公开(公告)号：JP2000196509A

公开(公告)日：2000-07-14

申请号：JP31805599

申请日：1999-11-09

Applicant: ST MICROELECTRONICS SRL

Inventor： PULVIRENTI FRANCESCO ,  BONTEMPO GREGORIO ,  PALUMBO GAETANO

IPC: H04B3/54 ,  H02J13/00

Abstract: PROBLEM TO BE SOLVED: To obtain a circuit that has a similar function to that of a known circuit with a simple configuration without the need of a synchronizing signal. SOLUTION: The signal detection circuit that constructs a detection signal of a 2-feeding power supplies and one transmission line to be a positive and a negative changes in at least one supply voltage on wiring of the transmission line is provided with a low pass filter 20 that applies a prescribed reference voltage V+ nearly equal to a voltage of a line selected in advance from two lines connected to the two lines of the transmission line at its filter output terminal, a 1st threshold comparator 21 that has a reference input terminal 27 and a threshold input terminal 29 connected respectively to the output terminal 18 of the filter 20 and the pre-selected line in the two lines, and a 2nd threshold comparator 22 that has a reference input terminal 28 and a threshold input terminal 30 respectively connected to the pre-selected line in the two lines and the output terminal of the filter 20. The detection circuit is configured comparatively simply and requires no synchronizing signal for its operation and needs only a very small area for the provision of an integrated circuit.

公开(公告)号：DE69811674T2

公开(公告)日：2004-04-29

申请号：DE69811674

申请日：1998-11-09

Applicant: ST MICROELECTRONICS SRL

Inventor： PULVIRENTI FRANCESCO ,  BONTEMPO GREGORIO ,  PALUMBO GAETANO

IPC: H04B3/54 ,  H02J13/00

Abstract: A circuit for detecting signals present on a bifilar voltage-supply and signal-transmission line, in which the signals are constituted by positive and negative variations of the supply potential of at least one of the wires of the line (2), comprises: a low-pass filter (20) connected to the two wires of the line in order to supply, at an output terminal of the filter, a constant reference potential (V+) substantially equal to the supply potential of a preselected one of the two wires, a first threshold comparator (21) having a reference input terminal (27) and a threshold input terminal (29) connected, respectively, to the output terminal (18) of the filter (20) and to the preselected wire of the two wires, and a second threshold comparator (22) having a reference input terminal (28) and a threshold input terminal (30) connected, respectively, to the preselected wire of the two wires and to the output terminal (18) of the filter (20). The circuit is relatively simple, does not require synchronization signals, and can be formed as an integrated circuit, taking up a limited area.

公开(公告)号：ITMI20040309A1

公开(公告)日：2004-05-24

申请号：ITMI20040309

申请日：2004-02-24

Applicant: ST MICROELECTRONICS SRL

Inventor： PALUMBO GAETANO ,  PAPPALARDO DOMENICO ,  UCCIARDELLO CARMELO

IPC: G05F1/10

公开(公告)号：DE69811674D1

公开(公告)日：2003-04-03

申请号：DE69811674

申请日：1998-11-09

Applicant: ST MICROELECTRONICS SRL

Inventor： PULVIRENTI FRANCESCO ,  BONTEMPO GREGORIO ,  PALUMBO GAETANO

IPC: H04B3/54 ,  H02J13/00

Abstract: A circuit for detecting signals present on a bifilar voltage-supply and signal-transmission line, in which the signals are constituted by positive and negative variations of the supply potential of at least one of the wires of the line (2), comprises: a low-pass filter (20) connected to the two wires of the line in order to supply, at an output terminal of the filter, a constant reference potential (V+) substantially equal to the supply potential of a preselected one of the two wires, a first threshold comparator (21) having a reference input terminal (27) and a threshold input terminal (29) connected, respectively, to the output terminal (18) of the filter (20) and to the preselected wire of the two wires, and a second threshold comparator (22) having a reference input terminal (28) and a threshold input terminal (30) connected, respectively, to the preselected wire of the two wires and to the output terminal (18) of the filter (20). The circuit is relatively simple, does not require synchronization signals, and can be formed as an integrated circuit, taking up a limited area.