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    METHOD FOR CANCELING COMMON MODE CURRENT SIGNAL AND TRANSCONDUCTOR SYSTEM USING SUCH METHOP
    1.
    发明专利
    METHOD FOR CANCELING COMMON MODE CURRENT SIGNAL AND TRANSCONDUCTOR SYSTEM USING SUCH METHOP 失效

    公开(公告)号：JPH0846456A

    公开(公告)日：1996-02-16

    申请号：JP16656895

    申请日：1995-06-30

    Applicant: ST MICROELECTRONICS SRL

    Inventor： REZZI FRANCESCO ,  BASCHIROTTO ANDREA ,  CASTELLO RINALDO

    IPC: H03F3/45

    Abstract: PURPOSE: To highly reduce common mode current signals in an output terminal. CONSTITUTION: The method for canceling common mode current signals at the second transconductor circuit C2 output terminals OP1 and OM1, which are provided with the same differential mode transconductance value as the second common mode conductance value is provided with a first transconductor circuit C1, and a second transconductor circuit C2. The circuit C1 is provided with the same differential mode transconductance value as the first common mode transconductance value. The circuit C2 is provided with the common mode transconductance whose coefficient is almost the same as the second value and whose code is opposite in parallel to the first transconductor circuit C1.

    METHOD AND CIRCUIT FOR DETECTING DISPLACEMENT USING MICRO-ELECTROMECHANICAL SENSOR WITH COMPENSATION OF PARASITIC CAPACITANCE AND SPURIOUS DISPLACEMENT
    2.
    发明专利
    METHOD AND CIRCUIT FOR DETECTING DISPLACEMENT USING MICRO-ELECTROMECHANICAL SENSOR WITH COMPENSATION OF PARASITIC CAPACITANCE AND SPURIOUS DISPLACEMENT 审中-公开

    公开(公告)号：JP2003177142A

    公开(公告)日：2003-06-27

    申请号：JP2002208618

    申请日：2002-07-17

    Applicant: ST MICROELECTRONICS SRL ,  HEWLETT PACKARD CO

    Inventor： ERNESTO LASALANDRA ,  UNGARETTI TOMMASO ,  BASCHIROTTO ANDREA

    IPC: G01P21/00 ,  G01P15/125 ,  G01P15/13

    Abstract: PROBLEM TO BE SOLVED: To provide a micro-electromechanical sensor accompanied with compensation of parasitic capacitances and spurious displacements. SOLUTION: In this sensor, a fixed body 3 and a movable mass 4 are connected to a first input terminal 102 of a detection circuit, and one or more first detection capacitors 107 and second detection capacitors 108 connected respectively to a first output terminal 104 and a second output terminal 105 are formed, and a rest common detection capacity Cs is provided. The sensor has a step for closing a first negative feedback loop 136 equipped with the first detection capacitors 107, the second detection capacitors 108 and a differentiating amplifier 124, a step for supplying one or more inputs 124b of the differentiating amplifier 124 with a step detection voltage Vs through driving capacitors 121, 122 in order to generate a variation ΔVc of the electric driving quantity Vc in reverse proportion to the common detection capacity Cs, and a step for driving the sensor 101 by the electric driving quantity Vc. COPYRIGHT: (C)2003,JPO

    LOW VOLTAGE SWITCHING CAPACITANCE CIRCUIT USING SWITCHING OPERATIONAL AMPLIFIER WITH MAXIMUM VOLTAGE SWING
    3.
    发明专利
    LOW VOLTAGE SWITCHING CAPACITANCE CIRCUIT USING SWITCHING OPERATIONAL AMPLIFIER WITH MAXIMUM VOLTAGE SWING 失效

    公开(公告)号：JPH08130422A

    公开(公告)日：1996-05-21

    申请号：JP18343495

    申请日：1995-06-26

    Applicant: ST MICROELECTRONICS SRL

    Inventor： CASTELLO RINALDO ,  BASCHIROTTO ANDREA ,  NAGARI ANGELO

    IPC: H03F3/45 ,  H03H19/00

    Abstract: PURPOSE: To eliminate the loss of a charge and to hold a dynamic characteristic by stitching the output of the input switched operational amplifier structure of a switched capacitance circuit to supply voltage. CONSTITUTION: The output of the input switched operational amplifier structure of the switched capacitance circuit is switched to supply voltage Vdd instead of making it to a ground value. It is realized by using a private integrated P-channel switch in a substrate connected to supply voltage Vdd and what is called body effect is removed. Thus, the output node of the input operational amplifier A1 does not take negative voltage during an operation when the switched operational amplifier is turned off. For subtracting Vdd/2 voltage instead of adding them, a clock phase for driving two switches S2 and S3 connecting a bias capacitor Cdc to the supply node and ground is exchanged. Thus, the arbitrary loss through respective substrates can be prevented.

    TRANSCONDUCTOR CIRCUIT AND ACTIVE FILTER
    4.
    发明专利
    TRANSCONDUCTOR CIRCUIT AND ACTIVE FILTER 失效

    公开(公告)号：JPH0846457A

    公开(公告)日：1996-02-16

    申请号：JP16656995

    申请日：1995-06-30

    Applicant: ST MICROELECTRONICS SRL

    Inventor： REZZI FRANCESCO ,  BASCHIROTTO ANDREA ,  CASTELLO RINALDO

    IPC: H03F3/34 ,  H03F3/45 ,  H03H11/04

    Abstract: PURPOSE: To suppress distortion generated by a transconductance by suppressing fluctuation of a load current and voltage. CONSTITUTION: The transconductor circuit consists of two input transistors M1 and M2 that are provided with a differential input and single output and the primary induction terminals D1, S1, D2 and S2 connected to one another so as to reduce the fluctuation of load current and voltage and at the same time to suppress the distortion generated by each of the transconductances as well.

    Fully differential, switched capacitor, operational amplifier circuit with common-mode controlled output
    5.
    发明授权
    Fully differential, switched capacitor, operational amplifier circuit with common-mode controlled output 有权

    公开(公告)号：US6411166B2

    公开(公告)日：2002-06-25

    申请号：US86491601

    申请日：2001-05-23

    Applicant: ST MICROELECTRONICS SRL

    Inventor： BASCHIROTTO ANDREA ,  CUSINATO PAOLO ,  MONTAGNA GIAMPIERO ,  CASTELLO RINALDO

    IPC: H03F3/00 ,  H03F3/45

    CPC classification number: H03F3/4565 ,  H03F3/005 ,  H03F3/45183

    Abstract: A switched operational amplifier with fully differential topology, alternately switchable on and off, and a control circuit. The operational amplifier has a first differential output (4a) and a second differential output, and a control terminal. The control circuit includes a capacitive detecting network including a first capacitor and a second capacitor connected between the first and second differential outputs and a common-mode node, and a third capacitor connected between the common-mode node and ground in a first operative condition, and between the common-mode node and the supply voltage in a second operative condition. A control transistor is connected between the common-mode node and the control terminal of the operational amplifier and supplies a control current correlated to the voltage on the common-mode node. A switchable voltage source, connected to the common-mode node, supplies a desired voltage in a first operative condition, when the operational amplifier is off.

    8.
    发明专利
    未知

    公开(公告)号：ITTO20010157A1

    公开(公告)日：2002-08-21

    申请号：ITTO20010157

    申请日：2001-02-21

    Applicant: ST MICROELECTRONICS SRL

    Inventor： BASCHIROTTO ANDREA ,  LASALANDRA ERNESTO ,  UNGARETTI TOMMASO

    IPC: G01P15/125 ,  G01R27/26

    Abstract: Method for detecting movements through a micro-electric-mechanical sensor, having a fixed body and a moving mass, forming at least one first and one second detection capacitor, connected to a common node and to a first, respectively a second detection node and having a common detection capacitance at rest and a capacitive unbalance in case of a movement. The method includes the steps of: feeding the common node with a constant detection voltage of predetermined duration; generating a feedback voltage to maintain the first and the second detection node at a constant common mode voltage; generating a compensation electric quantity, inversely proportional to the common detection capacitance at least in one predetermined range; supplying the compensating electric quantity to the common node; and detecting an output quantity related to the capacitive unbalance.

    9.
    发明专利
    未知

    公开(公告)号：DE69621615D1

    公开(公告)日：2002-07-11

    申请号：DE69621615

    申请日：1996-10-11

    Applicant: ST MICROELECTRONICS SRL

    Inventor： BASCHIROTTO ANDREA ,  NAGARI ANGELO ,  CASTELLO RINALDO

    IPC: H03F1/08 ,  H03F3/72 ,  H03H1/00

    Abstract: In a switched operational amplifier including a differential input stage and at least a second output stage the compensation capacitor (CC) commonly required to couple the output node of the second stage with the respective output node of the input differential stage of the amplifier is associated with switching means (M5P, M5N) controlled by the same control phase (Ph1) that enables/disables the amplifier for interrupting the connection between the compensation capacitor (CC) and the output node of the differential input stage during a phase in which the amplifier is disabled for reducing the switch-on time. Notably the differential input stage of the operational amplifier remains always active and only the second output stage is switched on and off.

    10.
    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.

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