric charge is greatly enhanced by presampling the serial analog input signal on two rows or lines of presampling capacitors, each composed of the same number of capacitors as the number of columns of the capacitive cell RAAM and by "writing" in a parallel mode the selected row of said memory. The values stored in the capacitors of one of said two presampling rows are transferred (written) in the corresponding cells of the selected row of the memory while presampling continues on the other row of presampling capacitors.

    5.
    发明专利
    未知

    公开(公告)号：IT1309712B1

    公开(公告)日：2002-01-30

    申请号：ITMI990350

    申请日：1999-02-19

    Applicant: ST MICROELECTRONICS SRL

    Inventor： PISATI VALERIO ,  PORTALURI SALVATORE ,  MARCHESE STEFANO ,  SAVO ALESSANDRO

    IPC: H03G1/00

    Abstract: A programmable-gain multistage amplifier with broad bandwidth and reduced phase variations, comprising a differential input stage which is biased by a first current source and to which a differential voltage signal is fed, the stage being connected to a pair of diodes in which the cathode terminals are connected to respective bipolar transistors, which are biased by a second current source and in which the collector terminals are connected to load resistors, the differential output of the amplifier being provided at the collector terminals of the bipolar transistors, characterized in that it comprises two circuit branches, each of which is constituted by a bipolar transistor and by a third current source, which is respectively connected to the collector terminal and emitter terminal of the bipolar transistor, in which the base terminal receives the differential voltage signal and the collector terminal is connected to the cathode terminal of a respective one of the two diodes, the circuit branches being mutually connected by means of a pair of capacitors.

    6.
    发明专利
    未知

    公开(公告)号：DE69520673D1

    公开(公告)日：2001-05-17

    申请号：DE69520673

    申请日：1995-09-27

    Applicant: ST MICROELECTRONICS SRL

    Inventor： GERNA DANILO ,  PASOTTI MARCO ,  MARCHESE STEFANO

    IPC: G11C27/00 ,  G11C27/02

    Abstract: The speed of a capacitive cell RAAM used for storing an optical image as electric charge is greatly enhanced by presampling the serial analog input signal on two rows or lines of presampling capacitors, each composed of the same number of capacitors as the number of columns of the capacitive cell RAAM and by "writing" in a parallel mode the selected row of said memory. The values stored in the capacitors of one of said two presampling rows are transferred (written) in the corresponding cells of the selected row of the memory while presampling continues on the other row of presampling capacitors.

    7.
    发明专利
    未知

    公开(公告)号：ITVA990020D0

    公开(公告)日：1999-07-16

    申请号：ITVA990020

    申请日：1999-07-16

    Applicant: ST MICROELECTRONICS SRL

    Inventor： DEMICHELI MARCO ,  BOLLATI GIACOMINO ,  DEMICHELI DAVIDE ,  MARCHESE STEFANO

    IPC: G11B20/10

    Abstract: A method is provided for defining programmed values of the boost and cut-off frequency parameters of a low pass filter of pre-equalization, of a read channel for a magnetic medium mass memory device, to ensure optimal functioning conditions of the adaptive filter of final equalization. The method includes pre-programming instantaneous digital values of the boost and cut-off frequency parameters of the low pass filter of pre-equalization for each magnetic medium, as a function of purposely sensed instantaneous operating parameters of the adaptive filter that carries out the definitive equalization of the signal during a trim scanning of the magnetic medium.

    9.
    发明专利
    未知

    公开(公告)号：ITVA990020A1

    公开(公告)日：2001-01-16

    申请号：ITVA990020

    申请日：1999-07-16

    Applicant: ST MICROELECTRONICS SRL

    Inventor： DEMICHELI MARCO ,  BOLLATI GIACOMINO ,  DEMICHELI DAVIDE ,  MARCHESE STEFANO

    IPC: G11B20/10

    Abstract: A method is provided for defining programmed values of the boost and cut-off frequency parameters of a low pass filter of pre-equalization, of a read channel for a magnetic medium mass memory device, to ensure optimal functioning conditions of the adaptive filter of final equalization. The method includes pre-programming instantaneous digital values of the boost and cut-off frequency parameters of the low pass filter of pre-equalization for each magnetic medium, as a function of purposely sensed instantaneous operating parameters of the adaptive filter that carries out the definitive equalization of the signal during a trim scanning of the magnetic medium.

    10.
    发明专利
    未知

    公开(公告)号：DE69824143D1

    公开(公告)日：2004-07-01

    申请号：DE69824143

    申请日：1998-03-31

    Applicant: ST MICROELECTRONICS SRL

    Inventor： MARCHESE STEFANO ,  PISATI VALERIO ,  PORTALURI SALVATORE ,  SAVO ALESSANDRO

    IPC: H03G1/00 ,  H03G7/06 ,  H03G3/00 ,  H03G7/00

    Abstract: An amplifier with programmable gain and input linearity, comprising an input stage (10), which is suitable to receive a voltage signal (V , V ) and perform current conversion thereof with compression, and an output stage (30), which is connected to the input stage (10) and is suitable to decompress the signal in output from the input stage, producing gain amplification thereof; the particularity of the amplifier is the fact that it further comprises at least one current amplifier stage (20) which is interposed between the input stage (10) and the output stage (30) and comprises at least one bipolar transistor (21, 22) which is series-connected to a load diode (23, 24) and to a current source (2I2); programmable means (I2, I2*) for reducing the transconductance of the load diode (23, 24) being provided in the at least one amplifier stage (20) to determine a programmable amplification factor for the gain of the amplifier.

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