By Bert Serneels
This publication matches within the quest for hugely effective totally built-in xDSL modems for primary place of work functions. It provides a precis of analysis at one among Europe’s most famed analog layout learn teams over a 5 12 months interval. The ebook makes a speciality of the road motive force, the main hard construction block of the xDSL modem for decreasing energy. The e-book covers the whole layout stream of monolithic CMOS excessive voltage circuits. it really is crucial studying for analog layout engineers.
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Extra info for Design of High Voltage xDSL Line Drivers in Standard CMOS (Analog Circuits and Signal Processing)
21) N and CF respectively stands for the number of tones and the crest factor of the DMT signal. 19). 6 it can be concluded that a high MTPR value can be reached when the transformer ratio is increased, since the input signal level can be relaxed for high transformer ratios. 3 V SOPA system to achieve the same MTPR. The maximum achievable MTPR however, is a combination of the distortion and the noise energy σn2 at the output of the SOPA ampliﬁer. 2 V, of the SOPA system. The horizontal line shows the −100 dBm/Hz output noise speciﬁcation of an aDSL system.
Increasing the switching frequency results on the other hand in increasing switching losses. Therefore, the switching frequency must be carefully chosen in order to still gain in eﬃciency. 15. The problem is reduced to the generation of a triangular waveform. The block schematic of a self-oscillating class D ampliﬁer is shown in + − Fig. 15. 4 Solutions for xDSL Line Drivers 33 + − Comparator Digital buffer Loop filter Fig. 16. 16. In the same ﬁgure, the waveforms on the diﬀerent nodes are plotted.
5 Conclusions The big opportunity of DSL for last-mile Internet access is that it makes reuse of the billions of twisted pair wires in the ground. However, the unshielded telephone wires are far from ideal for high bit-rate applications. The most important telephone cable impairment is the large attenuation in function of frequency and distance. That is why DSL is a “real” last-mile access technology. However, DSL promises to turn copper into gold. By making use of DMT modulation techniques, data-rates close to the Shannon limit could be achieved.
Design of High Voltage xDSL Line Drivers in Standard CMOS (Analog Circuits and Signal Processing) by Bert Serneels