公开(公告)号：DE60205333T2

公开(公告)日：2006-06-01

申请号：DE60205333

申请日：2002-05-31

Applicant: ST MICROELECTRONICS SRL

Inventor： GANDOLFI GABRIELE ,  BASCHIROTTO ANDREA ,  COLONNA VITTORIO

IPC: H03M3/00

公开(公告)号：IT1320380B1

公开(公告)日：2003-11-26

申请号：ITTO20000493

申请日：2000-05-26

Applicant: ST MICROELECTRONICS SRL

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

IPC: H03F3/00 ,  H03F3/45

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.

公开(公告)号：ITMI20031248D0

公开(公告)日：2003-06-20

申请号：ITMI20031248

申请日：2003-06-20

Applicant: ST MICROELECTRONICS SRL

Inventor： BASCHIROTTO ANDREA ,  D AMICO STEFANO ,  GOLA ALBERTO

IPC: H03H11/04 ,  H03K5/22

Abstract: A continuous-time filter comprising at least one amplifier and at least one passive element. The amplifier comprises at least one input terminal and at least one output terminal and the passive element is positioned between the terminals. In addition the amplifier is provided with a transconductance gain. The filter comprises circuit means suitable for correlating the transconductance gain of the amplifier with the passive element.

公开(公告)号：IT1316795B1

公开(公告)日：2003-05-12

申请号：ITMI20000468

申请日：2000-03-09

Applicant: ST MICROELECTRONICS SRL

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

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.

公开(公告)号：ITTO20010699A1

公开(公告)日：2003-01-17

申请号：ITTO20010699

申请日：2001-07-17

Applicant: ST MICROELECTRONICS SRL ,  HEWLETT PACKARD CO

Inventor： BASCHIROTTO ANDREA ,  LASALANDRA ERNESTO ,  UNGARETTI TOMMASO

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

Abstract: A method for detecting displacements of a micro-electromechanical sensor (101) including a fixed body (3) and a mobile mass (4), forming at least a first sensing capacitor (107) and a second sensing capacitor (108), which are connected to a first input terminal (102) and, respectively, to a first output terminal (104) and to a second output terminal (105) of the sensing circuit and have a rest common sensing capacitance (Cs). The method includes the steps of: closing a first negative-feedback loop (136), which comprises the first sensing capacitor (107) and the second sensing capacitor (108) and a differential amplifier (124); supplying to at least one input (124b) of the differential amplifier (124) a staircase sensing voltage (Vs) through driving capacitors (121, 122) so as to produce variations ( DELTA Vc) of an electrical driving quantity (Vc) which are inversely proportional to the common sensing capacitance (Cs); and driving the sensor (101) with the electrical driving quantity (Vc) .

公开(公告)号：DE69428888T2

公开(公告)日：2002-07-04

申请号：DE69428888

申请日：1994-06-30

Applicant: ST MICROELECTRONICS SRL

Inventor： REZZI FRANCESCO ,  BASCHIROTTO ANDREA ,  CASTELLO RINALDO

IPC: H03F3/45

Abstract: The transconductor system in accordance with the present invention is the type comprising a first transconductor circuit (C1) having differential mode transconductance equal to a first value and common mode transconductance equal to a second value and is characterised in that it comprises a second transconductor circuit (C2) connected in parallel with said transconductor circuit (C1) having common mode transconductance substantially equal in modulus to said second value and of opposite sign. In this manner the common mode current signal at the output is greatly reduced.

公开(公告)号：DE69428888D1

公开(公告)日：2001-12-06

申请号：DE69428888

申请日：1994-06-30

Applicant: ST MICROELECTRONICS SRL

Inventor： REZZI FRANCESCO ,  BASCHIROTTO ANDREA ,  CASTELLO RINALDO

IPC: H03F3/45

Abstract: The transconductor system in accordance with the present invention is the type comprising a first transconductor circuit (C1) having differential mode transconductance equal to a first value and common mode transconductance equal to a second value and is characterised in that it comprises a second transconductor circuit (C2) connected in parallel with said transconductor circuit (C1) having common mode transconductance substantially equal in modulus to said second value and of opposite sign. In this manner the common mode current signal at the output is greatly reduced.

公开(公告)号：DE69428785D1

公开(公告)日：2001-11-29

申请号：DE69428785

申请日：1994-06-30

Applicant: ST MICROELECTRONICS SRL

Inventor： REZZI FRANCESCO ,  BASCHIROTTO ANDREA ,  CASTELLO RINALDO

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

公开(公告)号：ITTO20000493A1

公开(公告)日：2001-11-26

申请号：ITTO20000493

申请日：2000-05-26

Applicant: ST MICROELECTRONICS SRL

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

IPC: H03F3/00 ,  H03F3/45

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.

公开(公告)号：ITMI20000468A1

公开(公告)日：2001-09-10

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.