公开(公告)号：DE3472874D1

公开(公告)日：1988-08-25

申请号：DE3472874

申请日：1984-08-24

Applicant: IBM ,  IBM FRANCE

Inventor： GENESTE MICHEL ,  JACQUART CHRISTIAN

IPC: H04L1/24 ,  H04L25/02 ,  H04L69/40

Abstract: Outgoing terminals (1, 2) and incoming terminals (3, 4) are connected to an outgoing line (LX) and an incoming line (LR) respectively. A differential amplifier (T1-T2) has two load circuits and has its inputs connected to the incoming terminals. One of the load circuits is connected to the outgoing line. A switch (SW.T6) connects the incoming terminals wither to the incoming line or to the other load circuit. Control logic (a, b, T6, T7) allows the load circuit to be selected by connecting that circuit to the supply. The load circuits are diodes in series with resistors.

公开(公告)号：DE3473803D1

公开(公告)日：1988-10-06

申请号：DE3473803

申请日：1984-06-20

Applicant: IBM ,  IBM FRANCE

Inventor： BONNET YVES AIME JEAN ,  JACQUART CHRISTIAN

IPC: H04Q3/72 ,  H04M3/22

Abstract: A constant-voltage generator comprising a 100 kHz multivibrator (30), HF transformer (28) and full-wave rectifier (D1,D2) is connected to the terminals (A,B) of a resistance (r) of 10 ohms in series with the telephone line (LL). The prim. winding of the transformer (28) is centre-tapped to a 5V DC supply via a 511-ohm resistance (R). When current flows along the line (LL), its combination with the rectified HF current is detected at the centre tap (C) and pref. compared with the reference output of another DC-DC convertor, and amplified with addn. of an AC signal (Vref) corresp. to twice the amplitude of the line current signal.

公开(公告)号：IT1150989B

公开(公告)日：1986-12-17

申请号：IT2191180

申请日：1980-05-09

Applicant: IBM

Inventor： JACQUART CHRISTIAN

IPC: H03K17/04 ,  H01L27/07 ,  H02M3/337 ,  H03K17/567 ,  H03K

Abstract: Signals to the base of a bipolar transistor and to the gate of a parallel - connected FET are timed to turn on the two transistors simultaneously and to turn off the bipolar transistor before the FET. The shorter switching time of the FET is combined with the low resistance of the bipolar transistor to provide a switch that is particularly useful in a switched-type power supply with increased switched frequency.

公开(公告)号：DE69019746T2

公开(公告)日：1996-01-25

申请号：DE69019746

申请日：1990-08-29

Applicant: IBM

Inventor： FERMIER YVAN ,  FERRY MICHEL ,  JACQUART CHRISTIAN ,  VACHEE PIERRE

IPC: G06F1/30 ,  H02H3/08 ,  H02H3/087 ,  H02J13/00

Abstract: The overload protection circuit 12 comprises a resistor bridge 20 with a low impedance sensing resistor r and high impedance resistors R1 to R4 which generates voltages Va and Vb at the inputs 32 and 34 of a comparator 22. Voltage Vb depend upon the value of the load current so that the comparator provides at its output 36 a control signal for opening the switching device 24 comprising a field effect transistor when the load current exceeds a maximum value. Resistor R5 reinforces the effect of the control signal. This circuit can be used in a system which comprises a central power supply unit 8 which powers a plurality of devices such as 4. The status of the circuit 12 is reported to the system 8 though line 14 and circuit 12 comprises a control circuit 26 which is responsive to set and reset control signals on lines 14 and 18 from the unit 8 to close or open the switch 26.

公开(公告)号：BE857998A

公开(公告)日：1977-12-16

申请号：BE180340

申请日：1977-08-22

Applicant: IBM

Inventor： CROISIER ALAIN ,  JACQUART CHRISTIAN

IPC: H04M19/00 ,  H04M

Abstract: A circuit for interfacing an AF line to a central unit makes use of an RF transformer Tr. Said transformer is so arranged that the source AF signal to be transmitted modulates an RF carrier generated in a primary winding of the transformer and the resulting modulated signal in the secondary winding is demodulated before being transmitted to a line which is thereby linked to the source.

公开(公告)号：DE3587950T2

公开(公告)日：1995-05-24

申请号：DE3587950

申请日：1985-12-30

Applicant: IBM

Inventor： CZARNIAK JEAN-CHRISTOPHE ,  JACQUART CHRISTIAN ,  FERRY MICHEL FRANCOIS

IPC: H03M1/68 ,  H03M1/00 ,  H03M1/66 ,  H03M1/72

Abstract: A digital-Analog Converter for converting an N-bit digital word into its analog representation including means for splitting the N bits into n sections of N/n bits each. For instance a 12-bit word is split into an odd section and an even section which are processed independently and in parallel. This results in two partial results, Vi and Vp respectively representative of the odd and even bit sections. The last step of the conversion is the action (9) of the two partial results Vi and Vp to provide the analog representation of the 12-bit word. Few operators are required to process each section because each bit is converted sequentially. This provides a low cost, compact and simple converter ; moreover, since few operators are required, it may be advantageous to use high precision operators such as disclosed further on.

公开(公告)号：DE2801272A1

公开(公告)日：1978-07-20

申请号：DE2801272

申请日：1978-01-13

Applicant: IBM

Inventor： JACQUART CHRISTIAN ,  LEIGHTON HOWARD N ,  WILFINGER RAYMOND J

IPC: G11C27/04 ,  B61L7/08 ,  G11C19/18 ,  G11C19/28 ,  G11C27/00 ,  H01L21/33 ,  H01L21/339 ,  H01L27/105 ,  H01L29/70 ,  H01L29/762 ,  H01L29/78 ,  H03H7/30 ,  H03H15/02 ,  H03M1/00 ,  H01L29/66

公开(公告)号：CA1261922A

公开(公告)日：1989-09-26

申请号：CA480611

申请日：1985-05-02

Applicant: IBM

Inventor： BONNET YVES A ,  JACQUART CHRISTIAN

IPC: H04Q3/72 ,  H04M3/22

Abstract: The circuit of the present invention detects variations of a current IL flowing in a telephone line LL. A low-value resistor r is connected in series with line LL. A constant voltage generator is connected across this resistor. The current Is applied to resistor r by the constant voltage generator varies as a function of IL. This being so, a measurement of the variations of Is will reflect variations of IL and, therefore, can be used to detect both amplitude and directional variations of IL.

公开(公告)号：BR8502791A

公开(公告)日：1986-02-18

申请号：BR8502791

申请日：1985-06-12

Applicant: IBM

Inventor： BONNET YVES AIME ,  JACQUART CHRISTIAN

IPC: H04Q3/72 ,  H04M3/22 ,  H04M3/14

Abstract: The circuit of the present invention detects variations of a current IL flowing in a telephone line LL. A low-value resistor r is connected in series with line LL. A constant voltage generator is connected across this resistor. The current Is applied to resistor r by the contant voltage generator varies as a function of IL. This being so, a measurement of the variations of Is will reflect variations of IL and, therefore, can be used to detect both amplitude and directional variations of IL.

公开(公告)号：FR2458950A1

公开(公告)日：1981-01-02

申请号：FR7915736

申请日：1979-06-12

Applicant: IBM FRANCE

Inventor： JACQUART CHRISTIAN

IPC: H03K17/04 ,  H01L27/07 ,  H02M3/337 ,  H03K17/567 ,  H02M7/537

Abstract: Signals to the base of a bipolar transistor and to the gate of a parallel - connected FET are timed to turn on the two transistors simultaneously and to turn off the bipolar transistor before the FET. The shorter switching time of the FET is combined with the low resistance of the bipolar transistor to provide a switch that is particularly useful in a switched-type power supply with increased switched frequency.