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    11.
    发明专利
    未知

    公开(公告)号：ITRM20000425D0

    公开(公告)日：2000-07-31

    申请号：ITRM20000425

    申请日：2000-07-31

    Applicant: ST MICROELECTRONICS SRL

    Inventor： CUSINATO PAOLO ,  BASCHIROTTO ANDREA ,  PASOLINI FABIO

    IPC: H03M3/00

    Abstract: A method of re-establishing the stability of a sigma-delta modulator having a plurality of integrator stages in cascade and a quantizer, achieving very short resetting times, a bit sequence corresponding to an instability state of the modulator is defined, the bit-stream output by the modulator is monitored to check whether it includes the instability sequence and, if the instability sequence is detected, the last integrator stage is reset and one or more preceding integrator stages are reset, progressively, until the instability sequence is no longer detected.

    16.
    发明专利
    未知

    公开(公告)号：ITRM20000425A1

    公开(公告)日：2002-01-31

    申请号：ITRM20000425

    申请日：2000-07-31

    Applicant: ST MICROELECTRONICS SRL

    Inventor： CUSINATO PAOLO ,  BASCHIROTTO ANDREA ,  PASOLINI FABIO

    IPC: H03M3/00

    Abstract: A method of re-establishing the stability of a sigma-delta modulator having a plurality of integrator stages in cascade and a quantizer, achieving very short resetting times, a bit sequence corresponding to an instability state of the modulator is defined, the bit-stream output by the modulator is monitored to check whether it includes the instability sequence and, if the instability sequence is detected, the last integrator stage is reset and one or more preceding integrator stages are reset, progressively, until the instability sequence is no longer detected.

    17.
    发明专利
    未知

    公开(公告)号：ITMI20000468D0

    公开(公告)日：2000-03-09

    申请号：ITMI20000468

    申请日：2000-03-09

    Applicant: ST MICROELECTRONICS SRL

    Inventor： BASCHIROTTO ANDREA ,  CUSINATO PAOLO ,  GANDOLFI GABRIELE ,  COLONNA VITTORIO

    IPC: H03F3/30 ,  H03F3/45

    Abstract: A class AB single-stage operational amplifier having input decoupler stages for voltage signals, a voltage repeater stage, biasing transistors and bias current generators for the input decoupler stages, and capacitors placed between the input decoupler stages and the voltage repeater stage so as to increase the phase margin.

    18.
    发明专利
    未知

    公开(公告)号：DE60024246D1

    公开(公告)日：2005-12-29

    申请号：DE60024246

    申请日：2000-06-23

    Applicant: ST MICROELECTRONICS SRL

    Inventor： COLONNA VITTORIO ,  BASCHIROTTO ANDREA ,  CUSINATO PAOLO ,  GANDOLFI GABRIELE

    IPC: H03F3/45

    Abstract: The present invention refers to a completely differential operational amplifier of the folded cascode type. In one embodiment the completely differential operational amplifier of the folded cascode type comprises: a differential output stage (15, 16, 17, 18, 19, 20 21, 22); a differential input stage (11, 12) able to drive said output stage (15, 16, 17, 18, 19, 20 21, 22); said differential output stage (15, 16, 17, 18, 19, 20 21, 22) includes a first branch (15, 16, 17, 18) having at least a first (16) and a second (17) transistor, and a second branch (19, 20 21, 22) having at least a third (20) and a fourth (21) transistor; said first (15, 16, 17, 18) and second (19, 20 21, 22) branch are coupled to a first (VDD) and to a second (GND) feeding voltage; a feedback circuit (40) of said first (16), second (17), third (20) and fourth (21) transistors; characterized in that said feedback circuit (40) is constituted by a single amplifier (40) having four inputs (IN1, IN2, IN3, IN4) and four outputs (OUT1, OUT2, OUTS, OUT4), said four inputs (IN1, IN2, IN3, IN4) take the voltage present on a terminal (23, 13, 24, 14) of said first (16), second (17), third (20) and fourth (21) transistors, and said four outputs (OUT1, OUT2, OUT3, OUT4) provide each a voltage to the control elements of said first (16), second (17), third (20) and fourth (21) transistors, which depend on the value of the input voltage of said four inputs (IN1, IN2, IN3, IN4).

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