Design and Analysis of High Efficiency Line Drivers for xDSL by Tim Piessens

By Tim Piessens

Design and research of excessive potency Line Drivers for xDSL covers crucial development block of an xDSL (ADSL, VDSL, ...) approach: the road motive force. conventional type AB line drivers eat greater than 70% of the entire energy price range of cutting-edge ADSL modems. This ebook describes the most problems in designing line drivers for xDSL. crucial requirements are elaborated staring from the most houses of the channel and the sign homes. the normal (class AB), cutting-edge (class G) and destiny applied sciences (class okay) are discussed.

The major a part of layout and research of excessive potency Line Drivers for xDSL describes the layout of a unique structure: the Self-Oscillating strength Amplifier or SOPA.

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Crosstalk seemed to be inevitable. In 1881, Graham Bell came up with an easy but drastic solution to this problem : he invented the twisted pair. By twisting the wires, the disturbing signal becomes common mode to the wires and is in that way heavily suppressed. Although the twisting schemes4 evolved, present telephone wires are still built on the same principle. 3 The biggest improvement in the telephone exchanges before 1896 was the replacement of boy operators by girls. This not only reduced noise but improved switching speeds from 5 minutes to 20 seconds.

Also HDSL causes less cross-talk since it needs to transmit less power than T1/E1 transmission. HDSL’s benefits are mostly due to the elimination of mid-span repeaters. The total cost of a repeater is mostly formed by the cost during operation. A repeater failure means a field service visit. They are also mostly line powered; this requires a special line feed power supply at the CO. Most of the power fed by the CO power supply is wasted due to loop resistance. 048 M/s transport over telephone lines up to 12 kft.

This limit can be regarded as the maximal achievable bit-rate C T P through a channel. 14) in which BW is the channel’s bandwidth and S/N is the signal to noise ratio in the channel. 14: Spectrum of a DMT-modulated ADSL-signal This formula is calculated for the ADSL downstream (DS) band and the symmetrical and asymmetrical ETSI VDSL DS band plan. , 1999a]. For long loops the ADSL and VDSL bit-rates approach the maximal achievable Shannon limit. 1 Basic Properties xDSL uses DMT-modulation to reach these close-to-Shannon bit-rates.

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