Abstract: An H-bridge circuit capable of performing switching using one or more intermediate voltage phases each held for a period of time in the midst of the switching operation. This reduces power dissipation associated with the switching operation, while only using one set of high/low voltage supplies. The H-bridge may be used to provide current via an inductor to a load. A class AB amplifier may be placed in parallel with the H-bridge to provide supplemental correcting current to the load to allow the combination to act as an efficient and accurate signal driver. Furthermore, the use of intermediate voltages in the H bridge allows for increased slew rates for any given operation frequency, and allows for the driving of a given signal on the load using a lower operational frequency.

Abstract: A hybrid circuit that couples a broadband modem to a POTS or ISDN telecommunication line (TL) and includes a transformer bridge circuit (TBC) that includes a bridge circuit (BC). The bridge circuit includes four legs formed by impedance matching networks and parts of the transformer, and a differential drive amplifier (DRV) that performs impedance synthesis. A secondary winding (TS) of the transformer is magnetically coupled to the first and the second primary windings and is electrically coupled to the telecommunication line. First and second impedance dividers (Zhin1, Zhout1 and Zhin2, Zhout2) are connected to the various nodes to provide outputs to a receive amplifier (RCV). The impedance matching networks (Zm1; Zm2) include various passive and reactive components that together provide an impedance value selected based upon the line impedance reflected into the primary windings (TP1; TP2) of the transformer.

Abstract: A line driver having a non-linear amplifier that is arranged to provide a first output signal, which is an amplified input signal. The line driver also includes an analog linear amplifier providing a second output signal based on the difference between the input signal and the first output signal, placed in parallel with the non-linear amplifier. The line driver also includes a device to combine the first output signal and the second output signal to provide a total output signal to an output line.

Abstract: A hybrid circuit that couples a broadband modem to a POTS or ISDN telecommunication line (TL) and includes a transformer bridge circuit (TBC) that includes a bridge circuit (BC). The bridge circuit includes four legs formed by impedance matching networks and parts of the transformer, and a differential drive amplifier (DRV) that performs impedance synthesis. A secondary winding (TS) of the transformer is magnetically coupled to the first and the second primary windings and is electrically coupled to the telecommunication line. First and second impedance dividers (Zhin1, Zhout1 and Zhin2, Zhout2) are connected to the various nodes to provide outputs to a receive amplifier (RCV). The impedance matching networks (Zm1; Zm2) include various passive and reactive components that together provide an impedance value selected based upon the line impedance reflected into the primary windings (TP1; TP2) of the transformer.

Abstract: A hybrid circuit that couples a broadband modem to a POTS or ISDN telecommunication line (TL) and comprises a transformer bridge circuit (TBC) that includes a bridge circuit (BC). The bridge circuit is constituted by four legs of which a first (A) and a second (B) nodes, that do not belong to a same leg, are connected to the two outputs of a differential drive amplifier (DRV) that performs impedance synthesis. A first leg is made of a first impedance matching network (Zm1) connected between the second node (B) and a third node (C). A second leg is made of a first primary winding (TP1) of a transformer and is connected between the third (C) and the first (A) nodes. A third leg is made of a second impedance matching network (Zm2) connected between the first node (A) and a fourth node (D). A forth leg is made of a second primary winding (TP2) of the transformer and is connected between the fourth (D) and second (B) nodes.

Abstract: The invention relates to a voltage generating circuit having: a voltage input (1); voltage boosting means (2), having an input (3) and an output (4); means (6) for varying the voltage supply level of the input to the said boosting means (2) from the said voltage input of the circuit, capable, on one hand, in a first state, of permitting the application, at the input to the said boosting means (2), of a fraction, that is possibly limited, of the voltage input to the circuit and, in a second state, of increasing the level of voltage applied to the said input to the boosting means (2) and, on the other hand, of permitting the change-over from the said first to the said second state according to a triggering signal, obtained by feedback of the output voltage from the said boosting means (2) to the said means (6) for varying the voltage level, so as to optimize the production at the output from the said boosting means (2) of a desired voltage level.

Abstract: The present invention is related to a Line driver for amplifying an input signal, said line driver comprising: a first input terminal (11) for receiving said input signal, a non-linear amplifier (3) connected to said input terminal (11) and arranged to provide a first output signal at a first output terminal (13), a digital to analogue converter (15) arranged to transform said input signal to an analogue input signal, an analogue linear amplifier (5) comprising a second (6) and a third input terminal (8) and a second output terminal (10), set up as a comparator between a first correction signal provided at said second input terminal (6) and a second correction signal provided at said third input terminal (8) and arranged to provide a second output signal at said second output terminal (10), combining means arranged to combine said first output signal and said second output signal to provide a total output signal to an output line (7), a first operational amplifier (12) configured to sense the current of said

Abstract: A hybrid circuit that couples a broadband modem to a POTS or ISDN telecommunication line (TL) and comprises a transformer bridge circuit (TBC) that includes a bridge circuit (BC). The bridge circuit is constituted by four legs of which a first (A) and a second (B) nodes, that do not belong to a same leg, are connected to the two outputs of a differential drive amplifier (DRV) that performs impedance synthesis. A first leg is made of a first impedance matching network (Zm1) connected between the second node (B) and a third node (C). A second leg is made of a first primary winding (TP1) of a transformer and is connected between the third (C) and the first (A) nodes. A third leg is made of a second impedance matching network (Zm2) connected between the first node (A) and a fourth node (D). A forth leg is made of a second primary winding (TP2) of the transformer and is connected between the fourth (D) and second (B) nodes.

Abstract: The present invention is related to a line driver for amplifying an input signal, said line driver comprising:

Abstract: The present invention is related to a Line driver for amplifying an input signal, said line driver comprising: a first input terminal (11) for receiving said input signal, a non-linear amplifier (3) connected to said input terminal (11) and arranged to provide a first output signal at a first output terminal (13), a digital to analogue converter (15) arranged to transform said input signal to an analogue input signal, an analogue linear amplifier (5) comprising a second (6) and a third input terminal (8) and a second output terminal (10), set up as a comparator between a first correction signal provided at said second input terminal (6) and a second correction signal provided at said third input terminal (8) and arranged to provide a second output signal at said second output terminal (10), combining means arranged to combine said first output signal and said second output signal to provide a total output signal to an output line (7), a first operational amplifier (12) configured to sense the current of said

Abstract: An interface arrangement including the cascade connection of a differential pre-amplifier (HPA1, HPA2) and a comparator (DA), and generally known as fast Low Voltage Differential Signal [LVDS] circuit for interfacing electronic chips. The current standards for such a LVDS circuit specify a minimum switching threshold voltage for the small differential input signal, while the common mode input signal varies over a very large range, both at a very high frequency. This is achieved owing to the fact that the differential pre-amplifier comprises a first (HPA1) and a second (HPA2) half pre-amplifier, each receiving the arrangement inputs (INN, INP) in an opposite way. Each half pre-amplifier (HPA1/HPA2) having first input inverter means (NN1, PN1) coupling an input (INN/INP) to an output (OUT1/OUT2) thereof, and second input inverter means (NP1, PM1, PM2; PP1, NM1, NM2) coupling the other input (INP/INN) to the output via current mirror means (PM1, PM2; NM1, NM2).