公开(公告)号：JPH06216657A

公开(公告)日：1994-08-05

申请号：JP25491693

申请日：1993-09-16

Applicant: ST MICROELECTRONICS SRL

Inventor： ONETTI ANDREA MARIO ,  ROSSI DOMENICO

IPC: H03F1/26 ,  H03F1/02 ,  H03F3/45 ,  H03G3/20 ,  H03G3/30 ,  H03G5/16

Abstract: PURPOSE: To provide a mutual differential conductance input stage in which a bias condition is corrected by varying amplitude of a signal to be supplied to an input stage of a differential stage to improve entire noise characteristics of an amplifier. CONSTITUTION: The differential stage is configured by providing a means to reduce bias current by an amount in inversely proportional to the amplitude of an input signal vin with the differential stage including a pair of transistors Q1 and Q2 with a degenerate resistor R. Noise at a high level generated by an input stage in a conventional device with high input dynamic characteristics is solved by the differential stage.

公开(公告)号：DE69414367T2

公开(公告)日：1999-04-01

申请号：DE69414367

申请日：1994-02-25

Applicant: ST MICROELECTRONICS SRL

Inventor： ONETTI ANDREA MARIO ,  TONELLA MAURIZIO

IPC: H03G1/00 ,  H03G5/02 ,  H03H11/12

Abstract: A circuit for controlling frequency and/or phase response characteristic of a signal amplification system or channel has a serial architecture composed of a plurality of cells and a selector for deriving the signal after any one of the cascaded cells. At least a component of the RC network of each cell is in the form of a plurality of modules of fractionary value connected in series. A short-circuiting switch is associated with each module of fractionary value and the overall effect may be selected by selecting the derivation node of the output signal and a certain configuration of the short-circuiting switches of the RC networks of the various cells. An outstanding flexibility of selection is achieved.

公开(公告)号：DE69229731D1

公开(公告)日：1999-09-09

申请号：DE69229731

申请日：1992-09-16

Applicant: ST MICROELECTRONICS SRL

Inventor： ONETTI ANDREA MARIO ,  ROSSI DOMENICO

IPC: H03F1/26 ,  H03F1/02 ,  H03F3/45 ,  H03G3/20 ,  H03G3/30 ,  H03G5/16 ,  H03F1/32

Abstract: The dynamic range of operation of a transconductance differential input stage is reduced when the amplitude of the input signal decreases, thus reducing the level of the noise that is generated by the input stage. A DC signal representaive of the sensed amplitude of the input signal is employed for either reducing the value of a common, emitter-degenerating resistance (R) or of the bias current that is forced in the two branches of the differential input stage.

公开(公告)号：DE69414367D1

公开(公告)日：1998-12-10

申请号：DE69414367

申请日：1994-02-25

Applicant: ST MICROELECTRONICS SRL

Inventor： ONETTI ANDREA MARIO ,  TONELLA MAURIZIO

IPC: H03G1/00 ,  H03G5/02 ,  H03H11/12

Abstract: A circuit for controlling frequency and/or phase response characteristic of a signal amplification system or channel has a serial architecture composed of a plurality of cells and a selector for deriving the signal after any one of the cascaded cells. At least a component of the RC network of each cell is in the form of a plurality of modules of fractionary value connected in series. A short-circuiting switch is associated with each module of fractionary value and the overall effect may be selected by selecting the derivation node of the output signal and a certain configuration of the short-circuiting switches of the RC networks of the various cells. An outstanding flexibility of selection is achieved.

公开(公告)号：DE69534226D1

公开(公告)日：2005-06-30

申请号：DE69534226

申请日：1995-07-14

Applicant: ST MICROELECTRONICS SRL

Inventor： ONETTI ANDREA MARIO ,  PROCURATO SYLVIA

IPC: H03K17/16 ,  H03K19/003 ,  H03K19/00

公开(公告)号：DE69528521D1

公开(公告)日：2002-11-14

申请号：DE69528521

申请日：1995-07-14

Applicant: ST MICROELECTRONICS SRL

Inventor： ONETTI ANDREA MARIO ,  PROCURATO SYLVIA

IPC: H03G3/00 ,  H03G3/34 ,  H03K17/16 ,  H03H7/24

公开(公告)号：DE69229731T2

公开(公告)日：1999-12-23

申请号：DE69229731

申请日：1992-09-16

Applicant: ST MICROELECTRONICS SRL

Inventor： ONETTI ANDREA MARIO ,  ROSSI DOMENICO

IPC: H03F1/26 ,  H03F1/02 ,  H03F3/45 ,  H03G3/20 ,  H03G3/30 ,  H03G5/16 ,  H03F1/32

Abstract: The dynamic range of operation of a transconductance differential input stage is reduced when the amplitude of the input signal decreases, thus reducing the level of the noise that is generated by the input stage. A DC signal representaive of the sensed amplitude of the input signal is employed for either reducing the value of a common, emitter-degenerating resistance (R) or of the bias current that is forced in the two branches of the differential input stage.