公开(公告)号：JPH06303290A

公开(公告)日：1994-10-28

申请号：JP33163093

申请日：1993-12-27

Applicant: ST MICROELECTRONICS SRL

Inventor： CONSIGLIO PIETRO ,  ANTONINI CARLO ,  VANALLI GIANPIETRO

IPC: H04M1/00 ,  H04M1/60 ,  H04M1/738

Abstract: PURPOSE: To provide a device having a monolithically integrated line switch by providing a circuit interface which drives a pair of switches and providing the circuit interface with a unidirectional current pass circuit element which controls a driving current generated internally. CONSTITUTION: An input terminal E for application of an external electric signal related to a circuit node G and a circuit interface means CI which has output terminals to drive switches SW2 and SW3 through an actuator circuit ACT are provided. In the circuit interface CI, a unidirectional current circuit element like a diode D1 is connected in parallel with the switch SW3 between a terminal 36 of a bridge circuit PP and a circuit node G. That is, the switch SW3 can be operated by the diode D1 provided between the bridge circuit PP and a substrate. Consequently, the driving current generated in the circuit interface means CI by the external electric signal goes to the substrate through the diode in any polarity state.

公开(公告)号：DE69231822T2

公开(公告)日：2001-12-13

申请号：DE69231822

申请日：1992-12-30

Applicant: ST MICROELECTRONICS SRL

Inventor： CONSIGLIO PIETRO ,  ANTONINI CARLO ,  VANALLI GIANPIETRO

IPC: H04M1/00 ,  H04M1/60 ,  H04M1/738

Abstract: A telephone subscriber system comprising a speech circuit (SPC) and a ring circuit (RIN) adapted to be integrated monolithically to a semiconductor material substrate (G) and being coupled to a telephone subscriber line (SL), respectively through first (PP) and second (PR) circuit means of the diode bridge type, further comprises a first circuit changeover means (SW1), under control by the user, which drives at least second (SW2) and third (SW3) circuit changeover means connected between the first diode bridge circuit (PP) and the speech circuit (SPC). The third circuit changeover means (SW3) is connected to the speech and ring circuits at a circuit communication node (G) which forms the system point of reference, physically coincident with the substrate. The system includes a circuit interface means (CL) for controlling the second (SW2) and third (SW3) circuit changeover means by external electrical signals which are related to the circuit communication node (G). Said circuit interface means (CL) comprises a diode (D1) connected with its cathode to the circuit communication node (G), in parallel with the third circuit changeover means (SW3).

公开(公告)号：DE69231822D1

公开(公告)日：2001-06-13

申请号：DE69231822

申请日：1992-12-30

Applicant: ST MICROELECTRONICS SRL

Inventor： CONSIGLIO PIETRO ,  ANTONINI CARLO ,  VANALLI GIANPIETRO

IPC: H04M1/00 ,  H04M1/60 ,  H04M1/738

Abstract: A telephone subscriber system comprising a speech circuit (SPC) and a ring circuit (RIN) adapted to be integrated monolithically to a semiconductor material substrate (G) and being coupled to a telephone subscriber line (SL), respectively through first (PP) and second (PR) circuit means of the diode bridge type, further comprises a first circuit changeover means (SW1), under control by the user, which drives at least second (SW2) and third (SW3) circuit changeover means connected between the first diode bridge circuit (PP) and the speech circuit (SPC). The third circuit changeover means (SW3) is connected to the speech and ring circuits at a circuit communication node (G) which forms the system point of reference, physically coincident with the substrate. The system includes a circuit interface means (CL) for controlling the second (SW2) and third (SW3) circuit changeover means by external electrical signals which are related to the circuit communication node (G). Said circuit interface means (CL) comprises a diode (D1) connected with its cathode to the circuit communication node (G), in parallel with the third circuit changeover means (SW3).