Broadcom Corporation

Alcatel

Rudi Verbist

Raphael Paul Cassiers

Philippe Guillaume Dobbelaere

Jean-Philippe Robert Cornil

Francedillaois Jeanjean

The present invention relates to a transceiver for bidirectional frequency division multiplexed transmission. The transceiver comprises transmission means with a voltage source output or a current source output for transmitting data in a transmission frequency range, receiving means for receiving data in a receiving frequency range, and a coupling impedance for connecting the transmission means and the receiving means to a transmission medium. The magnitude of the coupling impedance in the transmission frequency range is smaller than the magnitude of the coupling impedance in the receiving frequency range if the transmission means has a voltage source output and is higher than the magnitude of the coupling impedance in the receiving frequency range if the transmission means has a current source output. Due to the reduced magnitude or increased magnitude respectively in the transmitting frequency range, the transmit signal power requirement is reduced.

Transceiver for bidirectional frequency division multiplexed transmission

The present invention relates to a transceiver for bidirectional frequency division multiplexed transmission, a communication system including one or more transceivers. Optionally, the communication system is a communication system for a digital subscriber line. The transceiver comprises transmission means with a voltage source output or a current source output for transmitting data in a transmission frequency range, receiving means for receiving data in a receiving frequency range, and a coupling impedance for connecting the transmission means and the receiving means to a transmission medium. The magnitude of the coupling impedance in the transmission frequency range is smaller than the magnitude of the coupling impedance in the receiving frequency range if the transmission means has a voltage source output and is higher than the magnitude of the coupling impedance in the receiving frequency range if the transmission means has a current source output. Due to the reduced magnitude or increased magnitude respectively in the transmitting frequency range, the transmit signal power requirement is reduced. In one variant of the invention, the magnitude of the coupling impedance is matched to the magnitude of the impedance of the transmission medium in order to increase the power of the received signals.

The invention refers to an electronic system, comprising several power-dissipating components, and a circuit board, wherein said power-dissipating components are mounted both to a top side and a bottom side of said circuit board. Further, the invention refers to method for mounting power-dissipating components onto a circuit board, comprising the steps of (a) determining the thermal behavior of said power-dissipating components; and (b) determining, in accordance thereto, the placement of said power-dissipating components on both a top side and a bottom side of said circuit board.

Thermally improved placement of power-dissipating components onto a circuit board

The present invention relates to a transceiver for bidirectional frequency division multiplexed transmission, a communication system including one or more transceivers. Optionally, the communication system is a communication system for a digital subscriber line. The transceiver comprises transmission means with a voltage source output or a current source output for transmitting data in a transmission frequency range, receiving means for receiving data in a receiving frequency range, and a coupling impedance for connecting the transmission means and the receiving means to a transmission medium. The magnitude of the coupling impedance in the transmission frequency range is smaller than the magnitude of the coupling impedance in the receiving frequency range if the transmission means has a voltage source output and is higher than the magnitude of the coupling impedance in the receiving frequency range if the transmission means has a current source output.

There is provided a circuit and method for providing a supply voltage to an operational amplifier. A switch has a plurality of inputs connected to a respective plurality of supply voltages. An output of the switch is connected to a supply voltage terminal of an operational amplifier. The input of the switch is selected in dependence of the voltage levels to which a signal is to be amplified

Switched supply for operational amplifier

There is provided a circuit and method for providing a supply voltage to an operational amplifier. A switch has a plurality of inputs connected to a respective plurality of supply voltages. An output of the switch is connected to a supply voltage terminal of an operational amplifier. The input of the switch is selected in dependence of the voltage levels to which a signal is to be amplified.

A differential output amplifier arrangement (DOA) including two operational amplifiers (OA1,OA2), each having a feedback resistor (R2,R20), and which are coupled by a first resistor (R1) between similar polarity type input terminals, further includes a pair of output resistors (R3,R30), coupled between respective output terminals (OUT1,OUT2), of each respective operational amplifier, and corresponding respective output terminals (ZOUT1,ZOUT2) of said arrangement, and a pair of resistors (R4,R40), each of which is cross-coupled between a respective output terminal of said arrangement (ZOUT1,ZOUT2) and one of the two similar polarity type, by the first resistor coupled, input terminals (INN2,INN1) of the respective cross-coupled operational amplifier. A method for adapting the output impedance of a differential output amplifier arrangement is described as well.

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Rudi Verbist