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    STRUCTURE FOR TIME CONTINUOUS FIR FILTER TO EXECUTE HILBERT TRANSFORM AND METHOD FOR FILTERING SIGNAL
    11.
    发明专利
    STRUCTURE FOR TIME CONTINUOUS FIR FILTER TO EXECUTE HILBERT TRANSFORM AND METHOD FOR FILTERING SIGNAL 失效

    公开(公告)号：JP2001274657A

    公开(公告)日：2001-10-05

    申请号：JP2001031150

    申请日：2001-02-07

    Applicant: ST MICROELECTRONICS SRL

    Inventor： PISATI VALERIO ,  ROSSI AUGUSTO ,  BETTI GIORGIO ,  CAZZANIGA MARCO

    IPC: G11B5/09 ,  G11B20/10 ,  H03H17/02 ,  H03H17/06

    Abstract: PROBLEM TO BE SOLVED: To provide an FIR filter design that has a structure and a functional feature suitable for processing a signal whose spectrum is not known in advance and executes Hilbert transform so as to eliminate limitations and overcome defects of the design of a conventional technology. SOLUTION: This invention relates to a time continuous FIR(finite impulse response) filter that executes the Hilbert transform. The filter is provided with a delay cell connected in cascade between an input terminal and an output terminal of the filter and with a programmable time delay(Td) for a programmable filter cell having fixed filter coefficients (c0,..., cn). Furthermore, this invention also relates to a filtering method to use the structure of the Hilbert FIR filter to process a signal produced by reading data from a magnetic storage medium adopting the vertical recording.

    HIGH-PASS FILTER
    13.
    发明专利
    HIGH-PASS FILTER 失效

    公开(公告)号：JPH0879006A

    公开(公告)日：1996-03-22

    申请号：JP20722395

    申请日：1995-08-14

    Applicant: ST MICROELECTRONICS SRL

    Inventor： BRIANTI FRANCESCO ,  ALINI ROBERTO ,  PISATI VALERIO ,  GADDUCCI PAOLO

    IPC: H03H11/04

    Abstract: PROBLEM TO BE SOLVED: To constitute a fourth cell which operates with a low supply power, does not require any floating capacitance, and has a low capacitance load at its input terminal. SOLUTION: A high-pass filter constituted of a current generating circuit 29 which is particularly used for high frequencies, has at least each one of input terminal IN and output terminal OUT, between which a transfer function (Fdt) is formed, incorporates serially arranged transconductance stages 2-5, is connected between a pair of stages 2 and 3 of a fourth cell 18 and a reference voltage (GND), and generates variable currents iK1 and iK2 . The circuit 29 makes the introduction of a programmable zero to the transfer function (Fdt) of the filter 20 possible.

    TRANSFORMER CONDUCTOR
    14.
    发明专利
    TRANSFORMER CONDUCTOR 失效

    公开(公告)号：JPH0865064A

    公开(公告)日：1996-03-08

    申请号：JP19561095

    申请日：1995-07-31

    Applicant: ST MICROELECTRONICS SRL

    Inventor： PISATI VALERIO ,  ALINI ROBERTO ,  CASTELLO RINALDO ,  VAI GIANFRANCO

    IPC: H03F3/343 ,  H03F3/45 ,  H03G1/00 ,  H03H11/24

    Abstract: PROBLEM TO BE SOLVED: To control the gain of integrator with built-in transconductor by changing the output resistance of active load. SOLUTION: This device comprises a transconductance stage 3 having two input terminals I1 and I2 at least and two output terminals O1 and O2 at least and provided with an active load 4 connected to the output terminals O1 and O2 on the transconductance stage 3 and control circuit 5 for active load 4 connected between the output terminals O1 and O2 and the active load 4.

    16.
    发明专利
    未知

    公开(公告)号：DE69530838D1

    公开(公告)日：2003-06-26

    申请号：DE69530838

    申请日：1995-06-30

    Applicant: ST MICROELECTRONICS SRL

    Inventor： GADDUCCI PAOLO ,  MOLONEY DAVID ,  BRIANTI FRANCESCO ,  PISATI VALERIO

    IPC: G06F7/02

    Abstract: The invention relates to a basic cell (11) for comparing a first and a second digital signal (A, B), of the type having at least a first and a second input (I1, I2) and a first and a second output (O3, O4) and comprising at least one logic gate (14) receiving digital signals (A, B) at a first and a second signal input (IS1, IS2), and which comprises at least a first and a second controlled switch (P1, P2) inserted in parallel with each other between the output terminal of the logic gate (14) and the second output (O4) from the cell (11), the first switch (P1) being also connected between the first input (I1) and the first output (O3) of the cell (11) and the second switch (P2) being also connected between the second input (I2) and the second output (O4) of the cell (11). The invention also relates to a digital comparator (9) comprising a plurality of basic cells according to the invention.

    17.
    发明专利
    未知

    公开(公告)号：DE69431656D1

    公开(公告)日：2002-12-12

    申请号：DE69431656

    申请日：1994-08-12

    Applicant: ST MICROELECTRONICS SRL

    Inventor： BRIANTI FRANCESCO ,  ALINI ROBERTO ,  PISATI VALERIO ,  GADDUCCI PAOLO

    IPC: H03H11/04 ,  H03H1/00

    Abstract: A high-pass filter in particular for high-frequency applications and of the type comprising at least one input terminal (IN) and at least one output terminal (OUT) between which is defined a transfer function (FdT) and is inserted a biquadratic cell (18) incorporating a series of transconductance stages (2, 3, 4, 5) comprises a generator circuit (29) of variable currents (iK1, iK2) connected between a pair of stages (2, 3) of the biquadratic cell (18) and a voltage reference (GND). Said generator allows introduction of programmable zeroes in the transfer function (FdT) of the filter (20).

    18.
    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.

    19.
    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.

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